Update syslog docs and add to changelog and readme
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Daniel Nelson
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@ -19,6 +19,7 @@
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- [jti_openconfig_telemetry](./plugins/inputs/jti_openconfig_telemetry/README.md) - Contributed by @ajhai
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- [mcrouter](./plugins/inputs/mcrouter/README.md) - Contributed by @cthayer
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- [nvidia_smi](./plugins/inputs/nvidia_smi/README.md) - Contributed by @jackzampolin
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- [syslog](./plugins/inputs/syslog/README.md) - Contributed by @influxdata
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### New Processors
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@ -57,7 +58,8 @@
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- [#3969](https://github.com/influxdata/telegraf/pull/3969): Add option to unbound module to use threads as tags.
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- [#4183](https://github.com/influxdata/telegraf/pull/4183): Add support for TLS and username/password auth to aerospike input.
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- [#4190](https://github.com/influxdata/telegraf/pull/4190): Add special syslog timestamp parser to grok parser that uses current year.
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-
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- [#4181](https://github.com/influxdata/telegraf/pull/4181): Add syslog input plugin.
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### Bugfixes
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- [#4018](https://github.com/influxdata/telegraf/pull/4018): Write to working file outputs if any files are not writeable.
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@ -211,6 +211,7 @@ configuration options.
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* [snmp_legacy](./plugins/inputs/snmp_legacy)
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* [solr](./plugins/inputs/solr)
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* [sql server](./plugins/inputs/sqlserver) (microsoft)
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* [syslog](./plugins/inputs/syslog)
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* [teamspeak](./plugins/inputs/teamspeak)
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* [tomcat](./plugins/inputs/tomcat)
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* [twemproxy](./plugins/inputs/twemproxy)
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@ -1,10 +1,11 @@
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# syslog input plugin
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# Syslog Input Plugin
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Collects syslog messages as per RFC5425 or RFC5426.
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The syslog plugin listens for syslog messages transmitted over
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[UDP](https://tools.ietf.org/html/rfc5426) or
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[TCP](https://tools.ietf.org/html/rfc5425).
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It can act as a syslog transport receiver over TLS (or TCP) - ie., RFC5425 - or over UDP - ie., RFC5426.
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This plugin listens for syslog messages following RFC5424 format. When received it parses them extracting metrics.
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Syslog messages should be formatted according to
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[RFC 5424](https://tools.ietf.org/html/rfc5424).
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### Configuration
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@ -48,72 +49,50 @@ This plugin listens for syslog messages following RFC5424 format. When received
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# sdparam_separator = "_"
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```
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#### Other configs
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#### Best Effort
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Other available configurations are:
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- `keep_alive_period`, `max_connections` for stream sockets
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- `read_timeout`
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- `best_effort` to tell the parser to work until it is able to do and extract partial but valid info (more [here](https://github.com/influxdata/go-syslog#best-effort-mode))
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- `sdparam_separator` to choose how to separate structured data param name from its structured data identifier
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The [`best_effort`](https://github.com/influxdata/go-syslog#best-effort-mode)
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option instructs the parser to extract partial but valid info from syslog
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messages. If unset only full messages will be collected.
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### Metrics
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- syslog
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- fields
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- **version** (`uint16`)
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- **severity_code** (`int`)
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- **facility_code** (`int`)
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- timestamp (`int`)
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- procid (`string`)
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- msgid (`string`)
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- *sdid* (`bool`)
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- *sdid . sdparam_separator . sdparam_name* (`string`)
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- tags
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- **severity** (`string`)
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- **facility** (`string`)
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- hostname (`string`)
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- appname (`string`)
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- severity (string)
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- facility (string)
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- hostname (string)
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- appname (string)
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- fields
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- version (integer)
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- severity_code (integer)
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- facility_code (integer)
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- timestamp (integer)
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- procid (string)
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- msgid (string)
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- sdid (bool)
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- *Structured Data* (string)
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The name of fields in _italic_ corresponds to their runtime value.
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### Rsyslog Integration
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The fields/tags which name is in **bold** will always be present when a valid Syslog message has been received.
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Rsyslog can be configured to forward logging messages to Telegraf by configuring
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[remote logging](https://www.rsyslog.com/doc/v8-stable/configuration/actions.html#remote-machine).
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### RSYSLOG integration
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The following instructions illustrate how to configure a syslog transport sender as per RFC5425 - ie., using the octect framing technique - via RSYSLOG.
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Install `rsyslog`.
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Give it a configuration - ie., `/etc/rsyslog.conf`.
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Most system are setup with a configuration split between `/etc/rsyslog.conf`
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and the files in the `/etc/rsyslog.d/` directory, it is recommended to add the
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new configuration into the config directory to simplify updates to the main
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config file.
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Add the following lines to `/etc/rsyslog.d/50-telegraf.conf` making
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adjustments to the target address as needed:
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```
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$ModLoad imuxsock # provides support for local system logging
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$ModLoad imklog # provides kernel logging support
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$ModLoad immark # provides heart-beat logs
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$FileOwner root
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$FileGroup root
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$FileCreateMode 0640
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$DirCreateMode 0755
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$Umask 0022
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$WorkDirectory /var/spool/rsyslog # default location for work (spool) files
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$ActionQueueType LinkedList # use asynchronous processing
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$ActionQueueFileName srvrfwd # set file name, also enables disk mode
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$ActionResumeRetryCount -1 # infinite retries on insert failure
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$ActionQueueSaveOnShutdown on # save in-memory data if rsyslog shuts down
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$IncludeConfig /etc/rsyslog.d/*.conf
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```
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Specify you want the octet framing technique enabled and the format of each syslog message to follow the RFC5424.
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Create a file - eg., `/etc/rsyslog.d/50-default.conf` - containing:
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```
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# forward over tcp with octet framing according to RFC 5425
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*.* @@(o)127.0.0.1:6514;RSYSLOG_SyslogProtocol23Format
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```
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To complete the TLS setup please refer to [rsyslog docs](https://www.rsyslog.com/doc/v8-stable/tutorials/tls.html).
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Notice that this configuration tells `rsyslog` to broadcast messages to `127.0.0.1>6514`.
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So you have to configure this plugin accordingly.
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To complete TLS setup please refer to [rsyslog docs](https://www.rsyslog.com/doc/v8-stable/tutorials/tls.html).
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