Remove dangling container images safely

remove-dangling-images-safely.sh

#!/bin/bash

# naive way
docker system prune -a -f

# ... or

# simple way
if [ $(echo -n $(docker images -f "dangling=true" -q) | wc -m) -gt 0 ]; then docker rmi -f $(docker images -f "dangling=true" -q); else echo "No Dangling container images"; fi

# ... or

# Remove exited containers
EXITED_CONTAINERS=$(docker ps -a -f status=exited -q)
if [ ! -z "${EXITED_CONTAINERS}" ]
then
    docker rm ${EXITED_CONTAINERS} &2>1
    echo "Remove exited containers."
else
    echo "...No exited containers."
fi

# Remove docker dangling images
DANGLING_IMAGES=$(docker images -f dangling=true -q)
if [ ! -z "${DANGLING_IMAGES}" ]
then
    docker rmi ${DANGLING_IMAGES} &2>1
    echo "Remove dangling images."
else
    echo "...No dangling images."
fi

# Remove docker dangling volumes
DANGLING_VOLUMES=$(docker volume ls -f dangling=true -q)
if [ ! -z "${DANGLING_VOLUMES}" ]
then
    docker volume rm ${DANGLING_VOLUMES} &2>1
    echo "Remove dangling volumes."
else
    echo "...No dangling volumes."
fi

# Remove unused images
docker image prune -a -f