mirror of https://github.com/sirupsen/logrus.git
Add instructions to use different log levels for local and syslog
This commit adds instructions to the syslog readme about how to send different log levels to local logging (`log.SetLevel`) and syslog hook. fixes #1369
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@ -9,7 +9,7 @@ the last thing you want from your Logging library (again...).
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This does not mean Logrus is dead. Logrus will continue to be maintained for
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security, (backwards compatible) bug fixes, and performance (where we are
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limited by the interface).
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limited by the interface).
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I believe Logrus' biggest contribution is to have played a part in today's
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widespread use of structured logging in Golang. There doesn't seem to be a
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@ -99,7 +99,7 @@ time="2015-03-26T01:27:38-04:00" level=fatal method=github.com/sirupsen/arcticcr
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```
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Note that this does add measurable overhead - the cost will depend on the version of Go, but is
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between 20 and 40% in recent tests with 1.6 and 1.7. You can validate this in your
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environment via benchmarks:
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environment via benchmarks:
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```
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go test -bench=.*CallerTracing
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```
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@ -317,6 +317,8 @@ log.SetLevel(log.InfoLevel)
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It may be useful to set `log.Level = logrus.DebugLevel` in a debug or verbose
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environment if your application has that.
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Note: If you want different log levels for global (`log.SetLevel(...)`) and syslog logging, please check the [syslog hook README](hooks/syslog/README.md#different-log-levels-for-local-and-remote-logging).
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#### Entries
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Besides the fields added with `WithField` or `WithFields` some fields are
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@ -37,3 +37,45 @@ func main() {
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}
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}
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```
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### Different log levels for local and remote logging
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By default `NewSyslogHook()` sends logs through the hook for all log levels. If you want to have
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different log levels between local logging and syslog logging (i.e. respect the `priority` argument
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passed to `NewSyslogHook()`), you need to implement the `logrus_syslog.SyslogHook` interface
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overriding `Levels()` to return only the log levels you're interested on.
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The following example shows how to log at **DEBUG** level for local logging and **WARN** level for
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syslog logging:
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```go
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package main
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import (
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"log/syslog"
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log "github.com/sirupsen/logrus"
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logrus_syslog "github.com/sirupsen/logrus/hooks/syslog"
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)
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type customHook struct {
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*logrus_syslog.SyslogHook
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}
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func (h *customHook) Levels() []log.Level {
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return []log.Level{log.WarnLevel}
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}
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func main() {
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log.SetLevel(log.DebugLevel)
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hook, err := logrus_syslog.NewSyslogHook("tcp", "localhost:5140", syslog.LOG_WARNING, "myTag")
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if err != nil {
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panic(err)
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}
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log.AddHook(&customHook{hook})
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//...
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}
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```
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