Yet another docker cleanup script. Deletes stopped docker containers and untagged images, prints information about freed disk space.

docker-cleanup.sh

#!/bin/bash
#
# Cleans up docker files:
# - Deletes untagged docker images
# - Deletes stopped docker containers
# - Deletes long-running docker containers (use with care!)

set -e

if [ $# -eq 0 ]; then
    echo "Usage: $0 --stopped --long-running --untagged"
    exit 1
fi

output=echo
#output="logger -t docker-cleanup"

function delete_stopped_containers() {
    local containers=$(docker ps -q -f status=exited)
    
    if [ -n "$containers" ]; then
        local count=$(echo $containers | wc -w)
        $output "Deleting $count stopped docker containers"

        docker rm $containers &> /dev/null

        $output "Deleted $count stopped docker containers"
    else
        $output "No stopped docker containers found"
    fi
}

function delete_untagged_images() {
    local images=$(docker images -q -f dangling=true)
    
    if [ -n "$images" ]; then
        local count=$(echo $images | wc -w)
        $output "Deleting $count untagged docker images"

        docker rmi $images &> /dev/null

        $output "Deleted $count untagged docker images"
    else
        $output "No untagged docker images found"
    fi
}

function delete_long_running_containers() {
    local containers=$(docker ps | grep -E 'Up (([3-9] hours)|([1-9][0-9]* (hours|days|weeks)))' | awk '{print $1}')

    if [ -n "$containers" ]; then
        local count=$(echo $containers | wc -w)
        $output "Deleting $count long-running docker containers"

        docker rm -f $containers &> /dev/null

    else
        $output "No long-running docker containers found"
    fi
}

for arg in "$@"; do
    case $arg in
        --stopped)
        delete_stopped_containers
        ;;

        --long-running)
        delete_long_running_containers
        ;;

        --untagged)
        delete_untagged_images
        ;;
    esac
done