telegraf/plugins/inputs/syslog/README.md

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# Syslog Input Plugin
The syslog plugin listens for syslog messages transmitted over
[UDP](https://tools.ietf.org/html/rfc5426) or
[TCP](https://tools.ietf.org/html/rfc5425).
Syslog messages should be formatted according to
[RFC 5424](https://tools.ietf.org/html/rfc5424).
### Configuration
```toml
[[inputs.syslog]]
## Specify an ip or hostname with port - eg., tcp://localhost:6514, tcp://10.0.0.1:6514
## Protocol, address and port to host the syslog receiver.
## If no host is specified, then localhost is used.
## If no port is specified, 6514 is used (RFC5425#section-4.1).
server = "tcp://:6514"
## TLS Config
# tls_allowed_cacerts = ["/etc/telegraf/ca.pem"]
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Period between keep alive probes.
## 0 disables keep alive probes.
## Defaults to the OS configuration.
## Only applies to stream sockets (e.g. TCP).
# keep_alive_period = "5m"
## Maximum number of concurrent connections (default = 0).
## 0 means unlimited.
## Only applies to stream sockets (e.g. TCP).
# max_connections = 1024
## Read timeout is the maximum time allowed for reading a single message (default = 5s).
## 0 means unlimited.
# read_timeout = "5s"
## Whether to parse in best effort mode or not (default = false).
## By default best effort parsing is off.
# best_effort = false
## Character to prepend to SD-PARAMs (default = "_").
## A syslog message can contain multiple parameters and multiple identifiers within structured data section.
## Eg., [id1 name1="val1" name2="val2"][id2 name1="val1" nameA="valA"]
## For each combination a field is created.
## Its name is created concatenating identifier, sdparam_separator, and parameter name.
# sdparam_separator = "_"
```
#### Best Effort
The [`best_effort`](https://github.com/influxdata/go-syslog#best-effort-mode)
option instructs the parser to extract partial but valid info from syslog
messages. If unset only full messages will be collected.
#### Rsyslog Integration
Rsyslog can be configured to forward logging messages to Telegraf by configuring
[remote logging](https://www.rsyslog.com/doc/v8-stable/configuration/actions.html#remote-machine).
Most system are setup with a configuration split between `/etc/rsyslog.conf`
and the files in the `/etc/rsyslog.d/` directory, it is recommended to add the
new configuration into the config directory to simplify updates to the main
config file.
Add the following lines to `/etc/rsyslog.d/50-telegraf.conf` making
adjustments to the target address as needed:
```
$ActionQueueType LinkedList # use asynchronous processing
$ActionQueueFileName srvrfwd # set file name, also enables disk mode
$ActionResumeRetryCount -1 # infinite retries on insert failure
$ActionQueueSaveOnShutdown on # save in-memory data if rsyslog shuts down
# forward over tcp with octet framing according to RFC 5425
*.* @@(o)127.0.0.1:6514;RSYSLOG_SyslogProtocol23Format
# uncomment to use udp according to RFC 5424
#*.* @127.0.0.1:6514;RSYSLOG_SyslogProtocol23Format
```
You can alternately use `advanced` format (aka RainerScript):
```
# forward over tcp with octet framing according to RFC 5425
action(type="omfwd" Protocol="tcp" TCP_Framing="octet-counted" Target="127.0.0.1" Port="6514" Template="RSYSLOG_SyslogProtocol23Format")
# uncomment to use udp according to RFC 5424
#action(type="omfwd" Protocol="udp" Target="127.0.0.1" Port="6514" Template="RSYSLOG_SyslogProtocol23Format")
```
To complete TLS setup please refer to [rsyslog docs](https://www.rsyslog.com/doc/v8-stable/tutorials/tls.html).
### Metrics
- syslog
- tags
- severity (string)
- facility (string)
- hostname (string)
- appname (string)
- fields
- version (integer)
- severity_code (integer)
- facility_code (integer)
- timestamp (integer): the time recorded in the syslog message
- procid (string)
- msgid (string)
- sdid (bool)
- *Structured Data* (string)
- timestamp: the time the messages was received
#### Structured Data
Structured data produces field keys by combining the `SD_ID` with the `PARAM_NAME` combined using the `sdparam_separator` as in the following example:
```
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...
```
```
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
```
### Troubleshooting
You can send debugging messages directly to the input plugin using netcat:
```sh
# TCP with octet framing
echo "57 <13>1 2018-10-01T12:00:00.0Z example.org root - - - test" | nc 127.0.0.1 6514
# UDP
echo "<13>1 2018-10-01T12:00:00.0Z example.org root - - - test" | nc -u 127.0.0.1 6514
```
#### RFC3164
RFC3164 encoded messages are not currently supported. You may see the following error if a message encoded in this format:
```
E! Error in plugin [inputs.syslog]: expecting a version value in the range 1-999 [col 5]
```
You can use rsyslog to translate RFC3164 syslog messages into RFC5424 format.