If you need to set up a private registry with a registry mirror, see this page for details on using that flag.
Container registries are collections of container repositories, and can also offer API paths and access rules.
Container repositories are a collection of related container images. The container image has everything a piece of software may need to run, including code, resources, and tools. Container repositories store container images for setup and deployment, and you use the repositories to manage, pull, and push images during cluster operations.
DKP supports operation with several local registry tools.