Feature #21305: implement mirror on sync for docker - Katello - Foreman

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Feature #21305

open

implement mirror on sync for docker

Added by Partha Aji about 7 years ago. Updated over 6 years ago.

Status:

New

Priority:

Normal

Assignee:

Partha Aji

Category:

Container

Target version:

Katello 3.6.1

Difficulty:

Triaged:

Bugzilla link:

1425613

Pull request:

Fixed in Releases:

Found in Releases:

Red Hat JIRA:

Description

When pulp syncs docker repository from upstream it only pulls manifests pointed to by Manifest list or a Tag.
The tag associations are bound to change over time during subsequent syncs. For example tag "latest" may point to a new image manifest. However pulp retains the old tagless manifests and does not delete them.

Docker Manifests/Docker Manifest Lists that do not point to a Tag are very rarely useful from the perspective of the docker client user. Very rarely do users want to say -> docker pull <repo@digest> .

We need to have a "mirror in sync" option in Katello that removes manifests that do not belong to any list or are associated to any tags (similar to the yum one)

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Updated by Partha Aji about 7 years ago

Target version deleted (~~225~~)

Another case pointed to on irc we need to clear tags also

If on sync 1 i have tags A, B, and C, and sync 2 the source repo has tags C, D, E, the repo should only have C, D, E.                               
Right now, the repo would have A B C D E. Use case is that an old tag rhel:7.0 has a bad CVE grade and has been removed from source registry. a sync from that registry should make sure it is gone locally.

Also for capsule sync consider it image "pruning" as well. guaranteeing no old images around is very important

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