docker cleanup guide: containers, images, volumes, networks

docker-cleanup-resources.md

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)
$ docker volume ls -qf dangling=true | xargs -r docker volume rm

delete networks

$ docker network ls  
$ docker network ls | grep "bridge"   
$ docker network rm $(docker network ls | grep "bridge" | awk '/ / { print $1 }')

remove docker images

// see: http://stackoverflow.com/questions/32723111/how-to-remove-old-and-unused-docker-images

$ docker images
$ docker rmi $(docker images --filter "dangling=true" -q --no-trunc)

$ docker images | grep "none"
$ docker rmi $(docker images | grep "none" | awk '/ / { print $3 }')

remove docker containers

// see: http://stackoverflow.com/questions/32723111/how-to-remove-old-and-unused-docker-images

$ docker ps
$ docker ps -a
$ docker rm $(docker ps -qa --no-trunc --filter "status=exited")

Resize disk space for docker vm

$ docker-machine create --driver virtualbox --virtualbox-disk-size "40000" default

Docker got cleanup commands built in now:
https://docs.docker.com/engine/reference/commandline/container_prune/
https://docs.docker.com/engine/reference/commandline/image_prune/

I prepared docker image to automate it. The image delete unused images and conatainers only.
https://github.com/SebastianPozoga/docker-cleaner

Docker Hub

resize disk for users that use dinghy

docker-machine rm dinghy                                          //delete the current virtual machine
dinghy create --provider virtualbox --disk=100000  // create the new one

don't you feel Docker has way too many flags and options... wouldn't be easier if all efforts were focused on docker-composer and restrict the yml configuration leaving the freedom for the dockerfiles?
I feel docker is overengineered and misplanned. The learning curve isn't because of the complexity of the system, it's because the bad UX.

docker system prune -fa --volumes will do the trick without prompting for confirmation.
Remove -f if you want to be prompted for confirmation

For docker swarm just create stack:

version: '3.3'
services:
  system-prune:
    image: docker:latest
    command: docker system prune --all --force
    volumes:
     - /var/run/docker.sock:/var/run/docker.sock
    networks:
     - default
    logging:
      driver: json-file
    deploy:
      mode: global
      restart_policy:
        delay: 86400s
networks:
  default:
    driver: overlay

Thanks for this @Monokai, original comment

docker rmi $(docker images --filter "dangling=true" -q --no-trunc)

"docker rmi" requires at least 1 argument."

But I have tons of old images dating back years ago?

EDIT: This worked,

docker images --no-trunc --format '{{.ID}} {{.CreatedSince}}' \
    | grep ' months' | awk '{ print $1 }' \
    | xargs --no-run-if-empty docker rmi

Not sure, if docker-swarm works properly. @reg2005 - it removes it after start, but it doesn't do it periodically. Can you please describe how you restart this service? Do you have cron for recreate service.

I think that

      mode: global
      restart_policy:
        delay: 86400s

doesn't work properly.

//clear all

$docker kill $(docker ps -q) ; docker rm $(docker ps -a -q) ; docker rmi $(docker images -q -a)