Script to delete exited containers and untagged/unused images from docker

docker-cleanup

#! /bin/bash

set -o errexit

echo "Removing exited docker containers..."
docker ps -a -f status=exited -q | xargs -r docker rm -v

# Do not remove dangling images they may still be in use
#echo "Removing dangling images..."
#docker images --no-trunc -q -f dangling=true | xargs -r docker rmi

echo "Removing dangling volumes..."
docker volume ls -qf dangling=true | xargs -r docker volume rm

echo "Removing unused docker images..."
images=($(docker images --digests | tail -n +2 | awk '{
  if ($1!="<none>") {
    img_id=$1;

    if($2!="<none>")
      img_id=img_id":"$2;
    if($3!="<none>")
      img_id=img_id"@"$3;
  } else {
    img_id=$4;
  }
  print img_id}' | sed -e 's/:latest//'))
containers=($(docker ps -a | tail -n +2 | awk '{print $2}'))
  
containers_reg=" ${containers[*]} "
remove=()

for item in ${images[@]}; do
  if [[ ! $containers_reg =~ " $item " ]]; then
    remove+=($item)
  fi
done

remove_images=" ${remove[*]} "

echo ${remove_images} | xargs -r docker rmi
echo "Done"

Updated:

• Do not remove dangling images they may still be in use
• Fix for dangling images (the ones that appear as <none>)