Image optimizer using eStargz

[imjasonh]

eStargz is a fully backward-compatible enhancement to container images that allows a correctly-configured containerd installation to lazily pull image bytes on-demand, with possible hints about files to prefetch.

More info:

• https://github.com/containerd/stargz-snapshotter/blob/v0.2.0/docs/stargz-estargz.md
• Add eStargz specification to OCI v1 (support lazy pulling) opencontainers/image-spec#815
• https://github.com/containerd/stargz-snapshotter/blob/v0.2.0/cmd/ctr-remote/commands/optimize.go

kontain.me could provide a pull-through image optimizing registry that fetches the requested image, eStartgz-optimizes it, and serves it, maintaining a mapping between original image digest and optimized alternative.

Something like docker pull estargz.kontain.me/google/cloud-sdk or docker pull estargz.kontain.me/gcr.io/foo/bar

Probably depends on google/go-containerregistry#866

[imjasonh]

estargz.kontain.me