linbit / prestomanifesto

create multi architecture docker registries

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 collects all architecture specific repositories and tags. It then generates the top-level multi-arch image manifests and pushes them. If the image manifests are already up-to-date, no actual change will be made.

Example

$ prestomanifesto registry.io
crane index append --docker-empty-base --manifest registry.io/amd64/rck:latest --manifest registry.io/s390x/rck:latest --tag registry.io/rck:latest

Docker

This requires a bind mount for config.json, containing the credentials for the registry:

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