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docker rm

Definition

The CLI command used to permanently delete one or more containers from the host system, freeing up disk space.

Explain Like I'm New

Throwing the container in the trash. Once you do this, the container and all the un-saved data inside it are gone forever.

Real World Example

You ran a temporary Ubuntu container just to test a bash script. You're done with it. You type `docker rm test-ubuntu` so it doesn't clutter up your hard drive.

Common Use Cases

  • •Cleaning up environments
  • •Resetting state

Crucial Command Flags

Flag / OptionDescription
-f / --forceForce the removal of a running container (uses SIGKILL).
-v / --volumesRemove anonymous volumes associated with the container.

Interview Questions

basic

  • Can you run `docker rm` on a container that is currently running?

intermediate

  • What does the flag `--rm` do when attached to the `docker run` command?

Flash Cards

Question

Run on active container?

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Answer

No. Docker will throw an error protecting the active container. You must `docker stop` it first, or use `docker rm -f` to forcibly kill and delete it simultaneously.

Question

What does --rm do?

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Answer

It tells Docker to act like a self-destructing message. The absolute second the container stops running, Docker automatically deletes the container from the hard drive. Perfect for quick, one-off tasks.