Multiarch Tuning Operator

Description

The Multiarch Tuning Operator enhances the operational experience within multi-architecture clusters, and single-architecture clusters that are migrating to a multi-architecture compute configuration.

This Operator implements the clusterpodplacementconfigs custom resource (CR) to support architecture-aware workload scheduling.

To enable architecture-aware workload scheduling, you must create the ClusterPodPlacementConfig object. When you create the ClusterPodPlacementConfig object, this Operator deploys an operand.

When a pod is created, the operand performs the following actions:

1. Add the multiarch.openshift.io/scheduling-gate scheduling gate that prevents the scheduling of the pod.
2. Compute a scheduling predicate that includes the supported architecture values for the kubernetes.io/arch label.
3. Integrate the scheduling predicate as a nodeAffinity requirement in the pod specification.
4. Remove the scheduling gate from the pod.

When the operand removes the scheduling gate, the pod enters the scheduling cycle. The workload is then scheduled on nodes based on the supported architectures.

The operator can be installed in 4.16+ Openshift Clusters from the Red Hat Operators catalog. For more details, see https://docs.openshift.com/container-platform/4.16/post_installation_configuration/configuring-multi-arch-compute-machines/multiarch-tuning-operator.html.