It is not only Docker that offers image registry services; companies such as Red Hat offer their own registry. You can find the Red Hat Container Catalog at https://access.redhat.com/containers/. Here, you will find containerized versions of all of Red Hat's product offerings, along with containers to support its OpenShift (https://www.openshift.com/) offering. Services such as Artifactory by JFrog (https://www.jfrog.com/artifactory/) offer a private Docker registry as part of their build services.

There are also Registry as a Service offerings; we are going to take a look at two of them.