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cluster-api-cleaner-openstack

A helper operator for CAPO to delete resources created by apps in workload clusters.

OpenstackClusterController

Why?

openstack-cloud-controller-manager in workload cluster creates loadbalancers in OpenStack for services in the cluster. openstack-cinder-csi also creates some volumes in OpenStack for persistentvolumes in the cluster. When the worklaod cluster is deleted, cluster-api-provider-openstack doesn't clean these resources. This controller helps for clean-up of workload clusters.

How does it work?

• It observes OpenStackCluster objects.
• It doesn't do anything in reconcileNormal other than adding finalizer.
• It respects cluster.x-k8s.io/cluster-name label in OpenStackCluster objects to get the actual cluster names.
• clusterTag is built as giant_swarm_cluster_<management-cluster-name>_<workload_cluster-name>.
• When an OpenStackCluster is deleted, it
  • cleans volumes ( whose metadata contains cinder.csi.openstack.org/cluster: <clusterTag> ) created by Cinder CSI
  • cleans loadbalancers ( whose tags contain kube_service_<clusterTag>.* ) created by openstack-cloud-controller-manager