第 2 章 Image Registry Operator in OpenShift Container Platform
2.1. Image Registry on cloud platforms and OpenStack
The Image Registry Operator installs a single instance of the OpenShift Container Platform registry, and manages all registry configuration, including setting up registry storage.
Storage is only automatically configured when you install an installer-provisioned infrastructure cluster on AWS, GCP, Azure, or OpenStack.
After the control plane deploys, the Operator will create a default configs.imageregistry.operator.openshift.io resource instance based on configuration detected in the cluster.
If insufficient information is available to define a complete configs.imageregistry.operator.openshift.io resource, the incomplete resource will be defined and the Operator will update the resource status with information about what is missing.
The Image Registry Operator runs in the openshift-image-registry namespace, and manages the registry instance in that location as well. All configuration and workload resources for the registry reside in that namespace.
The Image Registry Operator’s behavior for managing the pruner is orthogonal to the managementState specified on the ClusterOperator object for the Image Registry Operator. If the Image Registry Operator is not in the Managed state, the image pruner can still be configured and managed by the Pruning custom resource.
However, the managementState of the Image Registry Operator alters the behavior of the deployed image pruner job:
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Managed: the--prune-registryflag for the image pruner is set totrue. -
Removed: the--prune-registryflag for the image pruner is set tofalse, meaning it only prunes image metatdata in etcd. -
Unmanaged: the--prune-registryflag for the image pruner is set tofalse.
