How to set cluster name in Openstack Cloud Controller Manager?

[kralicky]

I have been running into this issue: kubernetes/cloud-provider-openstack#2241, and this comment on the issue mentions that the cluster name needs to be unique in order for LoadBalancer names to not collide.

I am currently installing the OCCM via ClusterResourceSet, like this:

apiVersion: addons.cluster.x-k8s.io/v1beta1
kind: ClusterResourceSet
metadata:
  name: openstack-ccm
  namespace: capi
spec:
  strategy: Reconcile
  clusterSelector:
    matchLabels:
      ccm: openstack
  resources:
    - name: openstack-ccm-manifests
      kind: ConfigMap

where the configmap contains all of the manifests here.

The default manifests have the "kubernetes" cluster name:

- name: CLUSTER_NAME
  value: kubernetes

How do I pass the actual cluster name to these manifests? There does not appear to be a mechanism like variable substitution or templating available in this context. Or, is there a better way to install the OCCM?

[lentzi90]

I think perhaps this issue belongs to cloud-provider-openstack and not cluster-api-provider-openstack?
Anyway, if you want to set a custom cluster name through CAPI, that could be done using the ClusterConfiguration of the KubeadmControlPlane:
https://pkg.go.dev/sigs.k8s.io/cluster-api@v1.10.1/bootstrap/kubeadm/api/v1beta1#ClusterConfiguration
For OCCM I think you need to patch those manifests. I would do it by creating a kustomization that gathers the manifests you linked to and then provide a patch that changes the cluster name.

[mnaser]

I agree, this is not a CAPO issue. We use the Helm charts that we template out and you can set the cluster name there too.

[kralicky]

Is it not possible then to do this with a single ClusterResourceSet that all clusters can use? I'd prefer not to have to duplicate it for every cluster I want to create, since I wouldn't be able to create and delete clusters just by creating or deleting a single Cluster resource.

[lentzi90]

I don't think it is possible, no. Perhaps it is possible to create a ClusterClass or similar template that automatically creates a ClusterResourceSet per Cluster with the correct name? That could be something to ask the CAPI community about. If it is not possible they may be open to a feature request