Syslog Destinations

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Logs

Use Observability Pipelines’ syslog destinations to send logs to rsyslog or syslog-ng.

Setup

Set up the rsyslog or syslog-ng destination and its environment variables when you set up a pipeline. The information below is configured in the pipelines UI.

Set up the destination

The rsyslog and syslog-ng destinations support the RFC5424 format.

The rsyslog and syslog-ng destinations match these log fields to the following Syslog fields:

Log EventSYSLOG FIELDDefault
log[“message”]MESSAGENIL
log[“procid”]PROCIDThe running Worker’s process ID.
log[“appname”]APP-NAMEobservability_pipelines
log[“facility”]FACILITY8 (log_user)
log[“msgid”]MSGIDNIL
log[“severity”]SEVERITYinfo
log[“host”]HOSTNAMENIL
log[“timestamp”]TIMESTAMPCurrent UTC time.

The following destination settings are optional:

  1. Toggle the switch to enable TLS. If you enable TLS, the following certificate and key files are required:
    • Server Certificate Path: The path to the certificate file that has been signed by your Certificate Authority (CA) Root File in DER or PEM (X.509).
    • CA Certificate Path: The path to the certificate file that is your Certificate Authority (CA) Root File in DER or PEM (X.509).
    • Private Key Path: The path to the .key private key file that belongs to your Server Certificate Path in DER or PEM (PKCS#8) format.
  2. Enter the number of seconds to wait before sending TCP keepalive probes on an idle connection.
  3. Optionally, toggle the switch to enable Buffering Options. Enable a configurable buffer on your destination to ensure intermittent latency or an outage at the destination doesn’t create immediate backpressure, and allow events to continue to be ingested from your source. Disk buffers can also increase pipeline durability by writing logs to disk, ensuring buffered logs persist through a Worker restart. See Configurable buffers for destinations for more information.
    • If left unconfigured, your destination uses a memory buffer with a capacity of 500 events.
    • To configure a buffer on your destination:
      1. Select the buffer type you want to set (Memory or Disk).
      2. Enter the buffer size and select the unit.
        • Maximum memory buffer size is 128 GB.
        • Maximum disk buffer size is 500 GB.

Set the environment variables

  • The rsyslog or syslog-ng endpoint URL. For example, 127.0.0.1:9997.
    • The Observability Pipelines Worker sends logs to this address and port.
    • Stored in the environment variable DD_OP_DESTINATION_SYSLOG_ENDPOINT_URL.
  • The ryslog or syslog-ng TLS passphrase (when enabled):
    • Stored in the environment variable DD_OP_DESTINATION_SYSLOG_KEY_PASS.

How the destination works

Event batching

The rsyslog and syslog-ng destinations do not batch events.