143 lines
5.3 KiB
Markdown
143 lines
5.3 KiB
Markdown
# Syslog Input Plugin
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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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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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```toml
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[[inputs.syslog]]
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## Specify an ip or hostname with port - eg., tcp://localhost:6514, tcp://10.0.0.1:6514
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## Protocol, address and port to host the syslog receiver.
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## If no host is specified, then localhost is used.
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## If no port is specified, 6514 is used (RFC5425#section-4.1).
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server = "tcp://:6514"
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## TLS Config
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# tls_allowed_cacerts = ["/etc/telegraf/ca.pem"]
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# tls_cert = "/etc/telegraf/cert.pem"
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# tls_key = "/etc/telegraf/key.pem"
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## Period between keep alive probes.
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## 0 disables keep alive probes.
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## Defaults to the OS configuration.
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## Only applies to stream sockets (e.g. TCP).
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# keep_alive_period = "5m"
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## Maximum number of concurrent connections (default = 0).
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## 0 means unlimited.
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## Only applies to stream sockets (e.g. TCP).
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# max_connections = 1024
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## Read timeout is the maximum time allowed for reading a single message (default = 5s).
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## 0 means unlimited.
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# read_timeout = "5s"
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## Whether to parse in best effort mode or not (default = false).
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## By default best effort parsing is off.
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# best_effort = false
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## Character to prepend to SD-PARAMs (default = "_").
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## A syslog message can contain multiple parameters and multiple identifiers within structured data section.
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## Eg., [id1 name1="val1" name2="val2"][id2 name1="val1" nameA="valA"]
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## For each combination a field is created.
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## Its name is created concatenating identifier, sdparam_separator, and parameter name.
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# sdparam_separator = "_"
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```
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#### Best Effort
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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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#### Rsyslog Integration
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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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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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$ActionQueueType LinkedList # use asynchronous processing
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$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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# 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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# uncomment to use udp according to RFC 5424
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#*.* @127.0.0.1:6514;RSYSLOG_SyslogProtocol23Format
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```
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You can alternately use `advanced` format (aka RainerScript):
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```
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# forward over tcp with octet framing according to RFC 5425
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action(type="omfwd" Protocol="tcp" TCP_Framing="octet-counted" Target="127.0.0.1" Port="6514" Template="RSYSLOG_SyslogProtocol23Format")
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# uncomment to use udp according to RFC 5424
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#action(type="omfwd" Protocol="udp" Target="127.0.0.1" Port="6514" Template="RSYSLOG_SyslogProtocol23Format")
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```
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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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### Metrics
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- syslog
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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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- 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): the time recorded in the syslog message
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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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- timestamp: the time the messages was received
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#### Structured Data
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Structured data produces field keys by combining the `SD_ID` with the `PARAM_NAME` combined using the `sdparam_separator` as in the following example:
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```
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170 <165>1 2018-10-01:14:15.000Z mymachine.example.com evntslog - ID47 [exampleSDID@32473 iut="3" eventSource="Application" eventID="1011"] An application event log entry...
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```
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```
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syslog,appname=evntslog,facility=local4,hostname=mymachine.example.com,severity=notice exampleSDID@32473_eventID="1011",exampleSDID@32473_eventSource="Application",exampleSDID@32473_iut="3",facility_code=20i,message="An application event log entry...",msgid="ID47",severity_code=5i,timestamp=1065910455003000000i,version=1i 1538421339749472344
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```
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### Troubleshooting
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You can send debugging messages directly to the input plugin using netcat:
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```sh
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# TCP with octet framing
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echo "57 <13>1 2018-10-01T12:00:00.0Z example.org root - - - test" | nc 127.0.0.1 6514
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# UDP
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echo "<13>1 2018-10-01T12:00:00.0Z example.org root - - - test" | nc -u 127.0.0.1 6514
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```
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#### RFC3164
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RFC3164 encoded messages are not currently supported. You may see the following error if a message encoded in this format:
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```
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E! Error in plugin [inputs.syslog]: expecting a version value in the range 1-999 [col 5]
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```
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You can use rsyslog to translate RFC3164 syslog messages into RFC5424 format.
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