What is Docker Registry and how to deploy your own private image registry in a local network?

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Docker Registry is a system for storing and distributing Docker images. The official and simplest solution for setting up your own storage is the official registry image, which can be run with literally a single command.

A private registry is necessary for companies and developers who want to securely store proprietary code, confidential dependencies, and commercial products without transferring them to the public Docker Hub. This provides complete control over access and network traffic.

To run a basic private registry on a server, the official container is used. By default, it saves data to the local host storage using the volumes mechanism, which guarantees the safety of images when restarting the service itself.

1. Start the registry container with the docker run command, specifying port 5000 and mounting a directory for data.
2. Check functionality by accessing the registry API via a browser or the curl utility at your server's address.
3. Rename the local image according to the rule hostname:port/image_name:tag to push it to your registry.
4. Execute the docker push command to upload the prepared image to the created private storage.

For secure use in production, it is strongly recommended to configure SSL certificates and an authentication system using HTTP-basic auth via an Nginx proxy server placed in front of the registry container. Without encryption, a modern Docker daemon may refuse to transmit the login and password over an insecure HTTP protocol.

What is Docker Registry and how to deploy your own private image registry in a local network?

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