Is there anyway to use github / gitlab for downloading the docker image?

Question

Since Docker Hub only allows 1 private repo, I wonder if there is any way to use Github or Gitlab, etc., to download the images? for instance:

FROM git@github.com/username/repo
...
...
...

Answer 1

Very easy with an account on gitlab.com. GitLab provides a Docker registry linked to projects and you can have unlimited private projects:

• Create a project my-docker-project
• Go to Package and Registries > Container registries, you should see a few commands to access your registry
• Connect your machine to this registry using a command like:

  # Will prompt for login/pass
  docker login registry.gitlab.com
  

  • You'll need an access token or deploy token with read_registry and write_registry scopes. You can generate one via your profile Preferences > Access token. Login is the token name and password the secret token provided.
• You can now push Docker images with commands such as:

  # Push an image 
  docker push registry.gitlab.com/YourUsernameOrGroup/my-docker-project
  
  # Push an image on a sub-path
  docker push registry.gitlab.com/YourUsernameOrGroup/my-docker-project/myimage
  

You can then use the image in a Dockerfile by referencing its URL such as:

FROM registry.gitlab.com/YourUsernameOrGroup/my-docker-project

# ...

Of course the machine from which you build must be authenticated on related GitLab registry using docker login command above (or the project must be public)

Answer 2

both have excellent package registry services

For GitHub GPR For GitLab GCR

Both have excellent features like use it directly from Dockerfile as you want for example.

I have a public example, you can check it in Github with node.js which uses GPR to store the build image/package.