Again, you could also use some kind of disk space monitoring on the servers, so that you can be alerted, if it goes higher than a certain threshold and then would run these commands. So you could probably wrap these commands in a cron job or execute it as part of build process and let it run on the servers in reference.

Manually, clearing the cache and images every now and then would be tiresome and can be a miss sometimes.

In case any container is using that image, it would show a warning message when you try to remove it. You can clean dangling images by using below command: $ docker rmi $(docker images -f 'dangling=true' -q) You can use below commands to show untagged images: $ docker images –filter 'dangling=true' The ‘repo:tag’ for dangling images would be shown as : or untagged when the command ‘docker images’ is executed. Since the dangling images cause wastage of disk space, they need to be deleted periodically to clear up the disk space for efficient functioning of the server. For instance, an Ubuntu Docker image may have ‘Ubuntu’ as the repository name and ‘latest’ as the tag.Īs the name suggest, a dangling image in Docker is something that is inactive and not being used by any other running images. Now, when you will run docker ps -a, you would no longer see the old containers.Įvery Docker image has a repository name and tag associated with it. To entirely wipe out including running containers, you can use below command: $ docker rm $(docker ps -a -q) So you need to keep a tab on the disk usage.If you are no longer using exited containers, you can use below command to save up disk space: $ docker rm $( docker ps -q -f status=exited) Over the period of time, disk space occupied by these images can become significant. When you first create a container in docker, its associated dockerfile is called and executed to create that container. This creates a new Docker image, which is stored in the folder ‘/var/lib/docker’ by default. During further runs of Dockerfile, Docker will create and commit a new layer to the already existing image. This enables you to restart your container any time later. However, when you exit the container, this container is not deleted. It is very easy to spin up a new container in Docker based on an image.

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