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Cleanup Old Docker Images from Nexus Repository

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Cleanup Old Docker Images from Nexus Repository

To keep Docker image management easy, someone built a Nexus CLI to clean up old Docker Images. See how to use it and consider helping out with the project on GitHub.

· Cloud Zone ·
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Learn how integrating security into DevOps to deliver "DevSecOps" requires changing mindsets, processes and technology.

Many of us are using Nexus as a repository to publish Docker images. Typically, we build images tagged with the commit hash (or using semver ideally) after SCM changes automatically in CI, and we push them to the registry. As a result, there are many "unneeded" and "old" images that, in our case, take up a significant amount of disk space.

I looked around the graphical interface of Nexus, and there's apparently nothing to remove several Docker images at the same time. Or even, a scheduled task to clean up old hosted Docker images — and to also clean up layers that are no longer used by any hosted images.

So I have come up with a simple bash script that uses the Docker Registry API to purge Docker images and keep the last X images and delete all others. But is there a better solution? YES! I built a Nexus CLI.

To install Nexus CLI, find the appropriate package for your system and download it. For Linux:

wget https://s3.eu-west-2.amazonaws.com/nexus-cli/1.0.0-beta/linux/nexus-cli


After downloading Nexus CLI. Add the execution permission to the binary:

chmod +x nexus-cli

Note: For Windows, make sure that the nexus-cli binary is available on the PATHThis page contains instructions for setting the PATH on Windows.

After installing, verify that the installation worked by opening a new terminal session and checking if nexus-cli is available:


Once done, configure the Nexus credentials:

nexus-cli configure

Docker Cleanup in Nexus Repository

Through nexus-cli configure, the Nexus CLI will prompt you for four pieces of information. The Username and Password are your account credentials. You will also need your Nexus Hostname and Docker repository name.

That should be it. Try out the following command from your cmd prompt and, if you have any images, you should see them listed:

Docker Cleanup in Nexus Repository

Display image tags:

nexus-cli image tags -name IMAGE_NAME


Docker Cleanup in Nexus Repository

nexus-cli image info -name IMAGE_NAME -tag TAG

Docker Cleanup in Nexus Repository

To remove a specific image:

nexus-cli image delete -name IMAGE_NAME -tag TAG

Docker Cleanup in Nexus Repository

To keep only the last X images and delete all other:

nexus-cli image delete -name IMAGE_NAME -keep X

Docker Cleanup in Nexus Repository

 That’s it! Let’s go back to Nexus Dashboard:

Docker Cleanup in Nexus Repository

As you can see, Nexus kept only the last four images and deleted the others.

Docker Cleanup in Nexus Repository

The CLI is still in its early stages, so you are welcome to contribute to the project on GitHub.

This article was originally published on labouardy.com

Learn how enterprises are using tools to automate security in their DevOps toolchain with these DevSecOps Reference Architectures.

Topics:
cloud ,docker images ,nexus ,cli ,tutorial

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