What is Docker Registry?

Docker Registry or Registry is an open source and highly scalable server-side application that can be used to store and distribute Docker images.

The Registry is a stateless, highly scalable server side application that stores and lets you distribute Docker images. The Registry is open-source, under the permissive Apache license.

In short, a registry is a storage and content delivery system.

Why we use it?

You should use the Registry if you want to:

• Tightly control where your images are being stored
• Fully own your images distribution pipeline
• Integrate image storage and distribution tightly into your in-house development workflow

Hands-on Docker Registry

Start your registry

$ docker run -d -p 5000:5000 --name registry registry:2

Pull (or build) some image from the hub

$ docker pull alpine

Tag the image so that it points to your registry

$ docker image tag alpine localhost:5000/myalpine

Push it

$ docker push localhost:5000/myalpine

Pull it back

$ docker pull localhost:5000/myalpine

Now stop your registry and remove all data

$ docker container stop registry && docker container rm -v registry

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