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Docker and Kubernetes for Java Developers by Jaroslaw Krochmalski

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Docker registry, repository, and index

The first component in Docker's distribution system is the registry. Docker utilizes a hierarchical system for storing images, shown in the following screenshot:

Images which you build can be stored in a remote registry for others to use. The Docker registry is a service (an application, in fact) that is storing your Docker images. The Docker Hub is an example of the publicly available registry; it's free and serves a huge, constantly growing collection of existing images. The repository, on the other hand, is a collection (namespace) of related images, usually providing different versions of the same ...

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