A docker registry is the repository where the docker image is published and shared. You may choose from the following registries:
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Docker Hub -- Docker's official registry, it is the default registry when you install Docker. You can connect to the public registry (hub.docker.com:443) that anyone can use or your own private registry. You will be required to log into Docker Hub before you can store the image. For more about Docker Hub, refer to https://docs.docker.com/docker-hub/.
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A self-hosted Docker Registry -- Your own registry created using the open-source Docker Registry. For more about Docker Registry, refer to https://docs.docker.com/registry/.
Step 1: Set up a docker registry.
In this tutorial, a self-hosted Docker Registry has already been set up in a Linux server (suppose its IP address and port number are 172.25.100.20:5000).
Write down this information as it will be required when you build and publish the Web API project as a docker image (in the later section Publishing Web APIs to Docker).
To know more about Docker, we recommend you start by understanding the Docker Architecture.
