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Docker cheatsheet

List the currently running docker containers

docker ps

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List all the docker containers that have run so far

docker ps -a

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Run shell commands in a docker container (aka. interactive terminal)

docker run -it imageName sh

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Run a docker container as a background process

docker run -d imageName

The -d option indicates - detached from the terminal

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Run a docker process in the background and expose the app's ports on random ports while also giving the container a custom name

docker run -d -P --name my-app imageName

The -P option exposes all the container ports on random port numbers. the --name flag sets the name of the running container to the one you specify (my-app in this case)

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List the exposed docker application ports and their corresponding mapped ports on the host system

docker port my-app

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Expose docker container port to a specific system port

docker run -p 8888:80 imageName

Requests arriving on port 8888 on the host system will now be forwarded to port 80 on the container.

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Delete docker containers that have been exited

docker rm $(docker ps -a -q -f status=exited)

Delete a particular docker image

docker images # Shows the list of available images
docker rmi image_id

Remove all unused docker images

docker images -q |xargs docker rmi

Stopping a detached container

docker stop containerId

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