Docker tips

Today’s post is a collection of helpful tips to manage Docker.

Kill all running containers

Kills all of the containers currently running on your machine.

$ docker kill $(docker ps -q)

Remove all containers

Remove all containers (running or stopped) from your machine.

$ docker rm $(docker ps -q -a)

Remove dangling images

Any image builds that have failed mid-build will end up in a dangling state. You can remove any of these easily.

$ docker rmi $(docker images -q -f "dangling=true")

Remove all images from your machine

If you need to turn over ALL of the images in your local repository, you can purge out anything with the following.

$ docker rmi $(docker images -q)

Inspect the history of an image

$ docker history --no-trunc image_id

Add changes to existing images

If you’ve got a minor change to make to an already existing image, you can use commit to prevent a full build process.

$  docker commit --change "ENV DEBUG true" image_id

Tune ulimit

Make sure you have enough file descriptors to work with.

$ docker run --ulimit nofile=1024:1024 rest_of_run_arguments