Image: Jack Wallen Docker adoption has skyrocketed. In 2015 alone,. That translates to the likelihood of your company employing Docker in the near future significantly higher. Music video 90's. What does that mean to you, as an administrator? Simple.you need to understand the technology. I've covered the installation of Docker as well as the installation of a containerized version of Wordpress. But what about managing your Docker containers and images?
How do you tackle that particular task? One of the more reliable methods is via command line. Thanks to the Docker developers, you have everything you need, to help manage your containers, built in. Let's take a look at some of the tools you have at the ready, to help you manage your Docker containers. Show me your images and containers. A complete listing of all containers on your machine.
Deleting containers and images To remove containers, Docker provides the rm option. This can be a bit tricky. The syntax of the command is: sudo docker rm [OPTIONS] CONTAINER [CONTAINER.] Say you've already listed your containers and you've found the container you want to delete. Would you just issue the command docker rm wordpress and be done with it? That command would return 'No such container.' Instead, you have to delete containers by their Container ID. Glance back at Figure C, where you'll see each container's ID number in the far left column.
Find the ID associated with the container you want to remove and then issue the command: sudo docker rm CONTAINER_ID Where CONTAINER_ID is the actual ID of the container to be removed. If the container is running (you'll get a warning that the container cannot be removed in this case), you must first stop the container. This is done with the command: sudo docker stop CONTAINER_ID Where CONTAINER_ID is the name of the ID for the container. Once you've stopped the container, you can delete it. Docker also has the ability to remove all containers from the machine. Before you do that, you must first stop all containers. The commands to achieve these tasks are: sudo docker stop $(docker ps -a -q) sudo docker rm $(docker ps -a -q) Once you've deleted the containers created from your local images, you can then delete the images themselves.
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This is done with the docker rmi command, like so: sudo docker rmi IMAGE_ID Where IMAGE_ID is the idea of the image. Remember, you get the IMAGE ID from the docker images command. You can also delete all Docker images with the command: sudo docker rmi $(docker images -a -q) Removing dangling volumes A volume is a specially-designated directory, within one or more containers, that bypasses the standard filesystem.