Prerequisites
You must meet several prerequisites before you can mirror images using the oc adm release mirror command.
You must meet the following prerequisites:
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You must have a container image registry that supports Docker v2-2 in the location that will host the Red Hat OpenShift Container Platform cluster, such as one of the following registries:
If you have an entitlement to Red Hat Quay, see the documentation on deploying Red Hat Quay for proof-of-concept purposes or by using the Red Hat Quay Operator. If you need additional assistance selecting and installing a registry, contact your sales representative or Red Hat Support.
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If you do not already have an existing solution for a container image registry, subscribers of Red Hat OpenShift Container Platform are provided a mirror registry for Red Hat OpenShift. The mirror registry for Red Hat OpenShift is included with your subscription and is a small-scale container registry that can be used to mirror the required container images of Red Hat OpenShift Container Platform in disconnected installations.