Removing containers

When we run the docker container ls -a command, we can see quite a few containers that are in the Exited status. If we don’t need these containers anymore, then it is a good thing to remove them from memory; otherwise, they unnecessarily occupy precious resources. The command to remove a container is as follows:

$ docker container rm <container ID>

Here, <container ID> stands for the ID of the container – a SHA-256 code – that we want to remove. Another way to remove a container is the following:

$ docker container rm <container name>

Here, we use the name of the container.

Challenge

Try to remove one of your exited containers using its ID.

Sometimes, removing a container will not work as it is still running. If we want to force a removal, no matter what the condition of the container currently is, we can use the -f or --force command-line parameter:

$ docker container rm <container ID> --force

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