Docker disk maintenance

docker-disk-maintenance.sh

#!/bin/bash

# References: https://lebkowski.name/docker-volumes/
# https://github.com/docker/docker/issues/18601

set -e 
export JQ=/tmp/jq

if [ ! -e  $JQ ]
  then
      wget -O $JQ https://s3.amazonaws.com/grovo-ops-public/jq-linux64
      chmod a+x $JQ
fi

# 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:
find '/var/lib/docker/volumes/' -mindepth 1 -maxdepth 1 -type d | grep -vFf \
  <(docker ps -aq | xargs docker inspect | $JQ -r '.[] | .Mounts | .[] | .Name | select(.)') \
  | xargs -r rm -fr