CODEWITHSUNDEEP
dockerunixsyslog
Xaser
Xaser

Reputation: 2146

Docker daemon writing to syslog but why

I'm running a docker CE setup and according to docker info the active logger is json-file. Nevertheless, my syslog is getting spammed with logs about NetworDB

Aug 21 23:45:17 myhost dockerd[859]: time="2019-08-21T23:45:17.488796292+02:00" level=info msg="NetworkDB stats myhost(68894b27f787) - netID:tm84fou4w4x98tgpqv19femay leaving:false netPeers:1 entries:6 Queue qLen:0 netMsg/s:0"

where is this message coming from? How can i configure it / disable it?

Upvotes: 0

Views: 1921

Answers (1)

larsks
larsks

Reputation: 311288

The active logger you see in docker info refers to the log driver used to collect container logs. What you see is a log message from dockerd itself.

Assuming that your dockerd is started by systemd, the logs show up in syslog because dockerd writes them to stdout/stderr and systemd collects the output and writes it to the system log. You have a few mechanisms to deal with this:

  • Reduce Docker's logging verbosity by setting the --log-level command line option:

    dockerd --log-level=warn ...

    (You would probably need to modify the docker.service unit to add this parameter, ideally through the use of a drop-in configuration file).

  • You can redirect the logs to a file instead by setting the StandardOutput parameter in the docker.service unit (using a drop-in as above).

  • You can use a syslog daemon with filtering capabilities (like syslog-ng or rsyslog) to suppress the messages or redirect them to a different file from the main log.

Personally, I wouldn't bother with any of the above: it is unlikely that the log output from dockerd is causing a real problem, and if a problem crops up it's better to have too many logs rather than not enough.

Upvotes: 1

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