How can you update a running container in Docker?

The correct approach to update a running container in Docker is by using 'docker update' or by redeploying with an updated Docker image. The 'docker update' command allows you to modify specific resource limits or restart policies of a running container without needing to stop it first. This functionality is quite helpful for making adjustments to the container's settings on the fly.

Additionally, if you want to implement significant changes, deploying a new version of an application typically involves creating an updated Docker image. You can build this new image (often with updates in the code or configuration) and then redeploy it. This method involves stopping the current container and starting a new one with the updated image, which is a standard practice when updating applications.

The other approaches include stopping and removing the container, running a non-existent 'docker edit' command, and modifying the Dockerfile. Stopping and removing a container does not actually update it; rather, it removes it from the environment entirely, while the command for editing containers does not exist in Docker. Modifying the Dockerfile would typically require you to build a new image, but it does not affect the running container directly. Thus, the most efficient and effective methods to update a running container remain tied to the use of commands