fluent-package logrotate configuration causes logrotate failure if fluentd has never run

[palash-gandhi]

fluent-package ships a logrotate configuration on a log file that is not guaranteed to exist.

$ cat /etc/logrotate.d/fluentd
/var/log/fluent/fluentd.log {
  daily
  rotate 30
  compress
  delaycompress
  notifempty
  create 640 _fluentd _fluentd
  sharedscripts
  postrotate
    pid=/var/run/fluent/fluentd.pid
    if [ -s "$pid" ]
    then
      kill -USR1 "$(cat $pid)"
    fi
  endscript
}

This can cause invocations of logrotate to fail with:

$ sudo logrotate /etc/logrotate.conf
error: stat of /var/log/fluent/fluentd.log failed: No such file or directory.

While not having fluentd running may not be a common scenario, I do believe this to be a bug in the package.

[palash-gandhi]

Also, could you explain how this logrotate configuration relates to the --log-rotate-age CLI argument to fluentd?

[daipom]

@palash-gandhi Thanks for your report! Sorry for our late response.

While not having fluentd running may not be a common scenario, I do believe this to be a bug in the package.

I see.
I don't know how to get around the error when Fluentd is not running and there is no log file yet.
What is the general approach?

[daipom]

Should we use missingok?

https://linux.die.net/man/8/logrotate

[daipom]

Also, could you explain how this logrotate configuration relates to the --log-rotate-age CLI argument to fluentd?

fluent-package RPM/DEB does not need to configure the log rotation options of Fluentd because fluent-package uses logrotate to manage the rotation.

[palash-gandhi]

Should we use missingok?

@daipom Thank you for your response. I have currently used this as a workaround for our systems and implementing this as a long-term fix makes sense.

[daipom]

Thanks!