bash script to help docker clean up after itself

docker_cleanup.sh

#!/bin/bash
# this script can be scheduled to run daily at midnight by adding a cron job like the following:
# 0 0 * * * /root/docker_cleanup.sh
#
docker rm -v $(docker ps -a -q -f status=exited) | logger -t "docker_cleanup.sh"
docker rmi $(docker images -f "dangling=true" -q) | logger -t "docker_cleanup.sh"
docker volume rm $(docker volume ls -qf dangling=true) | logger -t "docker_cleanup.sh"