Container Registry

The Container Registry is implemented using the file system.

• ✅ Implemented of the OCI Distribution Spec
  • Pull
  • Push
  • Content Discovery
  • Content Management
• ✅ Supported Docker Client

Why developed?

I have developed this container registry for learning purposes. And the reason why I implemented this using the file system because I thought it would be easier to understand how images are stored and what kind of files are stored.

⚠ BTW, I do not recommend that you run this application in production.

How to try this on your localhost

Need to fix /etc/hosts like below.

...

# Added by manually
127.0.0.1 container-registry
# End of section

• Build binary - make build
• Run Container Registry - ./bin/registry

If you want to clean up in testdata directry, let's use make clean.

Push

1. Pull any images to push - docker pull registry:2
2. Tag to push - docker tag $(docker images --format '{{.ID}}' --filter=reference='registry') container-registry:5080/registry:latest
3. Try push - docker push container-registry:5080/registry:latest

Pull

Try pull if you have completed push steps

$ docker pull container-registry:5080/registry:latest

debug

docker daemon

MacOS

$ tail -f ~/Library/Containers/com.docker.docker/Data/log/vm/dockerd.log

References

• Container image registry - Build Containers the Hard Way (WIP)
• Open Container Initiative Distribution Specification