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Chapter 3. About disconnected installation mirroring
As a cluster administrator, you can use a mirror registry to ensure that your clusters only use container images that satisfy your organizational controls on external content.
3.1. Mirror registries for installing clusters in disconnected environments
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You must mirror required container images into a disconnected environment before you can install and provision a cluster there. To mirror those container images, you must have a mirror registry. Consider the following options for creating and using a mirror registry:
- If you already have a container image registry, such as Red Hat Quay, you can use it as your mirror registry. If you do not already have a registry, you must create one.
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After you establish your registry, you need mirroring tools. To mirror your OpenShift Container Platform image repository to the mirror registry in your disconnected environment, you can use the oc-mirror OpenShift CLI (
oc) plugin. The oc-mirror plugin is a single tool that mirrors all required OpenShift Container Platform content and other images to your mirror registry. The oc-mirror plugin is the preferred method for mirroring. -
Alternately, you can use the
oc admcommand to mirror just release and catalog images for OpenShift Container Platform.
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