prestomanifesto

This is an opinionated tool to generate multi-arch docker registries.

Assumptions

• a proper docker registry served via https
• an account that is able to do administrative tasks, that has its credentials in ~/.docker/config.json (i.e., docker login $domain) was successfully executed.
• images are stored in architecture specific namespaces (i.e., $domain/$arch/$image:$tag, where $arch is arbitrary, but usually something like amd64, ppc64le,...)

What does it do?

prestomanifesto (concurrently) crawls a registry and checks if the top-level manifest list (i.e., $domain/$image:$tag) consists of all matching architecture images/tags (i.e., $domain/$arch/$image:$tag for all $arch). It does that for all repositories.

If a top-level manifest needs update, the commands to update are executed or printed on stdout.

prestomanifesto -dry-run $domain

Example

$ prestomanifesto registry.io
docker manifest create --insecure --amend registry.io/rck:latest registry.io/s390x/rck:latest registry.io/amd64/rck:latest
docker manifest push --insecure registry.io/rck:latest

Docker

This requires two bind mounts:

• the docker socket
• a docker.json that contains the credentials for registry

docker run -it --rm \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v ~/.docker/config.json:/etc/docker/config.json linbit/prestomanifesto -dry-run registry.io