You may received an Error response from daemon: You cannot remove a running container [CONTAINER_ID] Stop the container before attempting removal or force remove when you trying to remove the running container in Docker.

$ ​docker container rm 2cf e43 9a5


Error response from daemon: You cannot remove a running container 2cfe439a588bb40ceb91800b8d9a3ba25823b29b3644a52602a40619faca49bb. Stop the container before attempting removal or force remove

Just look at the docker container remove option using the --help option,


$ docker container rm --help

Usage:  docker container rm [OPTIONS] CONTAINER [CONTAINER...]

Remove one or more containers

Options:
  -f, --force     Force the removal of a running container (uses SIGKILL)
  -l, --link      Remove the specified link
  -v, --volumes   Remove anonymous volumes associated with the container


So, using the -f or --force option in rm Force the removal of a running container.

$ ​docker container rm -f  2cfe439a5