Some way to clean up / identify contents of /var/lib/docker/overlay

General
52

Docker by default does not limit the log file size, a small docker at my company runs over a year and accumulates 70Gb of log and blows up our disk. Instead of deleting the log file and doing some magic tricks, you should always keep the log file small. I list below some method to keep your Docker’s log managable.

  1. If you use docker-cli, add --log-opt to your docker run command:
    --log-opt max-size=10m --log-opt max-file=5

  2. If you use docker-compose, add the logging configuration:

<service_name>
  logging:
	max-size: "10m"
	max-file: "5"
  1. If you are lazy, you can add the default logging configuration to the Docker daemon /etc/docker/daemon.json, but make sure to setup for a new machine:
{
  "log-opts": {
    "max-size": "10m",
    "max-file": "5"
  }
}

Reference: Configure logging drivers | Docker Documentation