How to remove unused Docker containers and images

remove-docker-containers.md

1. Delete all containers

    $ docker ps -q -a | xargs docker rm
   

-q prints only the container IDs -a prints all containers

Notice that it uses xargs to issue a remove container command for each container ID

2. Delete all untagged images

    $ docker rmi $(docker images | grep “^<none>” | awk ‘{print $3}’)
   

awk must use a single quote (this filters all image IDs)