✨ Add preparation of clusterclass

[farodin91]

What is the purpose of this pull request/Why do we need it?

Issue #, if available:

Description of changes:

Special notes for your reviewer:

Checklist:

• Documentation updated
• Unit Tests added
• E2E Tests added
• Includes emojis

[lubedacht]

Check out this example from Cluster API

You seem to be missing a couple of things, e.g. clusterclass.spec.workers

Have you been able to create different cluster with different configurations from your ClusterClass template? If yes can you maybe provide some docs on how you did it?

I've checked out your branch, because I have never used ClusterClass before and wanted to test it. I couldn't really figure out how to do it, therefore I dived a bit into the documentation.

https://cluster-api.sigs.k8s.io/tasks/experimental-features/cluster-class/write-clusterclass#clusterclass-with-patches

If I'm not wrong here, you are mixing up multiple things. We need to work with JSON patches.

jsonPatches:
      - op: add
        path: /spec/template....
        valueFrom:
          variable: xxxx

Therefore, you cannot have environment variables in the clusterclass template
(except for maybe CLUSTER_CLASS_NAME and NAMESPACE, used with clusterctl generate yaml)
e.g.

Instead of:

kind: IonosCloudMachineTemplate
apiVersion: infrastructure.cluster.x-k8s.io/v1alpha1
metadata:
  name: "${CLUSTER_CLASS_NAME}-template"
  namespace: '${NAMESPACE}'
spec:
  template:
    spec:
      numCores: ${IONOSCLOUD_MACHINE_NUM_CORES}
      memoryMB: ${IONOSCLOUD_MACHINE_MEMORY_MB}
      disk:
        image:
          id: ${IONOSCLOUD_MACHINE_IMAGE_ID}

You would then need a patch for that. Something like

kind: IonosCloudMachineTemplate
apiVersion: infrastructure.cluster.x-k8s.io/v1alpha1
metadata:
  name: "${CLUSTER_CLASS_NAME}-template"
  namespace: '${NAMESPACE}'
spec:
  template: {}
...
  patches:
  - name: workerMachineType
    definitions:
    - selector:
        apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
        kind: IonosCloudMachineTemplate
        matchResources:
          machineDeploymentClass:
            names:
            - XXXX
      jsonPatches:
      - op: add
        path: /spec/template/spec/numCores
        valueFrom:
          variable: numCPUs
     - op: add
        path: /spec/template/spec/memoryMB
        valueFrom:
          variable: memoryMB
     - op: add
       path: /spec/template/spec/disk/image/id
       valueFrom:
         variable: imageID
...

[65278]

Hi there, nice work.
I haven't tested this, only read it, and all my comments amount to nitpicking, so from my side this is okay, but it's not my place to greenlight this. My only qualification here is also having written a clusterclass.

[farodin91]

I've added a fixed some values and added a bash script for basic testing.

Followup PRs can add:

• end to end testing
• quickstart guide for cluster class

[farodin91]

@lubedacht Everything should be fixed.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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1.5% Duplication on New Code

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