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Docker Cheatsheet

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General commands

  • List total size used by Docker components (Source) 
    docker system df
  • List detailed size used by Docker components (Source) 
    docker system df -v

Containers

  • List all containers 
    docker ps -a
  • List only running containers 
    docker ps
  • List running containers with custom formatting 
    docker ps --format "table {{.ID}}\t{{.Names}}\t{{.Status}}"
  • Enter the shell of the container $CONTAINERNAME (must be running) 
    docker exec -it $CONTAINERNAME sh
  • Stop all running containers, run something, then start them up again 
    CONTRUN2=$(docker ps -q)
 
docker stop $CONTRUN2
 
...
 
docker start $CONTRUN2

Volumes

  • List all volumes 
    docker volume ls
  • Delete the volume $VOLUMENAME 
    docker volume rm $VOLUMENAME
  • List contents of the volume $VOLUMENAME (works with alpine and ubuntu) 
    docker run --rm -v $VOLUMENAME:/data/ alpine ls -la /data
  • Delete contents of the volume $VOLUMENAME
    (works with alpine and ubuntu) 
    docker run --rm -v $VOLUMENAME:/data/ alpine /bin/sh -c "rm -rf /data/*"
  • List all containers using the volume $VOLUMENAME (Source) 
    docker ps -a --filter volume=$VOLUMENAME
  • List all volumes and by which container those are used (Source) 
    for v in $(docker volume ls --format "{{.Name}}")
do
 containers="$(docker ps -a --filter volume=$v --format '{{.Names}}' | tr '\n' ',')"
 echo "volume $v is used by $containers"
done
  • List all volumes and by which container those are used (Alternative formatting, Source) 
    for volume in $(docker volume ls  --format '{{.Name}}')
do
 echo $volume
 docker ps -a --filter volume="$volume"  --format '{{.Names}}' | sed 's/^/  /'
done

Images

  • List all local Docker images

    docker image ls

  • List all local Docker images (including their RepoDigest)

    docker image ls --digests

  • List image (and RepoDigest) of the local image $IMAGENAME

    docker image inspect --format '{{index .RepoDigests 0}}' $IMAGENAME

  • Download image with specific RepoDigest (NOT ImageID, must not be truncated!)

    docker pull jellyfin/jellyfin@sha256:21e49baac0a05efd4822269e3d8ba2f693e741006a2f81aa397cf5f8445e48a9

  • List dangling images (Source)

    docker images -f "dangling=true"

  • List only ImageID of dangling images (Source)

    docker images -qf "dangling=true"

  • Delete all dangling images (Source)

    docker image prune

  • List all images currently used by containers (running and stopped) (Source)

    docker ps -a --format="{{.Image}}"

  • Get ImageID from $IMAGENAME (Source)

    docker images --format "{{.ID}}" --filter=reference=$IMAGENAME

  • List all local images by name, ImageID and RepoDigest (Source)

    docker images --format="{{.Repository}} {{.ID}} {{.Digest}}"

Combined commands

  • List image (and RepoDigest) of running containers 
    docker ps --format '{{.Image}}' | xargs docker image inspect --format '{{if .RepoDigests}}{{index .RepoDigests 0}}{{end}}'
  • List ImageID and tag of running containers: 
    docker inspect $(docker ps -q) | grep Image
  • Print from which tag the running containers have been pulled 
    docker inspect $(docker ps | awk '{print $2}' | grep -v ID) | jq .[].RepoTags

Other commands

  • Restore docker run command of the container $CONTAINERNAME (with runlike) 
    docker run --rm -v /var/run/docker.sock:/var/run/docker.sock:ro assaflavie/runlike $CONTAINERNAME
  • Restore docker run command by inspecting the container $CONTAINERNAME (with docker inspect, Source) 
    docker inspect --format "$(curl -s https://gist.githubusercontent.com/efrecon/8ce9c75d518b6eb863f667442d7bc679/raw/run.tpl)" $CONTAINERNAME
  • …

Useful tools

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