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Add documentation for cleaning images

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phil 2024-11-02 19:52:53 +01:00
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README.md
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@ -38,3 +38,31 @@ podman push <image name> docker://<host name>:5000/<image name>
```
To use it in Kubernetes, see <https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/>
## Maintenance
### Remove images / tags
In short:
* login to the registry container
* delete the directories keeping the metadata of the images and tags
* run command *registry garbage_collect* to delete the unreferenced blobs
In practice:
```bash
## Login to the machine with the dedicated user
ssh registry@tiptop
## Run a shell in a registry container
# podman run -it --rm myregistry sh # if the registry is not started
podman exec -it mycontainer sh
# List all images and their tags
ls -lsd /var/lib/registry/docker/registry/v2/repositories/*/_manifests/tags/*
## To remove an image with all its tags:
rm -rf /var/lib/registry/docker/registry/v2/repositories/image_to_be_deleted
## To remove only a tag, eg "latest":
rm -rf /var/lib/registry/docker/registry/v2/repositories/image_to_be_deleted/_manifests/tags/latest
## Clean up the unreferenced blobs
registry garbage-collect -m /etc/docker/registry/config.yml
```