Introduction/Overview

This lesson takes a deeper dive into Docker commands, especially docker image and docker container.

The docker command

In this 3-minute video, Tom Hicks describes the docker command: docker, docker help, docker pull, and docker run.

Demonstration: Pull and Run a Docker container

In this 8-minute video, Tom demonstrates pulling a Docker image and running the corresponding Docker container.

The docker image subcommand

In this 9-minute video, Tom describes the docker image subcommand and Docker image identifiers (e.g., IMAGE ID):

• docker image show the docker image command options
• docker image ls list the docker images in your local repository:

Sometimes Docker will complain about dependencies, but allow you to remove the Docker image IF you add -f (force) to your command.
Error response from daemon: conflict: unable to delete c15f15ccf180 (must be forced) - image is referenced in multiple repositories

The docker container subcommand

In this 6-minute video, Tom describes the docker container subcommand and the Docker container identifiers (e.g., CONTAINER ID or NAME):

• docker container show the docker container command options
• docker container ls -a list the docker containers currently running (such as any you failed to clean up)

docker container rm f9762fae8eca removes the container using its CONTAINER ID.

• You can also remove the container using its name:
  docker container rm focused_chandrasekhar
• If you don't like the automatically assigned container names, you can even assign a name to a docker container when you run it:
  docker run --name cow -it godlovedc/lolcow
• You can list multiple container identifiers to remove multiple images:
  docker container rm f3b0b1bb8eed f9762fae8eca cow
• Just like cleaning up Docker images, cleaning up Docker containers frees up disk space.

Summary

Docker builds its commands in a hierarchy: docker command subcommand
In this lesson, you explored the subcommands associated with docker image and docker container