1.4. OpenShift Virtualization Architecture

The Operator Lifecycle Manager (OLM) deploys operator pods for each component of OpenShift Virtualization:

OLM also deploys the hyperconverged-cluster-operator pod, which is responsible for the deployment, configuration, and life cycle of other components, and several helper pods: hco-webhook, and hyperconverged-cluster-cli-download.

After all operator pods are successfully deployed, you should create the HyperConverged custom resource (CR). The configurations set in the HyperConverged CR serve as the single source of truth and the entrypoint for OpenShift Virtualization, and guide the behavior of the CRs.

The HyperConverged CR creates corresponding CRs for the operators of all other components within its reconciliation loop. Each operator then creates resources such as daemon sets, config maps, and additional components for the OpenShift Virtualization control plane. For example, when the HyperConverged Operator (HCO) creates the KubeVirt CR, the OpenShift Virtualization Operator reconciles it and creates additional resources such as virt-controller, virt-handler, and virt-api.

The OLM deploys the Hostpath Provisioner (HPP) Operator, but it is not functional until you create a hostpath-provisioner CR.

1.4.1. About the HyperConverged Operator (HCO)

링크 복사

The HCO, hco-operator, provides a single entry point for deploying and managing OpenShift Virtualization and several helper operators with opinionated defaults. It also creates custom resources (CRs) for those operators.

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표 1.8. HyperConverged Operator components

Component	Description
deployment/hco-webhook	Validates the HyperConverged custom resource contents.
deployment/hyperconverged-cluster-cli-download	Provides the virtctl tool binaries to the cluster so that you can download them directly from the cluster.
KubeVirt/kubevirt-kubevirt-hyperconverged	Contains all operators, CRs, and objects needed by OpenShift Virtualization.
SSP/ssp-kubevirt-hyperconverged	A Scheduling, Scale, and Performance (SSP) CR. This is automatically created by the HCO.
CDI/cdi-kubevirt-hyperconverged	A Containerized Data Importer (CDI) CR. This is automatically created by the HCO.
NetworkAddonsConfig/cluster	A CR that instructs and is managed by the cluster-network-addons-operator.

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