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Syslog Input Plugin

The syslog plugin listens for syslog messages transmitted over UDP or TCP.

Syslog messages should be formatted according to RFC 5424.

Configuration

[[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 (default = 500ms).
  ## 0 means unlimited.
  # read_timeout = 500ms

  ## 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 option instructs the parser to extract partial but valid info from syslog messages. If unset only full messages will be collected.

Metrics

  • syslog
    • tags
      • severity (string)
      • facility (string)
      • hostname (string)
      • appname (string)
    • fields
      • version (integer)
      • severity_code (integer)
      • facility_code (integer)
      • timestamp (integer)
      • procid (string)
      • msgid (string)
      • sdid (bool)
      • Structured Data (string)

Rsyslog Integration

Rsyslog can be configured to forward logging messages to Telegraf by configuring remote logging.

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

To complete TLS setup please refer to rsyslog docs.