A tool to clean up untagged GitLab registry images.
GitLab-Registry-Cleanup is a Python package for finding and (soft) deleting untagged Docker images in a GitLab Docker registry. Currently (April 2018), Docker registries only cleanup data if the removal on an image is requested explicitly by the user. Therefore, the registry will keep on growing if users only push new images. Overwriting existing tags is not sufficient since images could be referenced by their SHA256 hash by an external resource. This tool assumes that untagged images are not needed any more and deletes them explicitly. It can only be used for the embedded registry of a GitLab server.
The latest version is available from PyPI and needs Python 3.3+:
python3 -m pip install gitlab-registry-cleanup
This package can only be used on a GitLab server, since it needs read access to the Docker registry files stored on disk. The script needs root privileges, so either use the root account or the sudo utility. The actual deletion of images is done via the GitLab web api to prevent any data loss.
If you use the recommended operating system for GitLab (Ubuntu Server), you can install Python 3 and pip with
apt install python3-pip
if not already installed.
Command Line Interface
After installing with pip, a gitlab-registry-cleanup command is available:
usage: gitlab-registry-cleanup [-h] [-g GITLAB_SERVER] [-r REGISTRY_SERVER] [-c CREDENTIALS_FILE] [-u USERNAME] [-n] [-V] gitlab-registry-cleanup is a utility for cleaning up a GitLab registry by soft deleting untagged images. optional arguments: -h, --help show this help message and exit -g GITLAB_SERVER, --gitlab-server GITLAB_SERVER GitLab server hostname (for example `mygitlab.com`) -r REGISTRY_SERVER, --registry-server REGISTRY_SERVER GitLab registry server hostname (for example `registry.mygitlab.com`) -c CREDENTIALS_FILE, --credentials-file CREDENTIALS_FILE path to a file containing username and password/access token (on two separate lines) -u USERNAME, --user USERNAME user account for querying the GitLab API (default: root) -n, --dry-run only print which images would be deleted -V, --version print the version number and exit
You should specify a GitLab server hostname (-g), a GitLab registry server hostname (-r) and either a credentials file (-c) or username (-u) and password (read from stdin).
Final disk cleanup
gitlab-registry-cleanup only soft deletes images. As a result, images are removed but their data (the image layers) are still stored on disk. To delete unused image layers, you must run the Docker registry garbage collector. If you have installed the GitLab omnibus package, you can run the following commands:
sudo gitlab-ctl stop registry sudo /opt/gitlab/embedded/bin/registry garbage-collect /var/opt/gitlab/registry/config.yml sudo gitlab-ctl start registry
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