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---
date: "2019-04-02T17:06:00+01:00"
title: "Advanced: Logging Configuration"
slug: "logging-configuration"
weight: 55
toc: false
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draft: false
menu:
sidebar:
parent: "advanced"
name: "Logging Configuration"
weight: 55
identifier: "logging-configuration"
---
# Logging Configuration
The logging framework has been revamped in Gitea 1.9.0.
**Table of Contents**
{{< toc >}}
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## Log Groups
The fundamental thing to be aware of in Gitea is that there are several
log groups:
- The "Default" logger
- The Router logger
- The Access logger
- The XORM logger
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There is also the go log logger.
### The go log logger
Go provides its own extremely basic logger in the `log` package,
however, this is not sufficient for our purposes as it does not provide
a way of logging at multiple levels, nor does it provide a good way of
controlling where these logs are logged except through setting of a
writer.
We have therefore redirected this logger to our Default logger, and we
will log anything that is logged using the go logger at the INFO level.
### The "Default" logger
Calls to `log.Info`, `log.Debug`, `log.Error` etc. from the `code.gitea.io/gitea/modules/log` package will log to this logger.
You can configure the outputs of this logger by setting the `MODE`
value in the `[log]` section of the configuration.
Each output sublogger is configured in a separate `[log.sublogger.default]`
which inherits from the sublogger `[log.sublogger]` section and from the
generic `[log]` section, but there are certain default values. These will
not be inherited from the `[log]` section:
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- `FLAGS` is `stdflags` (Equal to
`date,time,medfile,shortfuncname,levelinitial`)
- `FILE_NAME` will default to `%(ROOT_PATH)/gitea.log`
- `EXPRESSION` will default to `""`
- `PREFIX` will default to `""`
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The provider type of the sublogger can be set using the `MODE` value in
its subsection, but will default to the name. This allows you to have
multiple subloggers that will log to files.
### The "Router" logger
The Router logger has been substantially changed in v1.17. If you are using the router logger for fail2ban or other monitoring
you will need to update this configuration.
You can disable Router log by setting `DISABLE_ROUTER_LOG` or by setting all of its sublogger configurations to `none`.
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Move macaron to chi (#14293) Use [chi](https://github.com/go-chi/chi) instead of the forked [macaron](https://gitea.com/macaron/macaron). Since macaron and chi have conflicts with session share, this big PR becomes a have-to thing. According my previous idea, we can replace macaron step by step but I'm wrong. :( Below is a list of big changes on this PR. - [x] Define `context.ResponseWriter` interface with an implementation `context.Response`. - [x] Use chi instead of macaron, and also a customize `Route` to wrap chi so that the router usage is similar as before. - [x] Create different routers for `web`, `api`, `internal` and `install` so that the codes will be more clear and no magic . - [x] Use https://github.com/unrolled/render instead of macaron's internal render - [x] Use https://github.com/NYTimes/gziphandler instead of https://gitea.com/macaron/gzip - [x] Use https://gitea.com/go-chi/session which is a modified version of https://gitea.com/macaron/session and removed `nodb` support since it will not be maintained. **BREAK** - [x] Use https://gitea.com/go-chi/captcha which is a modified version of https://gitea.com/macaron/captcha - [x] Use https://gitea.com/go-chi/cache which is a modified version of https://gitea.com/macaron/cache - [x] Use https://gitea.com/go-chi/binding which is a modified version of https://gitea.com/macaron/binding - [x] Use https://github.com/go-chi/cors instead of https://gitea.com/macaron/cors - [x] Dropped https://gitea.com/macaron/i18n and make a new one in `code.gitea.io/gitea/modules/translation` - [x] Move validation form structs from `code.gitea.io/gitea/modules/auth` to `code.gitea.io/gitea/modules/forms` to avoid dependency cycle. - [x] Removed macaron log service because it's not need any more. **BREAK** - [x] All form structs have to be get by `web.GetForm(ctx)` in the route function but not as a function parameter on routes definition. - [x] Move Git HTTP protocol implementation to use routers directly. - [x] Fix the problem that chi routes don't support trailing slash but macaron did. - [x] `/api/v1/swagger` now will be redirect to `/api/swagger` but not render directly so that `APIContext` will not create a html render. Notices: - Chi router don't support request with trailing slash - Integration test `TestUserHeatmap` maybe mysql version related. It's failed on my macOS(mysql 5.7.29 installed via brew) but succeed on CI. Co-authored-by: 6543 <6543@obermui.de>
2021-01-26 16:36:53 +01:00
You can configure the outputs of this
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router log by setting the `ROUTER` value in the `[log]` section of the
configuration. `ROUTER` will default to `console` if unset and will default to same level as main logger.
The Router logger logs the following:
- `started` messages will be logged at TRACE level
- `polling`/`completed` routers will be logged at INFO
- `slow` routers will be logged at WARN
- `failed` routers will be logged at WARN
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The logging level for the router will default to that of the main configuration. Set `[log.<mode>.router]` `LEVEL` to change this.
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Each output sublogger for this logger is configured in
`[log.sublogger.router]` sections. There are certain default values
which will not be inherited from the `[log]` or relevant
`[log.sublogger]` sections:
- `FILE_NAME` will default to `%(ROOT_PATH)/router.log`
- `FLAGS` defaults to `date,time`
- `EXPRESSION` will default to `""`
- `PREFIX` will default to `""`
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NB: You can redirect the router logger to send its events to the Gitea
log using the value: `ROUTER = ,`
### The "Access" logger
The Access logger is a new logger for version 1.9. It provides a NCSA
Common Log compliant log format. It's highly configurable but caution
should be taken when changing its template. The main benefit of this
logger is that Gitea can now log accesses in a standard log format so
standard tools may be used.
You can enable this logger using `ENABLE_ACCESS_LOG`. Its outputs are
configured by setting the `ACCESS` value in the `[log]` section of the
configuration. `ACCESS` defaults to `file` if unset.
Each output sublogger for this logger is configured in
`[log.sublogger.access]` sections. There are certain default values
which will not be inherited from the `[log]` or relevant
`[log.sublogger]` sections:
- `FILE_NAME` will default to `%(ROOT_PATH)/access.log`
- `FLAGS` defaults to `` or None
- `EXPRESSION` will default to `""`
- `PREFIX` will default to `""`
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If desired the format of the Access logger can be changed by changing
the value of the `ACCESS_LOG_TEMPLATE`.
Please note, the access logger will log at `INFO` level, setting the
`LEVEL` of this logger to `WARN` or above will result in no access logs.
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NB: You can redirect the access logger to send its events to the Gitea
log using the value: `ACCESS = ,`
#### The ACCESS_LOG_TEMPLATE
This value represent a go template. It's default value is:
`{{.Ctx.RemoteAddr}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}\" \"{{.Ctx.Req.UserAgent}}"`
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The template is passed following options:
Move macaron to chi (#14293) Use [chi](https://github.com/go-chi/chi) instead of the forked [macaron](https://gitea.com/macaron/macaron). Since macaron and chi have conflicts with session share, this big PR becomes a have-to thing. According my previous idea, we can replace macaron step by step but I'm wrong. :( Below is a list of big changes on this PR. - [x] Define `context.ResponseWriter` interface with an implementation `context.Response`. - [x] Use chi instead of macaron, and also a customize `Route` to wrap chi so that the router usage is similar as before. - [x] Create different routers for `web`, `api`, `internal` and `install` so that the codes will be more clear and no magic . - [x] Use https://github.com/unrolled/render instead of macaron's internal render - [x] Use https://github.com/NYTimes/gziphandler instead of https://gitea.com/macaron/gzip - [x] Use https://gitea.com/go-chi/session which is a modified version of https://gitea.com/macaron/session and removed `nodb` support since it will not be maintained. **BREAK** - [x] Use https://gitea.com/go-chi/captcha which is a modified version of https://gitea.com/macaron/captcha - [x] Use https://gitea.com/go-chi/cache which is a modified version of https://gitea.com/macaron/cache - [x] Use https://gitea.com/go-chi/binding which is a modified version of https://gitea.com/macaron/binding - [x] Use https://github.com/go-chi/cors instead of https://gitea.com/macaron/cors - [x] Dropped https://gitea.com/macaron/i18n and make a new one in `code.gitea.io/gitea/modules/translation` - [x] Move validation form structs from `code.gitea.io/gitea/modules/auth` to `code.gitea.io/gitea/modules/forms` to avoid dependency cycle. - [x] Removed macaron log service because it's not need any more. **BREAK** - [x] All form structs have to be get by `web.GetForm(ctx)` in the route function but not as a function parameter on routes definition. - [x] Move Git HTTP protocol implementation to use routers directly. - [x] Fix the problem that chi routes don't support trailing slash but macaron did. - [x] `/api/v1/swagger` now will be redirect to `/api/swagger` but not render directly so that `APIContext` will not create a html render. Notices: - Chi router don't support request with trailing slash - Integration test `TestUserHeatmap` maybe mysql version related. It's failed on my macOS(mysql 5.7.29 installed via brew) but succeed on CI. Co-authored-by: 6543 <6543@obermui.de>
2021-01-26 16:36:53 +01:00
- `Ctx` is the `context.Context`
- `Identity` is the `SignedUserName` or `"-"` if the user is not logged
in
- `Start` is the start time of the request
Move macaron to chi (#14293) Use [chi](https://github.com/go-chi/chi) instead of the forked [macaron](https://gitea.com/macaron/macaron). Since macaron and chi have conflicts with session share, this big PR becomes a have-to thing. According my previous idea, we can replace macaron step by step but I'm wrong. :( Below is a list of big changes on this PR. - [x] Define `context.ResponseWriter` interface with an implementation `context.Response`. - [x] Use chi instead of macaron, and also a customize `Route` to wrap chi so that the router usage is similar as before. - [x] Create different routers for `web`, `api`, `internal` and `install` so that the codes will be more clear and no magic . - [x] Use https://github.com/unrolled/render instead of macaron's internal render - [x] Use https://github.com/NYTimes/gziphandler instead of https://gitea.com/macaron/gzip - [x] Use https://gitea.com/go-chi/session which is a modified version of https://gitea.com/macaron/session and removed `nodb` support since it will not be maintained. **BREAK** - [x] Use https://gitea.com/go-chi/captcha which is a modified version of https://gitea.com/macaron/captcha - [x] Use https://gitea.com/go-chi/cache which is a modified version of https://gitea.com/macaron/cache - [x] Use https://gitea.com/go-chi/binding which is a modified version of https://gitea.com/macaron/binding - [x] Use https://github.com/go-chi/cors instead of https://gitea.com/macaron/cors - [x] Dropped https://gitea.com/macaron/i18n and make a new one in `code.gitea.io/gitea/modules/translation` - [x] Move validation form structs from `code.gitea.io/gitea/modules/auth` to `code.gitea.io/gitea/modules/forms` to avoid dependency cycle. - [x] Removed macaron log service because it's not need any more. **BREAK** - [x] All form structs have to be get by `web.GetForm(ctx)` in the route function but not as a function parameter on routes definition. - [x] Move Git HTTP protocol implementation to use routers directly. - [x] Fix the problem that chi routes don't support trailing slash but macaron did. - [x] `/api/v1/swagger` now will be redirect to `/api/swagger` but not render directly so that `APIContext` will not create a html render. Notices: - Chi router don't support request with trailing slash - Integration test `TestUserHeatmap` maybe mysql version related. It's failed on my macOS(mysql 5.7.29 installed via brew) but succeed on CI. Co-authored-by: 6543 <6543@obermui.de>
2021-01-26 16:36:53 +01:00
- `ResponseWriter` is the `http.ResponseWriter`
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Caution must be taken when changing this template as it runs outside of
the standard panic recovery trap. The template should also be as simple
as it runs for every request.
### The "XORM" logger
The XORM logger is a long-standing logger that exists to collect XORM
log events. It is enabled by default but can be switched off by setting
`ENABLE_XORM_LOG` to `false` in the `[log]` section. Its outputs are
configured by setting the `XORM` value in the `[log]` section of the
configuration. `XORM` defaults to `,` if unset, meaning it is redirected
to the main Gitea log.
XORM will log SQL events by default. This can be changed by setting
the `LOG_SQL` value to `false` in the `[database]` section.
Each output sublogger for this logger is configured in
`[log.sublogger.xorm]` sections. There are certain default values
which will not be inherited from the `[log]` or relevant
`[log.sublogger]` sections:
- `FILE_NAME` will default to `%(ROOT_PATH)/xorm.log`
- `FLAGS` defaults to `date,time`
- `EXPRESSION` will default to `""`
- `PREFIX` will default to `""`
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## Log outputs
Gitea provides 4 possible log outputs:
- `console` - Log to `os.Stdout` or `os.Stderr`
- `file` - Log to a file
- `conn` - Log to a keep-alive TCP connection
- `smtp` - Log via email
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Certain configuration is common to all modes of log output:
- `LEVEL` is the lowest level that this output will log. This value
is inherited from `[log]` and in the case of the non-default loggers
from `[log.sublogger]`.
- `STACKTRACE_LEVEL` is the lowest level that this output will print
a stacktrace. This value is inherited.
- `MODE` is the mode of the log output. It will default to the sublogger
name. Thus `[log.console.router]` will default to `MODE = console`.
- `COLORIZE` will default to `true` for `console` as
described, otherwise it will default to `false`.
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### Non-inherited default values
There are several values which are not inherited as described above but
rather default to those specific to type of logger, these are:
`EXPRESSION`, `FLAGS`, `PREFIX` and `FILE_NAME`.
#### `EXPRESSION`
`EXPRESSION` represents a regular expression that log events must match to be logged by the sublogger. Either the log message, (with colors removed), must match or the `longfilename:linenumber:functionname` must match. NB: the whole message or string doesn't need to completely match.
Please note this expression will be run in the sublogger's goroutine
not the logging event subroutine. Therefore it can be complicated.
#### `FLAGS`
`FLAGS` represents the preceding logging context information that is
printed before each message. It is a comma-separated string set. The order of values does not matter.
Possible values are:
- `none` or `,` - No flags.
- `date` - the date in the local time zone: `2009/01/23`.
- `time` - the time in the local time zone: `01:23:23`.
- `microseconds` - microsecond resolution: `01:23:23.123123`. Assumes
time.
- `longfile` - full file name and line number: `/a/b/c/d.go:23`.
- `shortfile` - final file name element and line number: `d.go:23`.
- `funcname` - function name of the caller: `runtime.Caller()`.
- `shortfuncname` - last part of the function name. Overrides
`funcname`.
- `utc` - if date or time is set, use UTC rather than the local time
zone.
- `levelinitial` - Initial character of the provided level in brackets eg. `[I]` for info.
- `level` - Provided level in brackets `[INFO]`
- `medfile` - Last 20 characters of the filename - equivalent to
`shortfile,longfile`.
- `stdflags` - Equivalent to `date,time,medfile,shortfuncname,levelinitial`
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### Console mode
For loggers in console mode, `COLORIZE` will default to `true` if not
on windows, or the windows terminal can be set into ANSI mode or is a
cygwin or Msys pipe.
If `STDERR` is set to `true` the logger will use `os.Stderr` instead of
`os.Stdout`.
### File mode
The `FILE_NAME` defaults as described above. If set it will be relative
to the provided `ROOT_PATH` in the master `[log]` section.
Other values:
- `LOG_ROTATE`: **true**: Rotate the log files.
- `MAX_SIZE_SHIFT`: **28**: Maximum size shift of a single file, 28 represents 256Mb.
- `DAILY_ROTATE`: **true**: Rotate logs daily.
- `MAX_DAYS`: **7**: Delete the log file after n days
- `COMPRESS`: **true**: Compress old log files by default with gzip
- `COMPRESSION_LEVEL`: **-1**: Compression level
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### Conn mode
- `RECONNECT_ON_MSG`: **false**: Reconnect host for every single message.
- `RECONNECT`: **false**: Try to reconnect when connection is lost.
- `PROTOCOL`: **tcp**: Set the protocol, either "tcp", "unix" or "udp".
- `ADDR`: **:7020**: Sets the address to connect to.
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### SMTP mode
It is not recommended to use this logger to send general logging
messages. However, you could perhaps set this logger to work on `FATAL`.
- `USER`: User email address to send from.
- `PASSWD`: Password for the smtp server.
- `HOST`: **127.0.0.1:25**: The SMTP host to connect to.
- `RECEIVERS`: Email addresses to send to.
- `SUBJECT`: **Diagnostic message from Gitea**
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## Debugging problems
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When submitting logs in Gitea issues it is often helpful to submit
merged logs obtained by either by redirecting the console log to a file or
copying and pasting it. To that end it is recommended to set your logging to:
```ini
[database]
LOG_SQL = false ; SQL logs are rarely helpful unless we specifically ask for them
...
[log]
MODE = console
LEVEL = debug ; please set the level to debug when we are debugging a problem
ROUTER = console
COLORIZE = false ; this can be true if you can strip out the ansi coloring
```
Sometimes it will be helpful get some specific `TRACE` level logging restricted
to messages that match a specific `EXPRESSION`. Adjusting the `MODE` in the
`[log]` section to `MODE = console,traceconsole` to add a new logger output
`traceconsole` and then adding its corresponding section would be helpful:
```ini
[log.traceconsole] ; traceconsole here is just a name
MODE = console ; this is the output that the traceconsole writes to
LEVEL = trace
EXPRESSION = ; putting a string here will restrict this logger to logging only those messages that match this expression
```
(It's worth noting that log messages that match the expression at or above debug
level will get logged twice so don't worry about that.)
`STACKTRACE_LEVEL` should generally be left unconfigured (and hence kept at
`none`). There are only very specific occasions when it useful.
## Empty Configuration
The empty configuration is equivalent to:
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```ini
[log]
ROOT_PATH = %(GITEA_WORK_DIR)/log
MODE = console
LEVEL = Info
STACKTRACE_LEVEL = None
ENABLE_ACCESS_LOG = false
ENABLE_XORM_LOG = true
XORM = ,
[log.console]
MODE = console
LEVEL = %(LEVEL)
STACKTRACE_LEVEL = %(STACKTRACE_LEVEL)
FLAGS = stdflags
PREFIX =
COLORIZE = true # Or false if your windows terminal cannot color
```
This is equivalent to sending all logs to the console, with default go log being sent to the console log too.
## Releasing-and-Reopening, Pausing and Resuming logging
If you are running on Unix you may wish to release-and-reopen logs in order to use `logrotate` or other tools.
It is possible force Gitea to release and reopen it's logging files and connections by sending `SIGUSR1` to the
running process, or running `gitea manager logging release-and-reopen`.
Alternatively, you may wish to pause and resume logging - this can be accomplished through the use of the
`gitea manager logging pause` and `gitea manager logging resume` commands. Please note that whilst logging
is paused log events below INFO level will not be stored and only a limited number of events will be stored.
Logging may block, albeit temporarily, slowing Gitea considerably whilst paused - therefore it is
recommended that pausing only done for a very short period of time.
## Adding and removing logging whilst Gitea is running
It is possible to add and remove logging whilst Gitea is running using the `gitea manager logging add` and `remove` subcommands.
This functionality can only adjust running log systems and cannot be used to start the access or router loggers if they
were not already initialised. If you wish to start these systems you are advised to adjust the app.ini and (gracefully) restart
the Gitea service.
The main intention of these commands is to easily add a temporary logger to investigate problems on running systems where a restart
may cause the issue to disappear.
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## Log colorization
Logs to the console will be colorized by default when not running on
Windows. Terminal sniffing will occur on Windows and if it is
determined that we are running on a terminal capable of color we will
colorize.
Further, on \*nix it is becoming common to have file logs that are
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colored by default. Therefore file logs will be colorised by default
when not running on Windows.
You can switch on or off colorization by using the `COLORIZE` value.
From a development point of view. If you write
`log.Info("A %s string", "formatted")` the `formatted` part of the log
message will be Bolded on colorized logs.
You can change this by either rendering the formatted string yourself.
Or you can wrap the value in a `log.ColoredValue` struct.
The `log.ColoredValue` struct contains a pointer to value, a pointer to
string of bytes which should represent a color and second set of reset
bytes. Pointers were chosen to prevent copying of large numbers of
values. There are several helper methods:
- `log.NewColoredValue` takes a value and 0 or more color attributes
that represent the color. If 0 are provided it will default to a cached
bold. Note, it is recommended that color bytes constructed from
attributes should be cached if this is a commonly used log message.
- `log.NewColoredValuePointer` takes a pointer to a value, and
0 or more color attributes that represent the color.
- `log.NewColoredValueBytes` takes a value and a pointer to an array
of bytes representing the color.
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These functions will not double wrap a `log.ColoredValue`. They will
also set the `resetBytes` to the cached `resetBytes`.
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The `colorBytes` and `resetBytes` are not exported to prevent
accidental overwriting of internal values.
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## ColorFormat & ColorFormatted
Structs may implement the `log.ColorFormatted` interface by implementing the `ColorFormat(fmt.State)` function.
If a `log.ColorFormatted` struct is logged with `%-v` format, its `ColorFormat` will be used instead of the usual `%v`. The full `fmt.State` will be passed to allow implementers to look at additional flags.
In order to help implementers provide `ColorFormat` methods. There is a
`log.ColorFprintf(...)` function in the log module that will wrap values in `log.ColoredValue` and recognise `%-v`.
In general it is recommended not to make the results of this function too verbose to help increase its versatility. Usually this should simply be an `ID`:`Name`. If you wish to make a more verbose result, it is recommended to use `%-+v` as your marker.
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## Log Spoofing protection
In order to protect the logs from being spoofed with cleverly
constructed messages. Newlines are now prefixed with a tab and control
characters except those used in an ANSI CSI are escaped with a
preceding `\` and their octal value.
## Creating a new named logger group
Should a developer wish to create a new named logger, `NEWONE`. It is
recommended to add an `ENABLE_NEWONE_LOG` value to the `[log]`
section, and to add a new `NEWONE` value for the modes.
A function like `func newNewOneLogService()` is recommended to manage
construction of the named logger. e.g.
```go
func newNewoneLogService() {
EnableNewoneLog = Cfg.Section("log").Key("ENABLE_NEWONE_LOG").MustBool(false)
Cfg.Section("log").Key("NEWONE").MustString("file") // or console? or "," if you want to send this to default logger by default
if EnableNewoneLog {
options := newDefaultLogOptions()
options.filename = filepath.Join(LogRootPath, "newone.log")
options.flags = "stdflags"
options.bufferLength = Cfg.Section("log").Key("BUFFER_LEN").MustInt64(10000)
generateNamedLogger("newone", options)
}
}
```
You should then add `newOneLogService` to `NewServices()` in
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`modules/setting/setting.go`
## Using `logrotate` instead of built-in log rotation
Gitea includes built-in log rotation, which should be enough for most deployments. However, if you instead want to use the `logrotate` utility:
- Disable built-in log rotation by setting `LOG_ROTATE` to `false` in your `app.ini`.
- Install `logrotate`.
- Configure `logrotate` to match your deployment requirements, see `man 8 logrotate` for configuration syntax details. In the `postrotate/endscript` block send Gitea a `USR1` signal via `kill -USR1` or `kill -10` to the `gitea` process itself, or run `gitea manager logging release-and-reopen` (with the appropriate environment). Ensure that your configurations apply to all files emitted by Gitea loggers as described in the above sections.
- Always do `logrotate /etc/logrotate.conf --debug` to test your configurations.
- If you are using docker and are running from outside of the container you can use `docker exec -u $OS_USER $CONTAINER_NAME sh -c 'gitea manager logging release-and-reopen'` or `docker exec $CONTAINER_NAME sh -c '/bin/s6-svc -1 /etc/s6/gitea/'` or send `USR1` directly to the Gitea process itself.
The next `logrotate` jobs will include your configurations, so no restart is needed. You can also immediately reload `logrotate` with `logrotate /etc/logrotate.conf --force`.