mirror of
https://git.sr.ht/~magic_rb/cluster
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2277 lines
104 KiB
Plaintext
2277 lines
104 KiB
Plaintext
# Redis configuration file example.
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#
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# Note that in order to read the configuration file, Redis must be
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# started with the file path as first argument:
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#
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# ./redis-server /path/to/redis.conf
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# Note on units: when memory size is needed, it is possible to specify
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# it in the usual form of 1k 5GB 4M and so forth:
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#
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# 1k => 1000 bytes
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# 1kb => 1024 bytes
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# 1m => 1000000 bytes
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# 1mb => 1024*1024 bytes
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# 1g => 1000000000 bytes
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# 1gb => 1024*1024*1024 bytes
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#
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# units are case insensitive so 1GB 1Gb 1gB are all the same.
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################################## INCLUDES ###################################
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# Include one or more other config files here. This is useful if you
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# have a standard template that goes to all Redis servers but also need
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# to customize a few per-server settings. Include files can include
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# other files, so use this wisely.
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#
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# Note that option "include" won't be rewritten by command "CONFIG REWRITE"
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# from admin or Redis Sentinel. Since Redis always uses the last processed
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# line as value of a configuration directive, you'd better put includes
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# at the beginning of this file to avoid overwriting config change at runtime.
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#
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# If instead you are interested in using includes to override configuration
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# options, it is better to use include as the last line.
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#
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# Included paths may contain wildcards. All files matching the wildcards will
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# be included in alphabetical order.
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# Note that if an include path contains a wildcards but no files match it when
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# the server is started, the include statement will be ignored and no error will
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# be emitted. It is safe, therefore, to include wildcard files from empty
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# directories.
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#
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# include /path/to/local.conf
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# include /path/to/other.conf
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# include /path/to/fragments/*.conf
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#
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################################## MODULES #####################################
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# Load modules at startup. If the server is not able to load modules
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# it will abort. It is possible to use multiple loadmodule directives.
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#
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# loadmodule /path/to/my_module.so
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# loadmodule /path/to/other_module.so
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################################## NETWORK #####################################
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# By default, if no "bind" configuration directive is specified, Redis listens
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# for connections from all available network interfaces on the host machine.
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# It is possible to listen to just one or multiple selected interfaces using
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# the "bind" configuration directive, followed by one or more IP addresses.
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# Each address can be prefixed by "-", which means that redis will not fail to
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# start if the address is not available. Being not available only refers to
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# addresses that does not correspond to any network interface. Addresses that
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# are already in use will always fail, and unsupported protocols will always BE
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# silently skipped.
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#
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# Examples:
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#
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# bind 192.168.1.100 10.0.0.1 # listens on two specific IPv4 addresses
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# bind 127.0.0.1 ::1 # listens on loopback IPv4 and IPv6
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# bind * -::* # like the default, all available interfaces
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#
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# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
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# internet, binding to all the interfaces is dangerous and will expose the
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# instance to everybody on the internet. So by default we uncomment the
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# following bind directive, that will force Redis to listen only on the
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# IPv4 and IPv6 (if available) loopback interface addresses (this means Redis
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# will only be able to accept client connections from the same host that it is
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# running on).
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#
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# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
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# COMMENT OUT THE FOLLOWING LINE.
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#
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# You will also need to set a password unless you explicitly disable protected
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# mode.
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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bind 127.0.0.1
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# By default, outgoing connections (from replica to master, from Sentinel to
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# instances, cluster bus, etc.) are not bound to a specific local address. In
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# most cases, this means the operating system will handle that based on routing
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# and the interface through which the connection goes out.
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#
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# Using bind-source-addr it is possible to configure a specific address to bind
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# to, which may also affect how the connection gets routed.
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#
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# Example:
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#
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# bind-source-addr 10.0.0.1
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# Protected mode is a layer of security protection, in order to avoid that
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# Redis instances left open on the internet are accessed and exploited.
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#
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# When protected mode is on and the default user has no password, the server
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# only accepts local connections from the IPv4 address (127.0.0.1), IPv6 address
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# (::1) or Unix domain sockets.
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#
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# By default protected mode is enabled. You should disable it only if
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# you are sure you want clients from other hosts to connect to Redis
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# even if no authentication is configured.
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protected-mode yes
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# Redis uses default hardened security configuration directives to reduce the
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# attack surface on innocent users. Therefore, several sensitive configuration
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# directives are immutable, and some potentially-dangerous commands are blocked.
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#
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# Configuration directives that control files that Redis writes to (e.g., 'dir'
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# and 'dbfilename') and that aren't usually modified during runtime
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# are protected by making them immutable.
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#
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# Commands that can increase the attack surface of Redis and that aren't usually
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# called by users are blocked by default.
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#
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# These can be exposed to either all connections or just local ones by setting
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# each of the configs listed below to either of these values:
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#
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# no - Block for any connection (remain immutable)
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# yes - Allow for any connection (no protection)
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# local - Allow only for local connections. Ones originating from the
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# IPv4 address (127.0.0.1), IPv6 address (::1) or Unix domain sockets.
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#
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# enable-protected-configs no
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# enable-debug-command no
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# enable-module-command no
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# Accept connections on the specified port, default is 6379 (IANA #815344).
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# If port 0 is specified Redis will not listen on a TCP socket.
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port 6379
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# TCP listen() backlog.
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#
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# In high requests-per-second environments you need a high backlog in order
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# to avoid slow clients connection issues. Note that the Linux kernel
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# will silently truncate it to the value of /proc/sys/net/core/somaxconn so
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# make sure to raise both the value of somaxconn and tcp_max_syn_backlog
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# in order to get the desired effect.
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tcp-backlog 511
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# Unix socket.
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#
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# Specify the path for the Unix socket that will be used to listen for
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# incoming connections. There is no default, so Redis will not listen
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# on a unix socket when not specified.
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#
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# unixsocket /run/redis.sock
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# unixsocketperm 700
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# Close the connection after a client is idle for N seconds (0 to disable)
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timeout 0
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# TCP keepalive.
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#
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# If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence
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# of communication. This is useful for two reasons:
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#
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# 1) Detect dead peers.
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# 2) Force network equipment in the middle to consider the connection to be
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# alive.
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#
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# On Linux, the specified value (in seconds) is the period used to send ACKs.
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# Note that to close the connection the double of the time is needed.
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# On other kernels the period depends on the kernel configuration.
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#
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# A reasonable value for this option is 300 seconds, which is the new
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# Redis default starting with Redis 3.2.1.
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tcp-keepalive 300
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# Apply OS-specific mechanism to mark the listening socket with the specified
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# ID, to support advanced routing and filtering capabilities.
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#
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# On Linux, the ID represents a connection mark.
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# On FreeBSD, the ID represents a socket cookie ID.
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# On OpenBSD, the ID represents a route table ID.
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#
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# The default value is 0, which implies no marking is required.
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# socket-mark-id 0
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################################# TLS/SSL #####################################
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# By default, TLS/SSL is disabled. To enable it, the "tls-port" configuration
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# directive can be used to define TLS-listening ports. To enable TLS on the
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# default port, use:
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#
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# port 0
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# tls-port 6379
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# Configure a X.509 certificate and private key to use for authenticating the
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# server to connected clients, masters or cluster peers. These files should be
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# PEM formatted.
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#
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# tls-cert-file redis.crt
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# tls-key-file redis.key
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#
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# If the key file is encrypted using a passphrase, it can be included here
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# as well.
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#
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# tls-key-file-pass secret
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# Normally Redis uses the same certificate for both server functions (accepting
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# connections) and client functions (replicating from a master, establishing
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# cluster bus connections, etc.).
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#
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# Sometimes certificates are issued with attributes that designate them as
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# client-only or server-only certificates. In that case it may be desired to use
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# different certificates for incoming (server) and outgoing (client)
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# connections. To do that, use the following directives:
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#
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# tls-client-cert-file client.crt
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# tls-client-key-file client.key
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#
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# If the key file is encrypted using a passphrase, it can be included here
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# as well.
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#
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# tls-client-key-file-pass secret
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# Configure a DH parameters file to enable Diffie-Hellman (DH) key exchange,
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# required by older versions of OpenSSL (<3.0). Newer versions do not require
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# this configuration and recommend against it.
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#
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# tls-dh-params-file redis.dh
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# Configure a CA certificate(s) bundle or directory to authenticate TLS/SSL
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# clients and peers. Redis requires an explicit configuration of at least one
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# of these, and will not implicitly use the system wide configuration.
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#
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# tls-ca-cert-file ca.crt
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# tls-ca-cert-dir /etc/ssl/certs
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# By default, clients (including replica servers) on a TLS port are required
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# to authenticate using valid client side certificates.
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#
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# If "no" is specified, client certificates are not required and not accepted.
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# If "optional" is specified, client certificates are accepted and must be
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# valid if provided, but are not required.
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#
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# tls-auth-clients no
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# tls-auth-clients optional
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# By default, a Redis replica does not attempt to establish a TLS connection
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# with its master.
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#
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# Use the following directive to enable TLS on replication links.
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#
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# tls-replication yes
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# By default, the Redis Cluster bus uses a plain TCP connection. To enable
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# TLS for the bus protocol, use the following directive:
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#
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# tls-cluster yes
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# By default, only TLSv1.2 and TLSv1.3 are enabled and it is highly recommended
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# that older formally deprecated versions are kept disabled to reduce the attack surface.
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# You can explicitly specify TLS versions to support.
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# Allowed values are case insensitive and include "TLSv1", "TLSv1.1", "TLSv1.2",
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# "TLSv1.3" (OpenSSL >= 1.1.1) or any combination.
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# To enable only TLSv1.2 and TLSv1.3, use:
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#
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# tls-protocols "TLSv1.2 TLSv1.3"
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# Configure allowed ciphers. See the ciphers(1ssl) manpage for more information
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# about the syntax of this string.
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#
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# Note: this configuration applies only to <= TLSv1.2.
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#
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# tls-ciphers DEFAULT:!MEDIUM
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# Configure allowed TLSv1.3 ciphersuites. See the ciphers(1ssl) manpage for more
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# information about the syntax of this string, and specifically for TLSv1.3
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# ciphersuites.
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#
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# tls-ciphersuites TLS_CHACHA20_POLY1305_SHA256
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# When choosing a cipher, use the server's preference instead of the client
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# preference. By default, the server follows the client's preference.
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#
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# tls-prefer-server-ciphers yes
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# By default, TLS session caching is enabled to allow faster and less expensive
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# reconnections by clients that support it. Use the following directive to disable
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# caching.
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#
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# tls-session-caching no
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# Change the default number of TLS sessions cached. A zero value sets the cache
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# to unlimited size. The default size is 20480.
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#
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# tls-session-cache-size 5000
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# Change the default timeout of cached TLS sessions. The default timeout is 300
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# seconds.
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#
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# tls-session-cache-timeout 60
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################################# GENERAL #####################################
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# By default Redis does not run as a daemon. Use 'yes' if you need it.
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# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
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# When Redis is supervised by upstart or systemd, this parameter has no impact.
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daemonize no
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# If you run Redis from upstart or systemd, Redis can interact with your
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# supervision tree. Options:
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# supervised no - no supervision interaction
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# supervised upstart - signal upstart by putting Redis into SIGSTOP mode
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# requires "expect stop" in your upstart job config
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# supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET
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# on startup, and updating Redis status on a regular
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# basis.
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# supervised auto - detect upstart or systemd method based on
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# UPSTART_JOB or NOTIFY_SOCKET environment variables
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# Note: these supervision methods only signal "process is ready."
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# They do not enable continuous pings back to your supervisor.
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#
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# The default is "no". To run under upstart/systemd, you can simply uncomment
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# the line below:
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#
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# supervised auto
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# If a pid file is specified, Redis writes it where specified at startup
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# and removes it at exit.
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#
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# When the server runs non daemonized, no pid file is created if none is
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# specified in the configuration. When the server is daemonized, the pid file
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# is used even if not specified, defaulting to "/var/run/redis.pid".
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#
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# Creating a pid file is best effort: if Redis is not able to create it
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# nothing bad happens, the server will start and run normally.
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#
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# Note that on modern Linux systems "/run/redis.pid" is more conforming
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# and should be used instead.
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pidfile /var/run/redis_6379.pid
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# Specify the server verbosity level.
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# This can be one of:
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# debug (a lot of information, useful for development/testing)
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# verbose (many rarely useful info, but not a mess like the debug level)
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# notice (moderately verbose, what you want in production probably)
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# warning (only very important / critical messages are logged)
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loglevel notice
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# Specify the log file name. Also the empty string can be used to force
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# Redis to log on the standard output. Note that if you use standard
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# output for logging but daemonize, logs will be sent to /dev/null
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logfile ""
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# To enable logging to the system logger, just set 'syslog-enabled' to yes,
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# and optionally update the other syslog parameters to suit your needs.
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# syslog-enabled no
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# Specify the syslog identity.
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# syslog-ident redis
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# Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
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# syslog-facility local0
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# To disable the built in crash log, which will possibly produce cleaner core
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# dumps when they are needed, uncomment the following:
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#
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# crash-log-enabled no
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# To disable the fast memory check that's run as part of the crash log, which
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# will possibly let redis terminate sooner, uncomment the following:
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#
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# crash-memcheck-enabled no
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# Set the number of databases. The default database is DB 0, you can select
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# a different one on a per-connection basis using SELECT <dbid> where
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# dbid is a number between 0 and 'databases'-1
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databases 16
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# By default Redis shows an ASCII art logo only when started to log to the
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# standard output and if the standard output is a TTY and syslog logging is
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# disabled. Basically this means that normally a logo is displayed only in
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# interactive sessions.
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#
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# However it is possible to force the pre-4.0 behavior and always show a
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# ASCII art logo in startup logs by setting the following option to yes.
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always-show-logo no
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# By default, Redis modifies the process title (as seen in 'top' and 'ps') to
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# provide some runtime information. It is possible to disable this and leave
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# the process name as executed by setting the following to no.
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set-proc-title yes
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# When changing the process title, Redis uses the following template to construct
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# the modified title.
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#
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# Template variables are specified in curly brackets. The following variables are
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# supported:
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#
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# {title} Name of process as executed if parent, or type of child process.
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# {listen-addr} Bind address or '*' followed by TCP or TLS port listening on, or
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# Unix socket if only that's available.
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# {server-mode} Special mode, i.e. "[sentinel]" or "[cluster]".
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# {port} TCP port listening on, or 0.
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# {tls-port} TLS port listening on, or 0.
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# {unixsocket} Unix domain socket listening on, or "".
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# {config-file} Name of configuration file used.
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#
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proc-title-template "{title} {listen-addr} {server-mode}"
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################################ SNAPSHOTTING ################################
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# Save the DB to disk.
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#
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# save <seconds> <changes> [<seconds> <changes> ...]
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#
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# Redis will save the DB if the given number of seconds elapsed and it
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# surpassed the given number of write operations against the DB.
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#
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# Snapshotting can be completely disabled with a single empty string argument
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# as in following example:
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#
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# save ""
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#
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# Unless specified otherwise, by default Redis will save the DB:
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# * After 3600 seconds (an hour) if at least 1 change was performed
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# * After 300 seconds (5 minutes) if at least 100 changes were performed
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# * After 60 seconds if at least 10000 changes were performed
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#
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# You can set these explicitly by uncommenting the following line.
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#
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# save 3600 1 300 100 60 10000
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# By default Redis will stop accepting writes if RDB snapshots are enabled
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# (at least one save point) and the latest background save failed.
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# This will make the user aware (in a hard way) that data is not persisting
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# on disk properly, otherwise chances are that no one will notice and some
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# disaster will happen.
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#
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# If the background saving process will start working again Redis will
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# automatically allow writes again.
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#
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# However if you have setup your proper monitoring of the Redis server
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# and persistence, you may want to disable this feature so that Redis will
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# continue to work as usual even if there are problems with disk,
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# permissions, and so forth.
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stop-writes-on-bgsave-error yes
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# Compress string objects using LZF when dump .rdb databases?
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# By default compression is enabled as it's almost always a win.
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# If you want to save some CPU in the saving child set it to 'no' but
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# the dataset will likely be bigger if you have compressible values or keys.
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rdbcompression yes
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# Since version 5 of RDB a CRC64 checksum is placed at the end of the file.
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# This makes the format more resistant to corruption but there is a performance
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# hit to pay (around 10%) when saving and loading RDB files, so you can disable it
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# for maximum performances.
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#
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# RDB files created with checksum disabled have a checksum of zero that will
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# tell the loading code to skip the check.
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rdbchecksum yes
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# Enables or disables full sanitization checks for ziplist and listpack etc when
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# loading an RDB or RESTORE payload. This reduces the chances of a assertion or
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# crash later on while processing commands.
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# Options:
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# no - Never perform full sanitization
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# yes - Always perform full sanitization
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# clients - Perform full sanitization only for user connections.
|
|
# Excludes: RDB files, RESTORE commands received from the master
|
|
# connection, and client connections which have the
|
|
# skip-sanitize-payload ACL flag.
|
|
# The default should be 'clients' but since it currently affects cluster
|
|
# resharding via MIGRATE, it is temporarily set to 'no' by default.
|
|
#
|
|
# sanitize-dump-payload no
|
|
|
|
# The filename where to dump the DB
|
|
dbfilename dump.rdb
|
|
|
|
# Remove RDB files used by replication in instances without persistence
|
|
# enabled. By default this option is disabled, however there are environments
|
|
# where for regulations or other security concerns, RDB files persisted on
|
|
# disk by masters in order to feed replicas, or stored on disk by replicas
|
|
# in order to load them for the initial synchronization, should be deleted
|
|
# ASAP. Note that this option ONLY WORKS in instances that have both AOF
|
|
# and RDB persistence disabled, otherwise is completely ignored.
|
|
#
|
|
# An alternative (and sometimes better) way to obtain the same effect is
|
|
# to use diskless replication on both master and replicas instances. However
|
|
# in the case of replicas, diskless is not always an option.
|
|
rdb-del-sync-files no
|
|
|
|
# The working directory.
|
|
#
|
|
# The DB will be written inside this directory, with the filename specified
|
|
# above using the 'dbfilename' configuration directive.
|
|
#
|
|
# The Append Only File will also be created inside this directory.
|
|
#
|
|
# Note that you must specify a directory here, not a file name.
|
|
dir ./
|
|
|
|
################################# REPLICATION #################################
|
|
|
|
# Master-Replica replication. Use replicaof to make a Redis instance a copy of
|
|
# another Redis server. A few things to understand ASAP about Redis replication.
|
|
#
|
|
# +------------------+ +---------------+
|
|
# | Master | ---> | Replica |
|
|
# | (receive writes) | | (exact copy) |
|
|
# +------------------+ +---------------+
|
|
#
|
|
# 1) Redis replication is asynchronous, but you can configure a master to
|
|
# stop accepting writes if it appears to be not connected with at least
|
|
# a given number of replicas.
|
|
# 2) Redis replicas are able to perform a partial resynchronization with the
|
|
# master if the replication link is lost for a relatively small amount of
|
|
# time. You may want to configure the replication backlog size (see the next
|
|
# sections of this file) with a sensible value depending on your needs.
|
|
# 3) Replication is automatic and does not need user intervention. After a
|
|
# network partition replicas automatically try to reconnect to masters
|
|
# and resynchronize with them.
|
|
#
|
|
# replicaof <masterip> <masterport>
|
|
|
|
# If the master is password protected (using the "requirepass" configuration
|
|
# directive below) it is possible to tell the replica to authenticate before
|
|
# starting the replication synchronization process, otherwise the master will
|
|
# refuse the replica request.
|
|
#
|
|
# masterauth <master-password>
|
|
#
|
|
# However this is not enough if you are using Redis ACLs (for Redis version
|
|
# 6 or greater), and the default user is not capable of running the PSYNC
|
|
# command and/or other commands needed for replication. In this case it's
|
|
# better to configure a special user to use with replication, and specify the
|
|
# masteruser configuration as such:
|
|
#
|
|
# masteruser <username>
|
|
#
|
|
# When masteruser is specified, the replica will authenticate against its
|
|
# master using the new AUTH form: AUTH <username> <password>.
|
|
|
|
# When a replica loses its connection with the master, or when the replication
|
|
# is still in progress, the replica can act in two different ways:
|
|
#
|
|
# 1) if replica-serve-stale-data is set to 'yes' (the default) the replica will
|
|
# still reply to client requests, possibly with out of date data, or the
|
|
# data set may just be empty if this is the first synchronization.
|
|
#
|
|
# 2) If replica-serve-stale-data is set to 'no' the replica will reply with error
|
|
# "MASTERDOWN Link with MASTER is down and replica-serve-stale-data is set to 'no'"
|
|
# to all data access commands, excluding commands such as:
|
|
# INFO, REPLICAOF, AUTH, SHUTDOWN, REPLCONF, ROLE, CONFIG, SUBSCRIBE,
|
|
# UNSUBSCRIBE, PSUBSCRIBE, PUNSUBSCRIBE, PUBLISH, PUBSUB, COMMAND, POST,
|
|
# HOST and LATENCY.
|
|
#
|
|
replica-serve-stale-data yes
|
|
|
|
# You can configure a replica instance to accept writes or not. Writing against
|
|
# a replica instance may be useful to store some ephemeral data (because data
|
|
# written on a replica will be easily deleted after resync with the master) but
|
|
# may also cause problems if clients are writing to it because of a
|
|
# misconfiguration.
|
|
#
|
|
# Since Redis 2.6 by default replicas are read-only.
|
|
#
|
|
# Note: read only replicas are not designed to be exposed to untrusted clients
|
|
# on the internet. It's just a protection layer against misuse of the instance.
|
|
# Still a read only replica exports by default all the administrative commands
|
|
# such as CONFIG, DEBUG, and so forth. To a limited extent you can improve
|
|
# security of read only replicas using 'rename-command' to shadow all the
|
|
# administrative / dangerous commands.
|
|
replica-read-only yes
|
|
|
|
# Replication SYNC strategy: disk or socket.
|
|
#
|
|
# New replicas and reconnecting replicas that are not able to continue the
|
|
# replication process just receiving differences, need to do what is called a
|
|
# "full synchronization". An RDB file is transmitted from the master to the
|
|
# replicas.
|
|
#
|
|
# The transmission can happen in two different ways:
|
|
#
|
|
# 1) Disk-backed: The Redis master creates a new process that writes the RDB
|
|
# file on disk. Later the file is transferred by the parent
|
|
# process to the replicas incrementally.
|
|
# 2) Diskless: The Redis master creates a new process that directly writes the
|
|
# RDB file to replica sockets, without touching the disk at all.
|
|
#
|
|
# With disk-backed replication, while the RDB file is generated, more replicas
|
|
# can be queued and served with the RDB file as soon as the current child
|
|
# producing the RDB file finishes its work. With diskless replication instead
|
|
# once the transfer starts, new replicas arriving will be queued and a new
|
|
# transfer will start when the current one terminates.
|
|
#
|
|
# When diskless replication is used, the master waits a configurable amount of
|
|
# time (in seconds) before starting the transfer in the hope that multiple
|
|
# replicas will arrive and the transfer can be parallelized.
|
|
#
|
|
# With slow disks and fast (large bandwidth) networks, diskless replication
|
|
# works better.
|
|
repl-diskless-sync yes
|
|
|
|
# When diskless replication is enabled, it is possible to configure the delay
|
|
# the server waits in order to spawn the child that transfers the RDB via socket
|
|
# to the replicas.
|
|
#
|
|
# This is important since once the transfer starts, it is not possible to serve
|
|
# new replicas arriving, that will be queued for the next RDB transfer, so the
|
|
# server waits a delay in order to let more replicas arrive.
|
|
#
|
|
# The delay is specified in seconds, and by default is 5 seconds. To disable
|
|
# it entirely just set it to 0 seconds and the transfer will start ASAP.
|
|
repl-diskless-sync-delay 5
|
|
|
|
# When diskless replication is enabled with a delay, it is possible to let
|
|
# the replication start before the maximum delay is reached if the maximum
|
|
# number of replicas expected have connected. Default of 0 means that the
|
|
# maximum is not defined and Redis will wait the full delay.
|
|
repl-diskless-sync-max-replicas 0
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# WARNING: RDB diskless load is experimental. Since in this setup the replica
|
|
# does not immediately store an RDB on disk, it may cause data loss during
|
|
# failovers. RDB diskless load + Redis modules not handling I/O reads may also
|
|
# cause Redis to abort in case of I/O errors during the initial synchronization
|
|
# stage with the master. Use only if you know what you are doing.
|
|
# -----------------------------------------------------------------------------
|
|
#
|
|
# Replica can load the RDB it reads from the replication link directly from the
|
|
# socket, or store the RDB to a file and read that file after it was completely
|
|
# received from the master.
|
|
#
|
|
# In many cases the disk is slower than the network, and storing and loading
|
|
# the RDB file may increase replication time (and even increase the master's
|
|
# Copy on Write memory and replica buffers).
|
|
# However, parsing the RDB file directly from the socket may mean that we have
|
|
# to flush the contents of the current database before the full rdb was
|
|
# received. For this reason we have the following options:
|
|
#
|
|
# "disabled" - Don't use diskless load (store the rdb file to the disk first)
|
|
# "on-empty-db" - Use diskless load only when it is completely safe.
|
|
# "swapdb" - Keep current db contents in RAM while parsing the data directly
|
|
# from the socket. Replicas in this mode can keep serving current
|
|
# data set while replication is in progress, except for cases where
|
|
# they can't recognize master as having a data set from same
|
|
# replication history.
|
|
# Note that this requires sufficient memory, if you don't have it,
|
|
# you risk an OOM kill.
|
|
repl-diskless-load disabled
|
|
|
|
# Master send PINGs to its replicas in a predefined interval. It's possible to
|
|
# change this interval with the repl_ping_replica_period option. The default
|
|
# value is 10 seconds.
|
|
#
|
|
# repl-ping-replica-period 10
|
|
|
|
# The following option sets the replication timeout for:
|
|
#
|
|
# 1) Bulk transfer I/O during SYNC, from the point of view of replica.
|
|
# 2) Master timeout from the point of view of replicas (data, pings).
|
|
# 3) Replica timeout from the point of view of masters (REPLCONF ACK pings).
|
|
#
|
|
# It is important to make sure that this value is greater than the value
|
|
# specified for repl-ping-replica-period otherwise a timeout will be detected
|
|
# every time there is low traffic between the master and the replica. The default
|
|
# value is 60 seconds.
|
|
#
|
|
# repl-timeout 60
|
|
|
|
# Disable TCP_NODELAY on the replica socket after SYNC?
|
|
#
|
|
# If you select "yes" Redis will use a smaller number of TCP packets and
|
|
# less bandwidth to send data to replicas. But this can add a delay for
|
|
# the data to appear on the replica side, up to 40 milliseconds with
|
|
# Linux kernels using a default configuration.
|
|
#
|
|
# If you select "no" the delay for data to appear on the replica side will
|
|
# be reduced but more bandwidth will be used for replication.
|
|
#
|
|
# By default we optimize for low latency, but in very high traffic conditions
|
|
# or when the master and replicas are many hops away, turning this to "yes" may
|
|
# be a good idea.
|
|
repl-disable-tcp-nodelay no
|
|
|
|
# Set the replication backlog size. The backlog is a buffer that accumulates
|
|
# replica data when replicas are disconnected for some time, so that when a
|
|
# replica wants to reconnect again, often a full resync is not needed, but a
|
|
# partial resync is enough, just passing the portion of data the replica
|
|
# missed while disconnected.
|
|
#
|
|
# The bigger the replication backlog, the longer the replica can endure the
|
|
# disconnect and later be able to perform a partial resynchronization.
|
|
#
|
|
# The backlog is only allocated if there is at least one replica connected.
|
|
#
|
|
# repl-backlog-size 1mb
|
|
|
|
# After a master has no connected replicas for some time, the backlog will be
|
|
# freed. The following option configures the amount of seconds that need to
|
|
# elapse, starting from the time the last replica disconnected, for the backlog
|
|
# buffer to be freed.
|
|
#
|
|
# Note that replicas never free the backlog for timeout, since they may be
|
|
# promoted to masters later, and should be able to correctly "partially
|
|
# resynchronize" with other replicas: hence they should always accumulate backlog.
|
|
#
|
|
# A value of 0 means to never release the backlog.
|
|
#
|
|
# repl-backlog-ttl 3600
|
|
|
|
# The replica priority is an integer number published by Redis in the INFO
|
|
# output. It is used by Redis Sentinel in order to select a replica to promote
|
|
# into a master if the master is no longer working correctly.
|
|
#
|
|
# A replica with a low priority number is considered better for promotion, so
|
|
# for instance if there are three replicas with priority 10, 100, 25 Sentinel
|
|
# will pick the one with priority 10, that is the lowest.
|
|
#
|
|
# However a special priority of 0 marks the replica as not able to perform the
|
|
# role of master, so a replica with priority of 0 will never be selected by
|
|
# Redis Sentinel for promotion.
|
|
#
|
|
# By default the priority is 100.
|
|
replica-priority 100
|
|
|
|
# The propagation error behavior controls how Redis will behave when it is
|
|
# unable to handle a command being processed in the replication stream from a master
|
|
# or processed while reading from an AOF file. Errors that occur during propagation
|
|
# are unexpected, and can cause data inconsistency. However, there are edge cases
|
|
# in earlier versions of Redis where it was possible for the server to replicate or persist
|
|
# commands that would fail on future versions. For this reason the default behavior
|
|
# is to ignore such errors and continue processing commands.
|
|
#
|
|
# If an application wants to ensure there is no data divergence, this configuration
|
|
# should be set to 'panic' instead. The value can also be set to 'panic-on-replicas'
|
|
# to only panic when a replica encounters an error on the replication stream. One of
|
|
# these two panic values will become the default value in the future once there are
|
|
# sufficient safety mechanisms in place to prevent false positive crashes.
|
|
#
|
|
# propagation-error-behavior ignore
|
|
|
|
# Replica ignore disk write errors controls the behavior of a replica when it is
|
|
# unable to persist a write command received from its master to disk. By default,
|
|
# this configuration is set to 'no' and will crash the replica in this condition.
|
|
# It is not recommended to change this default, however in order to be compatible
|
|
# with older versions of Redis this config can be toggled to 'yes' which will just
|
|
# log a warning and execute the write command it got from the master.
|
|
#
|
|
# replica-ignore-disk-write-errors no
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# By default, Redis Sentinel includes all replicas in its reports. A replica
|
|
# can be excluded from Redis Sentinel's announcements. An unannounced replica
|
|
# will be ignored by the 'sentinel replicas <master>' command and won't be
|
|
# exposed to Redis Sentinel's clients.
|
|
#
|
|
# This option does not change the behavior of replica-priority. Even with
|
|
# replica-announced set to 'no', the replica can be promoted to master. To
|
|
# prevent this behavior, set replica-priority to 0.
|
|
#
|
|
# replica-announced yes
|
|
|
|
# It is possible for a master to stop accepting writes if there are less than
|
|
# N replicas connected, having a lag less or equal than M seconds.
|
|
#
|
|
# The N replicas need to be in "online" state.
|
|
#
|
|
# The lag in seconds, that must be <= the specified value, is calculated from
|
|
# the last ping received from the replica, that is usually sent every second.
|
|
#
|
|
# This option does not GUARANTEE that N replicas will accept the write, but
|
|
# will limit the window of exposure for lost writes in case not enough replicas
|
|
# are available, to the specified number of seconds.
|
|
#
|
|
# For example to require at least 3 replicas with a lag <= 10 seconds use:
|
|
#
|
|
# min-replicas-to-write 3
|
|
# min-replicas-max-lag 10
|
|
#
|
|
# Setting one or the other to 0 disables the feature.
|
|
#
|
|
# By default min-replicas-to-write is set to 0 (feature disabled) and
|
|
# min-replicas-max-lag is set to 10.
|
|
|
|
# A Redis master is able to list the address and port of the attached
|
|
# replicas in different ways. For example the "INFO replication" section
|
|
# offers this information, which is used, among other tools, by
|
|
# Redis Sentinel in order to discover replica instances.
|
|
# Another place where this info is available is in the output of the
|
|
# "ROLE" command of a master.
|
|
#
|
|
# The listed IP address and port normally reported by a replica is
|
|
# obtained in the following way:
|
|
#
|
|
# IP: The address is auto detected by checking the peer address
|
|
# of the socket used by the replica to connect with the master.
|
|
#
|
|
# Port: The port is communicated by the replica during the replication
|
|
# handshake, and is normally the port that the replica is using to
|
|
# listen for connections.
|
|
#
|
|
# However when port forwarding or Network Address Translation (NAT) is
|
|
# used, the replica may actually be reachable via different IP and port
|
|
# pairs. The following two options can be used by a replica in order to
|
|
# report to its master a specific set of IP and port, so that both INFO
|
|
# and ROLE will report those values.
|
|
#
|
|
# There is no need to use both the options if you need to override just
|
|
# the port or the IP address.
|
|
#
|
|
# replica-announce-ip 5.5.5.5
|
|
# replica-announce-port 1234
|
|
|
|
############################### KEYS TRACKING #################################
|
|
|
|
# Redis implements server assisted support for client side caching of values.
|
|
# This is implemented using an invalidation table that remembers, using
|
|
# a radix key indexed by key name, what clients have which keys. In turn
|
|
# this is used in order to send invalidation messages to clients. Please
|
|
# check this page to understand more about the feature:
|
|
#
|
|
# https://redis.io/topics/client-side-caching
|
|
#
|
|
# When tracking is enabled for a client, all the read only queries are assumed
|
|
# to be cached: this will force Redis to store information in the invalidation
|
|
# table. When keys are modified, such information is flushed away, and
|
|
# invalidation messages are sent to the clients. However if the workload is
|
|
# heavily dominated by reads, Redis could use more and more memory in order
|
|
# to track the keys fetched by many clients.
|
|
#
|
|
# For this reason it is possible to configure a maximum fill value for the
|
|
# invalidation table. By default it is set to 1M of keys, and once this limit
|
|
# is reached, Redis will start to evict keys in the invalidation table
|
|
# even if they were not modified, just to reclaim memory: this will in turn
|
|
# force the clients to invalidate the cached values. Basically the table
|
|
# maximum size is a trade off between the memory you want to spend server
|
|
# side to track information about who cached what, and the ability of clients
|
|
# to retain cached objects in memory.
|
|
#
|
|
# If you set the value to 0, it means there are no limits, and Redis will
|
|
# retain as many keys as needed in the invalidation table.
|
|
# In the "stats" INFO section, you can find information about the number of
|
|
# keys in the invalidation table at every given moment.
|
|
#
|
|
# Note: when key tracking is used in broadcasting mode, no memory is used
|
|
# in the server side so this setting is useless.
|
|
#
|
|
# tracking-table-max-keys 1000000
|
|
|
|
################################## SECURITY ###################################
|
|
|
|
# Warning: since Redis is pretty fast, an outside user can try up to
|
|
# 1 million passwords per second against a modern box. This means that you
|
|
# should use very strong passwords, otherwise they will be very easy to break.
|
|
# Note that because the password is really a shared secret between the client
|
|
# and the server, and should not be memorized by any human, the password
|
|
# can be easily a long string from /dev/urandom or whatever, so by using a
|
|
# long and unguessable password no brute force attack will be possible.
|
|
|
|
# Redis ACL users are defined in the following format:
|
|
#
|
|
# user <username> ... acl rules ...
|
|
#
|
|
# For example:
|
|
#
|
|
# user worker +@list +@connection ~jobs:* on >ffa9203c493aa99
|
|
#
|
|
# The special username "default" is used for new connections. If this user
|
|
# has the "nopass" rule, then new connections will be immediately authenticated
|
|
# as the "default" user without the need of any password provided via the
|
|
# AUTH command. Otherwise if the "default" user is not flagged with "nopass"
|
|
# the connections will start in not authenticated state, and will require
|
|
# AUTH (or the HELLO command AUTH option) in order to be authenticated and
|
|
# start to work.
|
|
#
|
|
# The ACL rules that describe what a user can do are the following:
|
|
#
|
|
# on Enable the user: it is possible to authenticate as this user.
|
|
# off Disable the user: it's no longer possible to authenticate
|
|
# with this user, however the already authenticated connections
|
|
# will still work.
|
|
# skip-sanitize-payload RESTORE dump-payload sanitization is skipped.
|
|
# sanitize-payload RESTORE dump-payload is sanitized (default).
|
|
# +<command> Allow the execution of that command.
|
|
# May be used with `|` for allowing subcommands (e.g "+config|get")
|
|
# -<command> Disallow the execution of that command.
|
|
# May be used with `|` for blocking subcommands (e.g "-config|set")
|
|
# +@<category> Allow the execution of all the commands in such category
|
|
# with valid categories are like @admin, @set, @sortedset, ...
|
|
# and so forth, see the full list in the server.c file where
|
|
# the Redis command table is described and defined.
|
|
# The special category @all means all the commands, but currently
|
|
# present in the server, and that will be loaded in the future
|
|
# via modules.
|
|
# +<command>|first-arg Allow a specific first argument of an otherwise
|
|
# disabled command. It is only supported on commands with
|
|
# no sub-commands, and is not allowed as negative form
|
|
# like -SELECT|1, only additive starting with "+". This
|
|
# feature is deprecated and may be removed in the future.
|
|
# allcommands Alias for +@all. Note that it implies the ability to execute
|
|
# all the future commands loaded via the modules system.
|
|
# nocommands Alias for -@all.
|
|
# ~<pattern> Add a pattern of keys that can be mentioned as part of
|
|
# commands. For instance ~* allows all the keys. The pattern
|
|
# is a glob-style pattern like the one of KEYS.
|
|
# It is possible to specify multiple patterns.
|
|
# %R~<pattern> Add key read pattern that specifies which keys can be read
|
|
# from.
|
|
# %W~<pattern> Add key write pattern that specifies which keys can be
|
|
# written to.
|
|
# allkeys Alias for ~*
|
|
# resetkeys Flush the list of allowed keys patterns.
|
|
# &<pattern> Add a glob-style pattern of Pub/Sub channels that can be
|
|
# accessed by the user. It is possible to specify multiple channel
|
|
# patterns.
|
|
# allchannels Alias for &*
|
|
# resetchannels Flush the list of allowed channel patterns.
|
|
# ><password> Add this password to the list of valid password for the user.
|
|
# For example >mypass will add "mypass" to the list.
|
|
# This directive clears the "nopass" flag (see later).
|
|
# <<password> Remove this password from the list of valid passwords.
|
|
# nopass All the set passwords of the user are removed, and the user
|
|
# is flagged as requiring no password: it means that every
|
|
# password will work against this user. If this directive is
|
|
# used for the default user, every new connection will be
|
|
# immediately authenticated with the default user without
|
|
# any explicit AUTH command required. Note that the "resetpass"
|
|
# directive will clear this condition.
|
|
# resetpass Flush the list of allowed passwords. Moreover removes the
|
|
# "nopass" status. After "resetpass" the user has no associated
|
|
# passwords and there is no way to authenticate without adding
|
|
# some password (or setting it as "nopass" later).
|
|
# reset Performs the following actions: resetpass, resetkeys, off,
|
|
# -@all. The user returns to the same state it has immediately
|
|
# after its creation.
|
|
# (<options>) Create a new selector with the options specified within the
|
|
# parentheses and attach it to the user. Each option should be
|
|
# space separated. The first character must be ( and the last
|
|
# character must be ).
|
|
# clearselectors Remove all of the currently attached selectors.
|
|
# Note this does not change the "root" user permissions,
|
|
# which are the permissions directly applied onto the
|
|
# user (outside the parentheses).
|
|
#
|
|
# ACL rules can be specified in any order: for instance you can start with
|
|
# passwords, then flags, or key patterns. However note that the additive
|
|
# and subtractive rules will CHANGE MEANING depending on the ordering.
|
|
# For instance see the following example:
|
|
#
|
|
# user alice on +@all -DEBUG ~* >somepassword
|
|
#
|
|
# This will allow "alice" to use all the commands with the exception of the
|
|
# DEBUG command, since +@all added all the commands to the set of the commands
|
|
# alice can use, and later DEBUG was removed. However if we invert the order
|
|
# of two ACL rules the result will be different:
|
|
#
|
|
# user alice on -DEBUG +@all ~* >somepassword
|
|
#
|
|
# Now DEBUG was removed when alice had yet no commands in the set of allowed
|
|
# commands, later all the commands are added, so the user will be able to
|
|
# execute everything.
|
|
#
|
|
# Basically ACL rules are processed left-to-right.
|
|
#
|
|
# The following is a list of command categories and their meanings:
|
|
# * keyspace - Writing or reading from keys, databases, or their metadata
|
|
# in a type agnostic way. Includes DEL, RESTORE, DUMP, RENAME, EXISTS, DBSIZE,
|
|
# KEYS, EXPIRE, TTL, FLUSHALL, etc. Commands that may modify the keyspace,
|
|
# key or metadata will also have `write` category. Commands that only read
|
|
# the keyspace, key or metadata will have the `read` category.
|
|
# * read - Reading from keys (values or metadata). Note that commands that don't
|
|
# interact with keys, will not have either `read` or `write`.
|
|
# * write - Writing to keys (values or metadata)
|
|
# * admin - Administrative commands. Normal applications will never need to use
|
|
# these. Includes REPLICAOF, CONFIG, DEBUG, SAVE, MONITOR, ACL, SHUTDOWN, etc.
|
|
# * dangerous - Potentially dangerous (each should be considered with care for
|
|
# various reasons). This includes FLUSHALL, MIGRATE, RESTORE, SORT, KEYS,
|
|
# CLIENT, DEBUG, INFO, CONFIG, SAVE, REPLICAOF, etc.
|
|
# * connection - Commands affecting the connection or other connections.
|
|
# This includes AUTH, SELECT, COMMAND, CLIENT, ECHO, PING, etc.
|
|
# * blocking - Potentially blocking the connection until released by another
|
|
# command.
|
|
# * fast - Fast O(1) commands. May loop on the number of arguments, but not the
|
|
# number of elements in the key.
|
|
# * slow - All commands that are not Fast.
|
|
# * pubsub - PUBLISH / SUBSCRIBE related
|
|
# * transaction - WATCH / MULTI / EXEC related commands.
|
|
# * scripting - Scripting related.
|
|
# * set - Data type: sets related.
|
|
# * sortedset - Data type: zsets related.
|
|
# * list - Data type: lists related.
|
|
# * hash - Data type: hashes related.
|
|
# * string - Data type: strings related.
|
|
# * bitmap - Data type: bitmaps related.
|
|
# * hyperloglog - Data type: hyperloglog related.
|
|
# * geo - Data type: geo related.
|
|
# * stream - Data type: streams related.
|
|
#
|
|
# For more information about ACL configuration please refer to
|
|
# the Redis web site at https://redis.io/topics/acl
|
|
|
|
# ACL LOG
|
|
#
|
|
# The ACL Log tracks failed commands and authentication events associated
|
|
# with ACLs. The ACL Log is useful to troubleshoot failed commands blocked
|
|
# by ACLs. The ACL Log is stored in memory. You can reclaim memory with
|
|
# ACL LOG RESET. Define the maximum entry length of the ACL Log below.
|
|
acllog-max-len 128
|
|
|
|
# Using an external ACL file
|
|
#
|
|
# Instead of configuring users here in this file, it is possible to use
|
|
# a stand-alone file just listing users. The two methods cannot be mixed:
|
|
# if you configure users here and at the same time you activate the external
|
|
# ACL file, the server will refuse to start.
|
|
#
|
|
# The format of the external ACL user file is exactly the same as the
|
|
# format that is used inside redis.conf to describe users.
|
|
#
|
|
# aclfile /etc/redis/users.acl
|
|
|
|
# IMPORTANT NOTE: starting with Redis 6 "requirepass" is just a compatibility
|
|
# layer on top of the new ACL system. The option effect will be just setting
|
|
# the password for the default user. Clients will still authenticate using
|
|
# AUTH <password> as usually, or more explicitly with AUTH default <password>
|
|
# if they follow the new protocol: both will work.
|
|
#
|
|
# The requirepass is not compatible with aclfile option and the ACL LOAD
|
|
# command, these will cause requirepass to be ignored.
|
|
#
|
|
# requirepass foobared
|
|
|
|
# New users are initialized with restrictive permissions by default, via the
|
|
# equivalent of this ACL rule 'off resetkeys -@all'. Starting with Redis 6.2, it
|
|
# is possible to manage access to Pub/Sub channels with ACL rules as well. The
|
|
# default Pub/Sub channels permission if new users is controlled by the
|
|
# acl-pubsub-default configuration directive, which accepts one of these values:
|
|
#
|
|
# allchannels: grants access to all Pub/Sub channels
|
|
# resetchannels: revokes access to all Pub/Sub channels
|
|
#
|
|
# From Redis 7.0, acl-pubsub-default defaults to 'resetchannels' permission.
|
|
#
|
|
# acl-pubsub-default resetchannels
|
|
|
|
# Command renaming (DEPRECATED).
|
|
#
|
|
# ------------------------------------------------------------------------
|
|
# WARNING: avoid using this option if possible. Instead use ACLs to remove
|
|
# commands from the default user, and put them only in some admin user you
|
|
# create for administrative purposes.
|
|
# ------------------------------------------------------------------------
|
|
#
|
|
# It is possible to change the name of dangerous commands in a shared
|
|
# environment. For instance the CONFIG command may be renamed into something
|
|
# hard to guess so that it will still be available for internal-use tools
|
|
# but not available for general clients.
|
|
#
|
|
# Example:
|
|
#
|
|
# rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
|
|
#
|
|
# It is also possible to completely kill a command by renaming it into
|
|
# an empty string:
|
|
#
|
|
# rename-command CONFIG ""
|
|
#
|
|
# Please note that changing the name of commands that are logged into the
|
|
# AOF file or transmitted to replicas may cause problems.
|
|
|
|
################################### CLIENTS ####################################
|
|
|
|
# Set the max number of connected clients at the same time. By default
|
|
# this limit is set to 10000 clients, however if the Redis server is not
|
|
# able to configure the process file limit to allow for the specified limit
|
|
# the max number of allowed clients is set to the current file limit
|
|
# minus 32 (as Redis reserves a few file descriptors for internal uses).
|
|
#
|
|
# Once the limit is reached Redis will close all the new connections sending
|
|
# an error 'max number of clients reached'.
|
|
#
|
|
# IMPORTANT: When Redis Cluster is used, the max number of connections is also
|
|
# shared with the cluster bus: every node in the cluster will use two
|
|
# connections, one incoming and another outgoing. It is important to size the
|
|
# limit accordingly in case of very large clusters.
|
|
#
|
|
# maxclients 10000
|
|
|
|
############################## MEMORY MANAGEMENT ################################
|
|
|
|
# Set a memory usage limit to the specified amount of bytes.
|
|
# When the memory limit is reached Redis will try to remove keys
|
|
# according to the eviction policy selected (see maxmemory-policy).
|
|
#
|
|
# If Redis can't remove keys according to the policy, or if the policy is
|
|
# set to 'noeviction', Redis will start to reply with errors to commands
|
|
# that would use more memory, like SET, LPUSH, and so on, and will continue
|
|
# to reply to read-only commands like GET.
|
|
#
|
|
# This option is usually useful when using Redis as an LRU or LFU cache, or to
|
|
# set a hard memory limit for an instance (using the 'noeviction' policy).
|
|
#
|
|
# WARNING: If you have replicas attached to an instance with maxmemory on,
|
|
# the size of the output buffers needed to feed the replicas are subtracted
|
|
# from the used memory count, so that network problems / resyncs will
|
|
# not trigger a loop where keys are evicted, and in turn the output
|
|
# buffer of replicas is full with DELs of keys evicted triggering the deletion
|
|
# of more keys, and so forth until the database is completely emptied.
|
|
#
|
|
# In short... if you have replicas attached it is suggested that you set a lower
|
|
# limit for maxmemory so that there is some free RAM on the system for replica
|
|
# output buffers (but this is not needed if the policy is 'noeviction').
|
|
#
|
|
# maxmemory <bytes>
|
|
|
|
# MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
|
|
# is reached. You can select one from the following behaviors:
|
|
#
|
|
# volatile-lru -> Evict using approximated LRU, only keys with an expire set.
|
|
# allkeys-lru -> Evict any key using approximated LRU.
|
|
# volatile-lfu -> Evict using approximated LFU, only keys with an expire set.
|
|
# allkeys-lfu -> Evict any key using approximated LFU.
|
|
# volatile-random -> Remove a random key having an expire set.
|
|
# allkeys-random -> Remove a random key, any key.
|
|
# volatile-ttl -> Remove the key with the nearest expire time (minor TTL)
|
|
# noeviction -> Don't evict anything, just return an error on write operations.
|
|
#
|
|
# LRU means Least Recently Used
|
|
# LFU means Least Frequently Used
|
|
#
|
|
# Both LRU, LFU and volatile-ttl are implemented using approximated
|
|
# randomized algorithms.
|
|
#
|
|
# Note: with any of the above policies, when there are no suitable keys for
|
|
# eviction, Redis will return an error on write operations that require
|
|
# more memory. These are usually commands that create new keys, add data or
|
|
# modify existing keys. A few examples are: SET, INCR, HSET, LPUSH, SUNIONSTORE,
|
|
# SORT (due to the STORE argument), and EXEC (if the transaction includes any
|
|
# command that requires memory).
|
|
#
|
|
# The default is:
|
|
#
|
|
# maxmemory-policy noeviction
|
|
|
|
# LRU, LFU and minimal TTL algorithms are not precise algorithms but approximated
|
|
# algorithms (in order to save memory), so you can tune it for speed or
|
|
# accuracy. By default Redis will check five keys and pick the one that was
|
|
# used least recently, you can change the sample size using the following
|
|
# configuration directive.
|
|
#
|
|
# The default of 5 produces good enough results. 10 Approximates very closely
|
|
# true LRU but costs more CPU. 3 is faster but not very accurate.
|
|
#
|
|
# maxmemory-samples 5
|
|
|
|
# Eviction processing is designed to function well with the default setting.
|
|
# If there is an unusually large amount of write traffic, this value may need to
|
|
# be increased. Decreasing this value may reduce latency at the risk of
|
|
# eviction processing effectiveness
|
|
# 0 = minimum latency, 10 = default, 100 = process without regard to latency
|
|
#
|
|
# maxmemory-eviction-tenacity 10
|
|
|
|
# Starting from Redis 5, by default a replica will ignore its maxmemory setting
|
|
# (unless it is promoted to master after a failover or manually). It means
|
|
# that the eviction of keys will be just handled by the master, sending the
|
|
# DEL commands to the replica as keys evict in the master side.
|
|
#
|
|
# This behavior ensures that masters and replicas stay consistent, and is usually
|
|
# what you want, however if your replica is writable, or you want the replica
|
|
# to have a different memory setting, and you are sure all the writes performed
|
|
# to the replica are idempotent, then you may change this default (but be sure
|
|
# to understand what you are doing).
|
|
#
|
|
# Note that since the replica by default does not evict, it may end using more
|
|
# memory than the one set via maxmemory (there are certain buffers that may
|
|
# be larger on the replica, or data structures may sometimes take more memory
|
|
# and so forth). So make sure you monitor your replicas and make sure they
|
|
# have enough memory to never hit a real out-of-memory condition before the
|
|
# master hits the configured maxmemory setting.
|
|
#
|
|
# replica-ignore-maxmemory yes
|
|
|
|
# Redis reclaims expired keys in two ways: upon access when those keys are
|
|
# found to be expired, and also in background, in what is called the
|
|
# "active expire key". The key space is slowly and interactively scanned
|
|
# looking for expired keys to reclaim, so that it is possible to free memory
|
|
# of keys that are expired and will never be accessed again in a short time.
|
|
#
|
|
# The default effort of the expire cycle will try to avoid having more than
|
|
# ten percent of expired keys still in memory, and will try to avoid consuming
|
|
# more than 25% of total memory and to add latency to the system. However
|
|
# it is possible to increase the expire "effort" that is normally set to
|
|
# "1", to a greater value, up to the value "10". At its maximum value the
|
|
# system will use more CPU, longer cycles (and technically may introduce
|
|
# more latency), and will tolerate less already expired keys still present
|
|
# in the system. It's a tradeoff between memory, CPU and latency.
|
|
#
|
|
# active-expire-effort 1
|
|
|
|
############################# LAZY FREEING ####################################
|
|
|
|
# Redis has two primitives to delete keys. One is called DEL and is a blocking
|
|
# deletion of the object. It means that the server stops processing new commands
|
|
# in order to reclaim all the memory associated with an object in a synchronous
|
|
# way. If the key deleted is associated with a small object, the time needed
|
|
# in order to execute the DEL command is very small and comparable to most other
|
|
# O(1) or O(log_N) commands in Redis. However if the key is associated with an
|
|
# aggregated value containing millions of elements, the server can block for
|
|
# a long time (even seconds) in order to complete the operation.
|
|
#
|
|
# For the above reasons Redis also offers non blocking deletion primitives
|
|
# such as UNLINK (non blocking DEL) and the ASYNC option of FLUSHALL and
|
|
# FLUSHDB commands, in order to reclaim memory in background. Those commands
|
|
# are executed in constant time. Another thread will incrementally free the
|
|
# object in the background as fast as possible.
|
|
#
|
|
# DEL, UNLINK and ASYNC option of FLUSHALL and FLUSHDB are user-controlled.
|
|
# It's up to the design of the application to understand when it is a good
|
|
# idea to use one or the other. However the Redis server sometimes has to
|
|
# delete keys or flush the whole database as a side effect of other operations.
|
|
# Specifically Redis deletes objects independently of a user call in the
|
|
# following scenarios:
|
|
#
|
|
# 1) On eviction, because of the maxmemory and maxmemory policy configurations,
|
|
# in order to make room for new data, without going over the specified
|
|
# memory limit.
|
|
# 2) Because of expire: when a key with an associated time to live (see the
|
|
# EXPIRE command) must be deleted from memory.
|
|
# 3) Because of a side effect of a command that stores data on a key that may
|
|
# already exist. For example the RENAME command may delete the old key
|
|
# content when it is replaced with another one. Similarly SUNIONSTORE
|
|
# or SORT with STORE option may delete existing keys. The SET command
|
|
# itself removes any old content of the specified key in order to replace
|
|
# it with the specified string.
|
|
# 4) During replication, when a replica performs a full resynchronization with
|
|
# its master, the content of the whole database is removed in order to
|
|
# load the RDB file just transferred.
|
|
#
|
|
# In all the above cases the default is to delete objects in a blocking way,
|
|
# like if DEL was called. However you can configure each case specifically
|
|
# in order to instead release memory in a non-blocking way like if UNLINK
|
|
# was called, using the following configuration directives.
|
|
|
|
lazyfree-lazy-eviction no
|
|
lazyfree-lazy-expire no
|
|
lazyfree-lazy-server-del no
|
|
replica-lazy-flush no
|
|
|
|
# It is also possible, for the case when to replace the user code DEL calls
|
|
# with UNLINK calls is not easy, to modify the default behavior of the DEL
|
|
# command to act exactly like UNLINK, using the following configuration
|
|
# directive:
|
|
|
|
lazyfree-lazy-user-del no
|
|
|
|
# FLUSHDB, FLUSHALL, SCRIPT FLUSH and FUNCTION FLUSH support both asynchronous and synchronous
|
|
# deletion, which can be controlled by passing the [SYNC|ASYNC] flags into the
|
|
# commands. When neither flag is passed, this directive will be used to determine
|
|
# if the data should be deleted asynchronously.
|
|
|
|
lazyfree-lazy-user-flush no
|
|
|
|
################################ THREADED I/O #################################
|
|
|
|
# Redis is mostly single threaded, however there are certain threaded
|
|
# operations such as UNLINK, slow I/O accesses and other things that are
|
|
# performed on side threads.
|
|
#
|
|
# Now it is also possible to handle Redis clients socket reads and writes
|
|
# in different I/O threads. Since especially writing is so slow, normally
|
|
# Redis users use pipelining in order to speed up the Redis performances per
|
|
# core, and spawn multiple instances in order to scale more. Using I/O
|
|
# threads it is possible to easily speedup two times Redis without resorting
|
|
# to pipelining nor sharding of the instance.
|
|
#
|
|
# By default threading is disabled, we suggest enabling it only in machines
|
|
# that have at least 4 or more cores, leaving at least one spare core.
|
|
# Using more than 8 threads is unlikely to help much. We also recommend using
|
|
# threaded I/O only if you actually have performance problems, with Redis
|
|
# instances being able to use a quite big percentage of CPU time, otherwise
|
|
# there is no point in using this feature.
|
|
#
|
|
# So for instance if you have a four cores boxes, try to use 2 or 3 I/O
|
|
# threads, if you have a 8 cores, try to use 6 threads. In order to
|
|
# enable I/O threads use the following configuration directive:
|
|
#
|
|
# io-threads 4
|
|
#
|
|
# Setting io-threads to 1 will just use the main thread as usual.
|
|
# When I/O threads are enabled, we only use threads for writes, that is
|
|
# to thread the write(2) syscall and transfer the client buffers to the
|
|
# socket. However it is also possible to enable threading of reads and
|
|
# protocol parsing using the following configuration directive, by setting
|
|
# it to yes:
|
|
#
|
|
# io-threads-do-reads no
|
|
#
|
|
# Usually threading reads doesn't help much.
|
|
#
|
|
# NOTE 1: This configuration directive cannot be changed at runtime via
|
|
# CONFIG SET. Also, this feature currently does not work when SSL is
|
|
# enabled.
|
|
#
|
|
# NOTE 2: If you want to test the Redis speedup using redis-benchmark, make
|
|
# sure you also run the benchmark itself in threaded mode, using the
|
|
# --threads option to match the number of Redis threads, otherwise you'll not
|
|
# be able to notice the improvements.
|
|
|
|
############################ KERNEL OOM CONTROL ##############################
|
|
|
|
# On Linux, it is possible to hint the kernel OOM killer on what processes
|
|
# should be killed first when out of memory.
|
|
#
|
|
# Enabling this feature makes Redis actively control the oom_score_adj value
|
|
# for all its processes, depending on their role. The default scores will
|
|
# attempt to have background child processes killed before all others, and
|
|
# replicas killed before masters.
|
|
#
|
|
# Redis supports these options:
|
|
#
|
|
# no: Don't make changes to oom-score-adj (default).
|
|
# yes: Alias to "relative" see below.
|
|
# absolute: Values in oom-score-adj-values are written as is to the kernel.
|
|
# relative: Values are used relative to the initial value of oom_score_adj when
|
|
# the server starts and are then clamped to a range of -1000 to 1000.
|
|
# Because typically the initial value is 0, they will often match the
|
|
# absolute values.
|
|
oom-score-adj no
|
|
|
|
# When oom-score-adj is used, this directive controls the specific values used
|
|
# for master, replica and background child processes. Values range -2000 to
|
|
# 2000 (higher means more likely to be killed).
|
|
#
|
|
# Unprivileged processes (not root, and without CAP_SYS_RESOURCE capabilities)
|
|
# can freely increase their value, but not decrease it below its initial
|
|
# settings. This means that setting oom-score-adj to "relative" and setting the
|
|
# oom-score-adj-values to positive values will always succeed.
|
|
oom-score-adj-values 0 200 800
|
|
|
|
|
|
#################### KERNEL transparent hugepage CONTROL ######################
|
|
|
|
# Usually the kernel Transparent Huge Pages control is set to "madvise" or
|
|
# or "never" by default (/sys/kernel/mm/transparent_hugepage/enabled), in which
|
|
# case this config has no effect. On systems in which it is set to "always",
|
|
# redis will attempt to disable it specifically for the redis process in order
|
|
# to avoid latency problems specifically with fork(2) and CoW.
|
|
# If for some reason you prefer to keep it enabled, you can set this config to
|
|
# "no" and the kernel global to "always".
|
|
|
|
disable-thp yes
|
|
|
|
############################## APPEND ONLY MODE ###############################
|
|
|
|
# By default Redis asynchronously dumps the dataset on disk. This mode is
|
|
# good enough in many applications, but an issue with the Redis process or
|
|
# a power outage may result into a few minutes of writes lost (depending on
|
|
# the configured save points).
|
|
#
|
|
# The Append Only File is an alternative persistence mode that provides
|
|
# much better durability. For instance using the default data fsync policy
|
|
# (see later in the config file) Redis can lose just one second of writes in a
|
|
# dramatic event like a server power outage, or a single write if something
|
|
# wrong with the Redis process itself happens, but the operating system is
|
|
# still running correctly.
|
|
#
|
|
# AOF and RDB persistence can be enabled at the same time without problems.
|
|
# If the AOF is enabled on startup Redis will load the AOF, that is the file
|
|
# with the better durability guarantees.
|
|
#
|
|
# Please check https://redis.io/topics/persistence for more information.
|
|
|
|
appendonly no
|
|
|
|
# The base name of the append only file.
|
|
#
|
|
# Redis 7 and newer use a set of append-only files to persist the dataset
|
|
# and changes applied to it. There are two basic types of files in use:
|
|
#
|
|
# - Base files, which are a snapshot representing the complete state of the
|
|
# dataset at the time the file was created. Base files can be either in
|
|
# the form of RDB (binary serialized) or AOF (textual commands).
|
|
# - Incremental files, which contain additional commands that were applied
|
|
# to the dataset following the previous file.
|
|
#
|
|
# In addition, manifest files are used to track the files and the order in
|
|
# which they were created and should be applied.
|
|
#
|
|
# Append-only file names are created by Redis following a specific pattern.
|
|
# The file name's prefix is based on the 'appendfilename' configuration
|
|
# parameter, followed by additional information about the sequence and type.
|
|
#
|
|
# For example, if appendfilename is set to appendonly.aof, the following file
|
|
# names could be derived:
|
|
#
|
|
# - appendonly.aof.1.base.rdb as a base file.
|
|
# - appendonly.aof.1.incr.aof, appendonly.aof.2.incr.aof as incremental files.
|
|
# - appendonly.aof.manifest as a manifest file.
|
|
|
|
appendfilename "appendonly.aof"
|
|
|
|
# For convenience, Redis stores all persistent append-only files in a dedicated
|
|
# directory. The name of the directory is determined by the appenddirname
|
|
# configuration parameter.
|
|
|
|
appenddirname "appendonlydir"
|
|
|
|
# The fsync() call tells the Operating System to actually write data on disk
|
|
# instead of waiting for more data in the output buffer. Some OS will really flush
|
|
# data on disk, some other OS will just try to do it ASAP.
|
|
#
|
|
# Redis supports three different modes:
|
|
#
|
|
# no: don't fsync, just let the OS flush the data when it wants. Faster.
|
|
# always: fsync after every write to the append only log. Slow, Safest.
|
|
# everysec: fsync only one time every second. Compromise.
|
|
#
|
|
# The default is "everysec", as that's usually the right compromise between
|
|
# speed and data safety. It's up to you to understand if you can relax this to
|
|
# "no" that will let the operating system flush the output buffer when
|
|
# it wants, for better performances (but if you can live with the idea of
|
|
# some data loss consider the default persistence mode that's snapshotting),
|
|
# or on the contrary, use "always" that's very slow but a bit safer than
|
|
# everysec.
|
|
#
|
|
# More details please check the following article:
|
|
# http://antirez.com/post/redis-persistence-demystified.html
|
|
#
|
|
# If unsure, use "everysec".
|
|
|
|
# appendfsync always
|
|
appendfsync everysec
|
|
# appendfsync no
|
|
|
|
# When the AOF fsync policy is set to always or everysec, and a background
|
|
# saving process (a background save or AOF log background rewriting) is
|
|
# performing a lot of I/O against the disk, in some Linux configurations
|
|
# Redis may block too long on the fsync() call. Note that there is no fix for
|
|
# this currently, as even performing fsync in a different thread will block
|
|
# our synchronous write(2) call.
|
|
#
|
|
# In order to mitigate this problem it's possible to use the following option
|
|
# that will prevent fsync() from being called in the main process while a
|
|
# BGSAVE or BGREWRITEAOF is in progress.
|
|
#
|
|
# This means that while another child is saving, the durability of Redis is
|
|
# the same as "appendfsync no". In practical terms, this means that it is
|
|
# possible to lose up to 30 seconds of log in the worst scenario (with the
|
|
# default Linux settings).
|
|
#
|
|
# If you have latency problems turn this to "yes". Otherwise leave it as
|
|
# "no" that is the safest pick from the point of view of durability.
|
|
|
|
no-appendfsync-on-rewrite no
|
|
|
|
# Automatic rewrite of the append only file.
|
|
# Redis is able to automatically rewrite the log file implicitly calling
|
|
# BGREWRITEAOF when the AOF log size grows by the specified percentage.
|
|
#
|
|
# This is how it works: Redis remembers the size of the AOF file after the
|
|
# latest rewrite (if no rewrite has happened since the restart, the size of
|
|
# the AOF at startup is used).
|
|
#
|
|
# This base size is compared to the current size. If the current size is
|
|
# bigger than the specified percentage, the rewrite is triggered. Also
|
|
# you need to specify a minimal size for the AOF file to be rewritten, this
|
|
# is useful to avoid rewriting the AOF file even if the percentage increase
|
|
# is reached but it is still pretty small.
|
|
#
|
|
# Specify a percentage of zero in order to disable the automatic AOF
|
|
# rewrite feature.
|
|
|
|
auto-aof-rewrite-percentage 100
|
|
auto-aof-rewrite-min-size 64mb
|
|
|
|
# An AOF file may be found to be truncated at the end during the Redis
|
|
# startup process, when the AOF data gets loaded back into memory.
|
|
# This may happen when the system where Redis is running
|
|
# crashes, especially when an ext4 filesystem is mounted without the
|
|
# data=ordered option (however this can't happen when Redis itself
|
|
# crashes or aborts but the operating system still works correctly).
|
|
#
|
|
# Redis can either exit with an error when this happens, or load as much
|
|
# data as possible (the default now) and start if the AOF file is found
|
|
# to be truncated at the end. The following option controls this behavior.
|
|
#
|
|
# If aof-load-truncated is set to yes, a truncated AOF file is loaded and
|
|
# the Redis server starts emitting a log to inform the user of the event.
|
|
# Otherwise if the option is set to no, the server aborts with an error
|
|
# and refuses to start. When the option is set to no, the user requires
|
|
# to fix the AOF file using the "redis-check-aof" utility before to restart
|
|
# the server.
|
|
#
|
|
# Note that if the AOF file will be found to be corrupted in the middle
|
|
# the server will still exit with an error. This option only applies when
|
|
# Redis will try to read more data from the AOF file but not enough bytes
|
|
# will be found.
|
|
aof-load-truncated yes
|
|
|
|
# Redis can create append-only base files in either RDB or AOF formats. Using
|
|
# the RDB format is always faster and more efficient, and disabling it is only
|
|
# supported for backward compatibility purposes.
|
|
aof-use-rdb-preamble yes
|
|
|
|
# Redis supports recording timestamp annotations in the AOF to support restoring
|
|
# the data from a specific point-in-time. However, using this capability changes
|
|
# the AOF format in a way that may not be compatible with existing AOF parsers.
|
|
aof-timestamp-enabled no
|
|
|
|
################################ SHUTDOWN #####################################
|
|
|
|
# Maximum time to wait for replicas when shutting down, in seconds.
|
|
#
|
|
# During shut down, a grace period allows any lagging replicas to catch up with
|
|
# the latest replication offset before the master exists. This period can
|
|
# prevent data loss, especially for deployments without configured disk backups.
|
|
#
|
|
# The 'shutdown-timeout' value is the grace period's duration in seconds. It is
|
|
# only applicable when the instance has replicas. To disable the feature, set
|
|
# the value to 0.
|
|
#
|
|
# shutdown-timeout 10
|
|
|
|
# When Redis receives a SIGINT or SIGTERM, shutdown is initiated and by default
|
|
# an RDB snapshot is written to disk in a blocking operation if save points are configured.
|
|
# The options used on signaled shutdown can include the following values:
|
|
# default: Saves RDB snapshot only if save points are configured.
|
|
# Waits for lagging replicas to catch up.
|
|
# save: Forces a DB saving operation even if no save points are configured.
|
|
# nosave: Prevents DB saving operation even if one or more save points are configured.
|
|
# now: Skips waiting for lagging replicas.
|
|
# force: Ignores any errors that would normally prevent the server from exiting.
|
|
#
|
|
# Any combination of values is allowed as long as "save" and "nosave" are not set simultaneously.
|
|
# Example: "nosave force now"
|
|
#
|
|
# shutdown-on-sigint default
|
|
# shutdown-on-sigterm default
|
|
|
|
################ NON-DETERMINISTIC LONG BLOCKING COMMANDS #####################
|
|
|
|
# Maximum time in milliseconds for EVAL scripts, functions and in some cases
|
|
# modules' commands before Redis can start processing or rejecting other clients.
|
|
#
|
|
# If the maximum execution time is reached Redis will start to reply to most
|
|
# commands with a BUSY error.
|
|
#
|
|
# In this state Redis will only allow a handful of commands to be executed.
|
|
# For instance, SCRIPT KILL, FUNCTION KILL, SHUTDOWN NOSAVE and possibly some
|
|
# module specific 'allow-busy' commands.
|
|
#
|
|
# SCRIPT KILL and FUNCTION KILL will only be able to stop a script that did not
|
|
# yet call any write commands, so SHUTDOWN NOSAVE may be the only way to stop
|
|
# the server in the case a write command was already issued by the script when
|
|
# the user doesn't want to wait for the natural termination of the script.
|
|
#
|
|
# The default is 5 seconds. It is possible to set it to 0 or a negative value
|
|
# to disable this mechanism (uninterrupted execution). Note that in the past
|
|
# this config had a different name, which is now an alias, so both of these do
|
|
# the same:
|
|
# lua-time-limit 5000
|
|
# busy-reply-threshold 5000
|
|
|
|
################################ REDIS CLUSTER ###############################
|
|
|
|
# Normal Redis instances can't be part of a Redis Cluster; only nodes that are
|
|
# started as cluster nodes can. In order to start a Redis instance as a
|
|
# cluster node enable the cluster support uncommenting the following:
|
|
#
|
|
# cluster-enabled yes
|
|
|
|
# Every cluster node has a cluster configuration file. This file is not
|
|
# intended to be edited by hand. It is created and updated by Redis nodes.
|
|
# Every Redis Cluster node requires a different cluster configuration file.
|
|
# Make sure that instances running in the same system do not have
|
|
# overlapping cluster configuration file names.
|
|
#
|
|
# cluster-config-file nodes-6379.conf
|
|
|
|
# Cluster node timeout is the amount of milliseconds a node must be unreachable
|
|
# for it to be considered in failure state.
|
|
# Most other internal time limits are a multiple of the node timeout.
|
|
#
|
|
# cluster-node-timeout 15000
|
|
|
|
# The cluster port is the port that the cluster bus will listen for inbound connections on. When set
|
|
# to the default value, 0, it will be bound to the command port + 10000. Setting this value requires
|
|
# you to specify the cluster bus port when executing cluster meet.
|
|
# cluster-port 0
|
|
|
|
# A replica of a failing master will avoid to start a failover if its data
|
|
# looks too old.
|
|
#
|
|
# There is no simple way for a replica to actually have an exact measure of
|
|
# its "data age", so the following two checks are performed:
|
|
#
|
|
# 1) If there are multiple replicas able to failover, they exchange messages
|
|
# in order to try to give an advantage to the replica with the best
|
|
# replication offset (more data from the master processed).
|
|
# Replicas will try to get their rank by offset, and apply to the start
|
|
# of the failover a delay proportional to their rank.
|
|
#
|
|
# 2) Every single replica computes the time of the last interaction with
|
|
# its master. This can be the last ping or command received (if the master
|
|
# is still in the "connected" state), or the time that elapsed since the
|
|
# disconnection with the master (if the replication link is currently down).
|
|
# If the last interaction is too old, the replica will not try to failover
|
|
# at all.
|
|
#
|
|
# The point "2" can be tuned by user. Specifically a replica will not perform
|
|
# the failover if, since the last interaction with the master, the time
|
|
# elapsed is greater than:
|
|
#
|
|
# (node-timeout * cluster-replica-validity-factor) + repl-ping-replica-period
|
|
#
|
|
# So for example if node-timeout is 30 seconds, and the cluster-replica-validity-factor
|
|
# is 10, and assuming a default repl-ping-replica-period of 10 seconds, the
|
|
# replica will not try to failover if it was not able to talk with the master
|
|
# for longer than 310 seconds.
|
|
#
|
|
# A large cluster-replica-validity-factor may allow replicas with too old data to failover
|
|
# a master, while a too small value may prevent the cluster from being able to
|
|
# elect a replica at all.
|
|
#
|
|
# For maximum availability, it is possible to set the cluster-replica-validity-factor
|
|
# to a value of 0, which means, that replicas will always try to failover the
|
|
# master regardless of the last time they interacted with the master.
|
|
# (However they'll always try to apply a delay proportional to their
|
|
# offset rank).
|
|
#
|
|
# Zero is the only value able to guarantee that when all the partitions heal
|
|
# the cluster will always be able to continue.
|
|
#
|
|
# cluster-replica-validity-factor 10
|
|
|
|
# Cluster replicas are able to migrate to orphaned masters, that are masters
|
|
# that are left without working replicas. This improves the cluster ability
|
|
# to resist to failures as otherwise an orphaned master can't be failed over
|
|
# in case of failure if it has no working replicas.
|
|
#
|
|
# Replicas migrate to orphaned masters only if there are still at least a
|
|
# given number of other working replicas for their old master. This number
|
|
# is the "migration barrier". A migration barrier of 1 means that a replica
|
|
# will migrate only if there is at least 1 other working replica for its master
|
|
# and so forth. It usually reflects the number of replicas you want for every
|
|
# master in your cluster.
|
|
#
|
|
# Default is 1 (replicas migrate only if their masters remain with at least
|
|
# one replica). To disable migration just set it to a very large value or
|
|
# set cluster-allow-replica-migration to 'no'.
|
|
# A value of 0 can be set but is useful only for debugging and dangerous
|
|
# in production.
|
|
#
|
|
# cluster-migration-barrier 1
|
|
|
|
# Turning off this option allows to use less automatic cluster configuration.
|
|
# It both disables migration to orphaned masters and migration from masters
|
|
# that became empty.
|
|
#
|
|
# Default is 'yes' (allow automatic migrations).
|
|
#
|
|
# cluster-allow-replica-migration yes
|
|
|
|
# By default Redis Cluster nodes stop accepting queries if they detect there
|
|
# is at least a hash slot uncovered (no available node is serving it).
|
|
# This way if the cluster is partially down (for example a range of hash slots
|
|
# are no longer covered) all the cluster becomes, eventually, unavailable.
|
|
# It automatically returns available as soon as all the slots are covered again.
|
|
#
|
|
# However sometimes you want the subset of the cluster which is working,
|
|
# to continue to accept queries for the part of the key space that is still
|
|
# covered. In order to do so, just set the cluster-require-full-coverage
|
|
# option to no.
|
|
#
|
|
# cluster-require-full-coverage yes
|
|
|
|
# This option, when set to yes, prevents replicas from trying to failover its
|
|
# master during master failures. However the replica can still perform a
|
|
# manual failover, if forced to do so.
|
|
#
|
|
# This is useful in different scenarios, especially in the case of multiple
|
|
# data center operations, where we want one side to never be promoted if not
|
|
# in the case of a total DC failure.
|
|
#
|
|
# cluster-replica-no-failover no
|
|
|
|
# This option, when set to yes, allows nodes to serve read traffic while the
|
|
# cluster is in a down state, as long as it believes it owns the slots.
|
|
#
|
|
# This is useful for two cases. The first case is for when an application
|
|
# doesn't require consistency of data during node failures or network partitions.
|
|
# One example of this is a cache, where as long as the node has the data it
|
|
# should be able to serve it.
|
|
#
|
|
# The second use case is for configurations that don't meet the recommended
|
|
# three shards but want to enable cluster mode and scale later. A
|
|
# master outage in a 1 or 2 shard configuration causes a read/write outage to the
|
|
# entire cluster without this option set, with it set there is only a write outage.
|
|
# Without a quorum of masters, slot ownership will not change automatically.
|
|
#
|
|
# cluster-allow-reads-when-down no
|
|
|
|
# This option, when set to yes, allows nodes to serve pubsub shard traffic while
|
|
# the cluster is in a down state, as long as it believes it owns the slots.
|
|
#
|
|
# This is useful if the application would like to use the pubsub feature even when
|
|
# the cluster global stable state is not OK. If the application wants to make sure only
|
|
# one shard is serving a given channel, this feature should be kept as yes.
|
|
#
|
|
# cluster-allow-pubsubshard-when-down yes
|
|
|
|
# Cluster link send buffer limit is the limit on the memory usage of an individual
|
|
# cluster bus link's send buffer in bytes. Cluster links would be freed if they exceed
|
|
# this limit. This is to primarily prevent send buffers from growing unbounded on links
|
|
# toward slow peers (E.g. PubSub messages being piled up).
|
|
# This limit is disabled by default. Enable this limit when 'mem_cluster_links' INFO field
|
|
# and/or 'send-buffer-allocated' entries in the 'CLUSTER LINKS` command output continuously increase.
|
|
# Minimum limit of 1gb is recommended so that cluster link buffer can fit in at least a single
|
|
# PubSub message by default. (client-query-buffer-limit default value is 1gb)
|
|
#
|
|
# cluster-link-sendbuf-limit 0
|
|
|
|
# Clusters can configure their announced hostname using this config. This is a common use case for
|
|
# applications that need to use TLS Server Name Indication (SNI) or dealing with DNS based
|
|
# routing. By default this value is only shown as additional metadata in the CLUSTER SLOTS
|
|
# command, but can be changed using 'cluster-preferred-endpoint-type' config. This value is
|
|
# communicated along the clusterbus to all nodes, setting it to an empty string will remove
|
|
# the hostname and also propagate the removal.
|
|
#
|
|
# cluster-announce-hostname ""
|
|
|
|
# Clusters can advertise how clients should connect to them using either their IP address,
|
|
# a user defined hostname, or by declaring they have no endpoint. Which endpoint is
|
|
# shown as the preferred endpoint is set by using the cluster-preferred-endpoint-type
|
|
# config with values 'ip', 'hostname', or 'unknown-endpoint'. This value controls how
|
|
# the endpoint returned for MOVED/ASKING requests as well as the first field of CLUSTER SLOTS.
|
|
# If the preferred endpoint type is set to hostname, but no announced hostname is set, a '?'
|
|
# will be returned instead.
|
|
#
|
|
# When a cluster advertises itself as having an unknown endpoint, it's indicating that
|
|
# the server doesn't know how clients can reach the cluster. This can happen in certain
|
|
# networking situations where there are multiple possible routes to the node, and the
|
|
# server doesn't know which one the client took. In this case, the server is expecting
|
|
# the client to reach out on the same endpoint it used for making the last request, but use
|
|
# the port provided in the response.
|
|
#
|
|
# cluster-preferred-endpoint-type ip
|
|
|
|
# In order to setup your cluster make sure to read the documentation
|
|
# available at https://redis.io web site.
|
|
|
|
########################## CLUSTER DOCKER/NAT support ########################
|
|
|
|
# In certain deployments, Redis Cluster nodes address discovery fails, because
|
|
# addresses are NAT-ted or because ports are forwarded (the typical case is
|
|
# Docker and other containers).
|
|
#
|
|
# In order to make Redis Cluster working in such environments, a static
|
|
# configuration where each node knows its public address is needed. The
|
|
# following four options are used for this scope, and are:
|
|
#
|
|
# * cluster-announce-ip
|
|
# * cluster-announce-port
|
|
# * cluster-announce-tls-port
|
|
# * cluster-announce-bus-port
|
|
#
|
|
# Each instructs the node about its address, client ports (for connections
|
|
# without and with TLS) and cluster message bus port. The information is then
|
|
# published in the header of the bus packets so that other nodes will be able to
|
|
# correctly map the address of the node publishing the information.
|
|
#
|
|
# If cluster-tls is set to yes and cluster-announce-tls-port is omitted or set
|
|
# to zero, then cluster-announce-port refers to the TLS port. Note also that
|
|
# cluster-announce-tls-port has no effect if cluster-tls is set to no.
|
|
#
|
|
# If the above options are not used, the normal Redis Cluster auto-detection
|
|
# will be used instead.
|
|
#
|
|
# Note that when remapped, the bus port may not be at the fixed offset of
|
|
# clients port + 10000, so you can specify any port and bus-port depending
|
|
# on how they get remapped. If the bus-port is not set, a fixed offset of
|
|
# 10000 will be used as usual.
|
|
#
|
|
# Example:
|
|
#
|
|
# cluster-announce-ip 10.1.1.5
|
|
# cluster-announce-tls-port 6379
|
|
# cluster-announce-port 0
|
|
# cluster-announce-bus-port 6380
|
|
|
|
################################## SLOW LOG ###################################
|
|
|
|
# The Redis Slow Log is a system to log queries that exceeded a specified
|
|
# execution time. The execution time does not include the I/O operations
|
|
# like talking with the client, sending the reply and so forth,
|
|
# but just the time needed to actually execute the command (this is the only
|
|
# stage of command execution where the thread is blocked and can not serve
|
|
# other requests in the meantime).
|
|
#
|
|
# You can configure the slow log with two parameters: one tells Redis
|
|
# what is the execution time, in microseconds, to exceed in order for the
|
|
# command to get logged, and the other parameter is the length of the
|
|
# slow log. When a new command is logged the oldest one is removed from the
|
|
# queue of logged commands.
|
|
|
|
# The following time is expressed in microseconds, so 1000000 is equivalent
|
|
# to one second. Note that a negative number disables the slow log, while
|
|
# a value of zero forces the logging of every command.
|
|
slowlog-log-slower-than 10000
|
|
|
|
# There is no limit to this length. Just be aware that it will consume memory.
|
|
# You can reclaim memory used by the slow log with SLOWLOG RESET.
|
|
slowlog-max-len 128
|
|
|
|
################################ LATENCY MONITOR ##############################
|
|
|
|
# The Redis latency monitoring subsystem samples different operations
|
|
# at runtime in order to collect data related to possible sources of
|
|
# latency of a Redis instance.
|
|
#
|
|
# Via the LATENCY command this information is available to the user that can
|
|
# print graphs and obtain reports.
|
|
#
|
|
# The system only logs operations that were performed in a time equal or
|
|
# greater than the amount of milliseconds specified via the
|
|
# latency-monitor-threshold configuration directive. When its value is set
|
|
# to zero, the latency monitor is turned off.
|
|
#
|
|
# By default latency monitoring is disabled since it is mostly not needed
|
|
# if you don't have latency issues, and collecting data has a performance
|
|
# impact, that while very small, can be measured under big load. Latency
|
|
# monitoring can easily be enabled at runtime using the command
|
|
# "CONFIG SET latency-monitor-threshold <milliseconds>" if needed.
|
|
latency-monitor-threshold 0
|
|
|
|
################################ LATENCY TRACKING ##############################
|
|
|
|
# The Redis extended latency monitoring tracks the per command latencies and enables
|
|
# exporting the percentile distribution via the INFO latencystats command,
|
|
# and cumulative latency distributions (histograms) via the LATENCY command.
|
|
#
|
|
# By default, the extended latency monitoring is enabled since the overhead
|
|
# of keeping track of the command latency is very small.
|
|
# latency-tracking yes
|
|
|
|
# By default the exported latency percentiles via the INFO latencystats command
|
|
# are the p50, p99, and p999.
|
|
# latency-tracking-info-percentiles 50 99 99.9
|
|
|
|
############################# EVENT NOTIFICATION ##############################
|
|
|
|
# Redis can notify Pub/Sub clients about events happening in the key space.
|
|
# This feature is documented at https://redis.io/topics/notifications
|
|
#
|
|
# For instance if keyspace events notification is enabled, and a client
|
|
# performs a DEL operation on key "foo" stored in the Database 0, two
|
|
# messages will be published via Pub/Sub:
|
|
#
|
|
# PUBLISH __keyspace@0__:foo del
|
|
# PUBLISH __keyevent@0__:del foo
|
|
#
|
|
# It is possible to select the events that Redis will notify among a set
|
|
# of classes. Every class is identified by a single character:
|
|
#
|
|
# K Keyspace events, published with __keyspace@<db>__ prefix.
|
|
# E Keyevent events, published with __keyevent@<db>__ prefix.
|
|
# g Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
|
|
# $ String commands
|
|
# l List commands
|
|
# s Set commands
|
|
# h Hash commands
|
|
# z Sorted set commands
|
|
# x Expired events (events generated every time a key expires)
|
|
# e Evicted events (events generated when a key is evicted for maxmemory)
|
|
# n New key events (Note: not included in the 'A' class)
|
|
# t Stream commands
|
|
# d Module key type events
|
|
# m Key-miss events (Note: It is not included in the 'A' class)
|
|
# A Alias for g$lshzxetd, so that the "AKE" string means all the events
|
|
# (Except key-miss events which are excluded from 'A' due to their
|
|
# unique nature).
|
|
#
|
|
# The "notify-keyspace-events" takes as argument a string that is composed
|
|
# of zero or multiple characters. The empty string means that notifications
|
|
# are disabled.
|
|
#
|
|
# Example: to enable list and generic events, from the point of view of the
|
|
# event name, use:
|
|
#
|
|
# notify-keyspace-events Elg
|
|
#
|
|
# Example 2: to get the stream of the expired keys subscribing to channel
|
|
# name __keyevent@0__:expired use:
|
|
#
|
|
# notify-keyspace-events Ex
|
|
#
|
|
# By default all notifications are disabled because most users don't need
|
|
# this feature and the feature has some overhead. Note that if you don't
|
|
# specify at least one of K or E, no events will be delivered.
|
|
notify-keyspace-events ""
|
|
|
|
############################### ADVANCED CONFIG ###############################
|
|
|
|
# Hashes are encoded using a memory efficient data structure when they have a
|
|
# small number of entries, and the biggest entry does not exceed a given
|
|
# threshold. These thresholds can be configured using the following directives.
|
|
hash-max-listpack-entries 512
|
|
hash-max-listpack-value 64
|
|
|
|
# Lists are also encoded in a special way to save a lot of space.
|
|
# The number of entries allowed per internal list node can be specified
|
|
# as a fixed maximum size or a maximum number of elements.
|
|
# For a fixed maximum size, use -5 through -1, meaning:
|
|
# -5: max size: 64 Kb <-- not recommended for normal workloads
|
|
# -4: max size: 32 Kb <-- not recommended
|
|
# -3: max size: 16 Kb <-- probably not recommended
|
|
# -2: max size: 8 Kb <-- good
|
|
# -1: max size: 4 Kb <-- good
|
|
# Positive numbers mean store up to _exactly_ that number of elements
|
|
# per list node.
|
|
# The highest performing option is usually -2 (8 Kb size) or -1 (4 Kb size),
|
|
# but if your use case is unique, adjust the settings as necessary.
|
|
list-max-listpack-size -2
|
|
|
|
# Lists may also be compressed.
|
|
# Compress depth is the number of quicklist ziplist nodes from *each* side of
|
|
# the list to *exclude* from compression. The head and tail of the list
|
|
# are always uncompressed for fast push/pop operations. Settings are:
|
|
# 0: disable all list compression
|
|
# 1: depth 1 means "don't start compressing until after 1 node into the list,
|
|
# going from either the head or tail"
|
|
# So: [head]->node->node->...->node->[tail]
|
|
# [head], [tail] will always be uncompressed; inner nodes will compress.
|
|
# 2: [head]->[next]->node->node->...->node->[prev]->[tail]
|
|
# 2 here means: don't compress head or head->next or tail->prev or tail,
|
|
# but compress all nodes between them.
|
|
# 3: [head]->[next]->[next]->node->node->...->node->[prev]->[prev]->[tail]
|
|
# etc.
|
|
list-compress-depth 0
|
|
|
|
# Sets have a special encoding in just one case: when a set is composed
|
|
# of just strings that happen to be integers in radix 10 in the range
|
|
# of 64 bit signed integers.
|
|
# The following configuration setting sets the limit in the size of the
|
|
# set in order to use this special memory saving encoding.
|
|
set-max-intset-entries 512
|
|
|
|
# Similarly to hashes and lists, sorted sets are also specially encoded in
|
|
# order to save a lot of space. This encoding is only used when the length and
|
|
# elements of a sorted set are below the following limits:
|
|
zset-max-listpack-entries 128
|
|
zset-max-listpack-value 64
|
|
|
|
# HyperLogLog sparse representation bytes limit. The limit includes the
|
|
# 16 bytes header. When an HyperLogLog using the sparse representation crosses
|
|
# this limit, it is converted into the dense representation.
|
|
#
|
|
# A value greater than 16000 is totally useless, since at that point the
|
|
# dense representation is more memory efficient.
|
|
#
|
|
# The suggested value is ~ 3000 in order to have the benefits of
|
|
# the space efficient encoding without slowing down too much PFADD,
|
|
# which is O(N) with the sparse encoding. The value can be raised to
|
|
# ~ 10000 when CPU is not a concern, but space is, and the data set is
|
|
# composed of many HyperLogLogs with cardinality in the 0 - 15000 range.
|
|
hll-sparse-max-bytes 3000
|
|
|
|
# Streams macro node max size / items. The stream data structure is a radix
|
|
# tree of big nodes that encode multiple items inside. Using this configuration
|
|
# it is possible to configure how big a single node can be in bytes, and the
|
|
# maximum number of items it may contain before switching to a new node when
|
|
# appending new stream entries. If any of the following settings are set to
|
|
# zero, the limit is ignored, so for instance it is possible to set just a
|
|
# max entries limit by setting max-bytes to 0 and max-entries to the desired
|
|
# value.
|
|
stream-node-max-bytes 4096
|
|
stream-node-max-entries 100
|
|
|
|
# Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
|
|
# order to help rehashing the main Redis hash table (the one mapping top-level
|
|
# keys to values). The hash table implementation Redis uses (see dict.c)
|
|
# performs a lazy rehashing: the more operation you run into a hash table
|
|
# that is rehashing, the more rehashing "steps" are performed, so if the
|
|
# server is idle the rehashing is never complete and some more memory is used
|
|
# by the hash table.
|
|
#
|
|
# The default is to use this millisecond 10 times every second in order to
|
|
# actively rehash the main dictionaries, freeing memory when possible.
|
|
#
|
|
# If unsure:
|
|
# use "activerehashing no" if you have hard latency requirements and it is
|
|
# not a good thing in your environment that Redis can reply from time to time
|
|
# to queries with 2 milliseconds delay.
|
|
#
|
|
# use "activerehashing yes" if you don't have such hard requirements but
|
|
# want to free memory asap when possible.
|
|
activerehashing yes
|
|
|
|
# The client output buffer limits can be used to force disconnection of clients
|
|
# that are not reading data from the server fast enough for some reason (a
|
|
# common reason is that a Pub/Sub client can't consume messages as fast as the
|
|
# publisher can produce them).
|
|
#
|
|
# The limit can be set differently for the three different classes of clients:
|
|
#
|
|
# normal -> normal clients including MONITOR clients
|
|
# replica -> replica clients
|
|
# pubsub -> clients subscribed to at least one pubsub channel or pattern
|
|
#
|
|
# The syntax of every client-output-buffer-limit directive is the following:
|
|
#
|
|
# client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
|
|
#
|
|
# A client is immediately disconnected once the hard limit is reached, or if
|
|
# the soft limit is reached and remains reached for the specified number of
|
|
# seconds (continuously).
|
|
# So for instance if the hard limit is 32 megabytes and the soft limit is
|
|
# 16 megabytes / 10 seconds, the client will get disconnected immediately
|
|
# if the size of the output buffers reach 32 megabytes, but will also get
|
|
# disconnected if the client reaches 16 megabytes and continuously overcomes
|
|
# the limit for 10 seconds.
|
|
#
|
|
# By default normal clients are not limited because they don't receive data
|
|
# without asking (in a push way), but just after a request, so only
|
|
# asynchronous clients may create a scenario where data is requested faster
|
|
# than it can read.
|
|
#
|
|
# Instead there is a default limit for pubsub and replica clients, since
|
|
# subscribers and replicas receive data in a push fashion.
|
|
#
|
|
# Note that it doesn't make sense to set the replica clients output buffer
|
|
# limit lower than the repl-backlog-size config (partial sync will succeed
|
|
# and then replica will get disconnected).
|
|
# Such a configuration is ignored (the size of repl-backlog-size will be used).
|
|
# This doesn't have memory consumption implications since the replica client
|
|
# will share the backlog buffers memory.
|
|
#
|
|
# Both the hard or the soft limit can be disabled by setting them to zero.
|
|
client-output-buffer-limit normal 0 0 0
|
|
client-output-buffer-limit replica 256mb 64mb 60
|
|
client-output-buffer-limit pubsub 32mb 8mb 60
|
|
|
|
# Client query buffers accumulate new commands. They are limited to a fixed
|
|
# amount by default in order to avoid that a protocol desynchronization (for
|
|
# instance due to a bug in the client) will lead to unbound memory usage in
|
|
# the query buffer. However you can configure it here if you have very special
|
|
# needs, such us huge multi/exec requests or alike.
|
|
#
|
|
# client-query-buffer-limit 1gb
|
|
|
|
# In some scenarios client connections can hog up memory leading to OOM
|
|
# errors or data eviction. To avoid this we can cap the accumulated memory
|
|
# used by all client connections (all pubsub and normal clients). Once we
|
|
# reach that limit connections will be dropped by the server freeing up
|
|
# memory. The server will attempt to drop the connections using the most
|
|
# memory first. We call this mechanism "client eviction".
|
|
#
|
|
# Client eviction is configured using the maxmemory-clients setting as follows:
|
|
# 0 - client eviction is disabled (default)
|
|
#
|
|
# A memory value can be used for the client eviction threshold,
|
|
# for example:
|
|
# maxmemory-clients 1g
|
|
#
|
|
# A percentage value (between 1% and 100%) means the client eviction threshold
|
|
# is based on a percentage of the maxmemory setting. For example to set client
|
|
# eviction at 5% of maxmemory:
|
|
# maxmemory-clients 5%
|
|
|
|
# In the Redis protocol, bulk requests, that are, elements representing single
|
|
# strings, are normally limited to 512 mb. However you can change this limit
|
|
# here, but must be 1mb or greater
|
|
#
|
|
# proto-max-bulk-len 512mb
|
|
|
|
# Redis calls an internal function to perform many background tasks, like
|
|
# closing connections of clients in timeout, purging expired keys that are
|
|
# never requested, and so forth.
|
|
#
|
|
# Not all tasks are performed with the same frequency, but Redis checks for
|
|
# tasks to perform according to the specified "hz" value.
|
|
#
|
|
# By default "hz" is set to 10. Raising the value will use more CPU when
|
|
# Redis is idle, but at the same time will make Redis more responsive when
|
|
# there are many keys expiring at the same time, and timeouts may be
|
|
# handled with more precision.
|
|
#
|
|
# The range is between 1 and 500, however a value over 100 is usually not
|
|
# a good idea. Most users should use the default of 10 and raise this up to
|
|
# 100 only in environments where very low latency is required.
|
|
hz 10
|
|
|
|
# Normally it is useful to have an HZ value which is proportional to the
|
|
# number of clients connected. This is useful in order, for instance, to
|
|
# avoid too many clients are processed for each background task invocation
|
|
# in order to avoid latency spikes.
|
|
#
|
|
# Since the default HZ value by default is conservatively set to 10, Redis
|
|
# offers, and enables by default, the ability to use an adaptive HZ value
|
|
# which will temporarily raise when there are many connected clients.
|
|
#
|
|
# When dynamic HZ is enabled, the actual configured HZ will be used
|
|
# as a baseline, but multiples of the configured HZ value will be actually
|
|
# used as needed once more clients are connected. In this way an idle
|
|
# instance will use very little CPU time while a busy instance will be
|
|
# more responsive.
|
|
dynamic-hz yes
|
|
|
|
# When a child rewrites the AOF file, if the following option is enabled
|
|
# the file will be fsync-ed every 4 MB of data generated. This is useful
|
|
# in order to commit the file to the disk more incrementally and avoid
|
|
# big latency spikes.
|
|
aof-rewrite-incremental-fsync yes
|
|
|
|
# When redis saves RDB file, if the following option is enabled
|
|
# the file will be fsync-ed every 4 MB of data generated. This is useful
|
|
# in order to commit the file to the disk more incrementally and avoid
|
|
# big latency spikes.
|
|
rdb-save-incremental-fsync yes
|
|
|
|
# Redis LFU eviction (see maxmemory setting) can be tuned. However it is a good
|
|
# idea to start with the default settings and only change them after investigating
|
|
# how to improve the performances and how the keys LFU change over time, which
|
|
# is possible to inspect via the OBJECT FREQ command.
|
|
#
|
|
# There are two tunable parameters in the Redis LFU implementation: the
|
|
# counter logarithm factor and the counter decay time. It is important to
|
|
# understand what the two parameters mean before changing them.
|
|
#
|
|
# The LFU counter is just 8 bits per key, it's maximum value is 255, so Redis
|
|
# uses a probabilistic increment with logarithmic behavior. Given the value
|
|
# of the old counter, when a key is accessed, the counter is incremented in
|
|
# this way:
|
|
#
|
|
# 1. A random number R between 0 and 1 is extracted.
|
|
# 2. A probability P is calculated as 1/(old_value*lfu_log_factor+1).
|
|
# 3. The counter is incremented only if R < P.
|
|
#
|
|
# The default lfu-log-factor is 10. This is a table of how the frequency
|
|
# counter changes with a different number of accesses with different
|
|
# logarithmic factors:
|
|
#
|
|
# +--------+------------+------------+------------+------------+------------+
|
|
# | factor | 100 hits | 1000 hits | 100K hits | 1M hits | 10M hits |
|
|
# +--------+------------+------------+------------+------------+------------+
|
|
# | 0 | 104 | 255 | 255 | 255 | 255 |
|
|
# +--------+------------+------------+------------+------------+------------+
|
|
# | 1 | 18 | 49 | 255 | 255 | 255 |
|
|
# +--------+------------+------------+------------+------------+------------+
|
|
# | 10 | 10 | 18 | 142 | 255 | 255 |
|
|
# +--------+------------+------------+------------+------------+------------+
|
|
# | 100 | 8 | 11 | 49 | 143 | 255 |
|
|
# +--------+------------+------------+------------+------------+------------+
|
|
#
|
|
# NOTE: The above table was obtained by running the following commands:
|
|
#
|
|
# redis-benchmark -n 1000000 incr foo
|
|
# redis-cli object freq foo
|
|
#
|
|
# NOTE 2: The counter initial value is 5 in order to give new objects a chance
|
|
# to accumulate hits.
|
|
#
|
|
# The counter decay time is the time, in minutes, that must elapse in order
|
|
# for the key counter to be divided by two (or decremented if it has a value
|
|
# less <= 10).
|
|
#
|
|
# The default value for the lfu-decay-time is 1. A special value of 0 means to
|
|
# decay the counter every time it happens to be scanned.
|
|
#
|
|
# lfu-log-factor 10
|
|
# lfu-decay-time 1
|
|
|
|
########################### ACTIVE DEFRAGMENTATION #######################
|
|
#
|
|
# What is active defragmentation?
|
|
# -------------------------------
|
|
#
|
|
# Active (online) defragmentation allows a Redis server to compact the
|
|
# spaces left between small allocations and deallocations of data in memory,
|
|
# thus allowing to reclaim back memory.
|
|
#
|
|
# Fragmentation is a natural process that happens with every allocator (but
|
|
# less so with Jemalloc, fortunately) and certain workloads. Normally a server
|
|
# restart is needed in order to lower the fragmentation, or at least to flush
|
|
# away all the data and create it again. However thanks to this feature
|
|
# implemented by Oran Agra for Redis 4.0 this process can happen at runtime
|
|
# in a "hot" way, while the server is running.
|
|
#
|
|
# Basically when the fragmentation is over a certain level (see the
|
|
# configuration options below) Redis will start to create new copies of the
|
|
# values in contiguous memory regions by exploiting certain specific Jemalloc
|
|
# features (in order to understand if an allocation is causing fragmentation
|
|
# and to allocate it in a better place), and at the same time, will release the
|
|
# old copies of the data. This process, repeated incrementally for all the keys
|
|
# will cause the fragmentation to drop back to normal values.
|
|
#
|
|
# Important things to understand:
|
|
#
|
|
# 1. This feature is disabled by default, and only works if you compiled Redis
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# to use the copy of Jemalloc we ship with the source code of Redis.
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# This is the default with Linux builds.
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#
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# 2. You never need to enable this feature if you don't have fragmentation
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# issues.
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#
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# 3. Once you experience fragmentation, you can enable this feature when
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# needed with the command "CONFIG SET activedefrag yes".
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#
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# The configuration parameters are able to fine tune the behavior of the
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# defragmentation process. If you are not sure about what they mean it is
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# a good idea to leave the defaults untouched.
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# Active defragmentation is disabled by default
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# activedefrag no
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# Minimum amount of fragmentation waste to start active defrag
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# active-defrag-ignore-bytes 100mb
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# Minimum percentage of fragmentation to start active defrag
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# active-defrag-threshold-lower 10
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# Maximum percentage of fragmentation at which we use maximum effort
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# active-defrag-threshold-upper 100
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# Minimal effort for defrag in CPU percentage, to be used when the lower
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# threshold is reached
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# active-defrag-cycle-min 1
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# Maximal effort for defrag in CPU percentage, to be used when the upper
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# threshold is reached
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# active-defrag-cycle-max 25
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# Maximum number of set/hash/zset/list fields that will be processed from
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# the main dictionary scan
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# active-defrag-max-scan-fields 1000
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# Jemalloc background thread for purging will be enabled by default
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jemalloc-bg-thread yes
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# It is possible to pin different threads and processes of Redis to specific
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# CPUs in your system, in order to maximize the performances of the server.
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# This is useful both in order to pin different Redis threads in different
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# CPUs, but also in order to make sure that multiple Redis instances running
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# in the same host will be pinned to different CPUs.
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#
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# Normally you can do this using the "taskset" command, however it is also
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# possible to this via Redis configuration directly, both in Linux and FreeBSD.
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#
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# You can pin the server/IO threads, bio threads, aof rewrite child process, and
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# the bgsave child process. The syntax to specify the cpu list is the same as
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# the taskset command:
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#
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# Set redis server/io threads to cpu affinity 0,2,4,6:
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# server_cpulist 0-7:2
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#
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# Set bio threads to cpu affinity 1,3:
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# bio_cpulist 1,3
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#
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# Set aof rewrite child process to cpu affinity 8,9,10,11:
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# aof_rewrite_cpulist 8-11
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#
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# Set bgsave child process to cpu affinity 1,10,11
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# bgsave_cpulist 1,10-11
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# In some cases redis will emit warnings and even refuse to start if it detects
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# that the system is in bad state, it is possible to suppress these warnings
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# by setting the following config which takes a space delimited list of warnings
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# to suppress
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#
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# ignore-warnings ARM64-COW-BUG
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