Registries

A Docker Registry is basically an image store that offers the following functions:

• Ability to store various images.

• Ability to store various tags for the same image.

• An HTTP API that allows pushing images from a machine that produces them, or pull images to a machine that runs containers from those images.

• TLS-secured connection to the API in order to avoid man-in-the-middle attacks.

There are many registries available. You can use the publicly available Docker Hub or use a private registry of your own. There are many ways to create private registries, and we’ll cover several of them in the Private Registries lesson. In any case, the process to tag and publish your images remains the same for every registry.

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In the next lesson, we will learn how to publish an image.