Can you explain what a Docker registry is and what it is used for?

Docker registry is a service (storage) where Docker images are stored. It allows developers and automation systems to upload (push) and download (pull) container images.

Main tasks of Docker registry:

• Centralized storage of images.
• Ensuring shared access to images among teams.
• Managing image versions.

An example of a public Docker registry is Docker Hub, but a private registry can also be configured for internal company needs.

Usage:

1. Create an image locally.
2. Upload it to the registry using docker push.
3. Other users or servers can download the image via docker pull and run a container.