sensor log files grow without bound

[djanderson]

Docker captures all stdout and stderr output from all containers and stores them in a local log file. It does no log rotation, and the file is allowed to grow without bound. Sooner or later, that will eat up all the disk space on a sensor.

We need to look into solutions for log rotation and setting a cap on how long or much big in size docker keeps logs.

[djanderson]

An easy solution for this is to install the following file:

/etc/logrotate.d/docker-container

/var/lib/docker/containers/*/*.log {
  rotate 7
  daily
  compress
  size=1M
  missingok
  delaycompress
  copytruncate
}

On my system (Ubuntu) logrotate is already run daily by cron:

$ grep -r logrotate /etc/cron*
...
/etc/cron.daily/logrotate:/usr/sbin/logrotate /etc/logrotate.conf

@bradeales, I might need some helping adding this to puppet.