cronjob_docker_cleanup.sh

#!/bin/bash

#
# This script maintained at https://gist.github.com/jcfr/0bb9b695a5f1511a4b66f9e872d44743
#

#
# Source: https://lebkowski.name/docker-volumes/#recap
#

echo "Job started at: $(date +'%T %D %Z')"

# remove exited containers:
docker ps --filter status=dead --filter status=exited -aq | xargs -r docker rm -v

# remove unused images:
docker images --no-trunc | grep '<none>' | awk '{ print $3 }' | xargs -r docker rmi

# remove unused volumes:
docker volume ls -qf dangling=true | xargs -r docker volume rm

echo "Job completed at: $(date +'%T %D %Z')"