docker-cleanup

#!/bin/bash

CONTAINER_NAME=${CONTAINER_NAME:=docker-cleanup}
ps="`docker ps -a --format "{{.Names}}: {{.Status}}" | grep ${CONTAINER_NAME}`"

run_container () {
    docker run -d \
        --name docker-cleanup \
        -v /var/run/docker.sock:/var/run/docker.sock:rw \
        -v /var/lib/docker:/var/lib/docker:rw \
        -e "KEEP_IMAGES='docker/compose,nir/composer'" \
        -e "KEEP_CONTAINERS='docker/compose,nir/composer'" \
        -e "DELAY_TIME=86400" \
        -e "CLEAN_PERIOD=86400" \
        meltwater/docker-cleanup:latest
}

remove_container () {
    docker rm -f ${CONTAINER_NAME}
}

error () {
    echo $1
    exit 1
}

case "$1" in
    start)
        if [[ "$ps" == Up* ]]; then
            error "docker-cleanup is already running."
        fi
        
        [ -n "$ps" ] && remove_container >/dev/null
        run_container >/dev/null && echo "Container docker-cleanup started."
    ;;

    stop)
        [ -z "$ps" ] && error "Container docker-cleanup does not exists."

        remove_container >/dev/null && echo "Container docker-cleanup stopped & removed."
    ;;

    *)
        error "$0: start|stop"
    ;;
esac

docker-cleanup.service

[Unit]
Description=Clean unused docker containers/images/volumes
Documentation=https://hub.docker.com/r/meltwater/docker-cleanup/
After=docker.service
Requires=docker.service

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/usr/local/bin/docker-cleanup start
ExecStop=/usr/local/bin/docker-cleanup stop