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https://ovirt-jira.atlassian.net/browse/OVIRT-2590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eyal Edri updated OVIRT-2590:
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Issue Type: Improvement (was: By-EMAIL)
> Cache Docker images in the datacenter
> -------------------------------------
>
> Key: OVIRT-2590
> URL: https://ovirt-jira.atlassian.net/browse/OVIRT-2590
> Project: oVirt - virtualization made easy
> Issue Type: Improvement
> Reporter: Roman Mohr
> Assignee: infra
>
> What?
> As a user, I expect that I don't have to care about caching to speed up
> builds for the good of the CI system itself.
> Right now there exists a whitelist for docker images, which will not be
> remove from the build slot after the build. Instead of that I expect a
> clean build environment and that in general all images which I regularly
> use are cached in the cluster via e.g. a pull-through-cache [1].
> Why?
> 1) Caching in a build slot is not very effective. CI runs do really-a-lot
> of almost identical things in a small time-window (e.g. days). If caching
> happens in the build-slot and many slots are present, then the cache
> utilization will be very low.
> 2) Whitelisting docker images extra for a slot where the registry runs in,
> is very error prone and since it is not cached across the cluster it is
> also very intransparent what the clear benefit for the user is. Especially
> when thinking about scaling a CI system, that seems to leak internal
> optimizations to the user. Fast builds are twice as important for the CI
> system than they are for the users (by default faster and lower utilization
> is always better than asking people to optimize on their side).
> [1] https://docs.docker.com/registry/recipes/mirror/
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