feat: add CSI controller affinity/anti-affinity rules (#325)

* Add CSI controller affinity/anti-affinity rules

This ensures the replicas are scheduled to run on distinct control plane nodes
on the guest cluster. These rules are the same as those of the cloud provider.

Bump CSI driver chart version

Signed-off-by: Ivan Sim <[email protected]>

Author: ihcsim

charts/harvester-csi-driver/Chart.yaml

@@ -18,7 +18,7 @@ keywords:
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.22
+version: 0.1.23
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to

charts/harvester-csi-driver/templates/deployment.yaml

@@ -88,6 +88,31 @@ spec:
       tolerations:
       {{- toYaml . | nindent 8 }}
       {{- end }}
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+            # For RKE1
+            - matchExpressions:
+              - key: node-role.kubernetes.io/controlplane
+                operator: Exists
+            # For RKE2
+            - matchExpressions:
+              - key: node-role.kubernetes.io/control-plane
+                operator: Exists
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                - key: app.kubernetes.io/name
+                  operator: In
+                  values: [harvester-csi-driver]
+                - key: component
+                  operator: In
+                  values: [csi-controllers]
+              topologyKey: kubernetes.io/hostname
       volumes:
         - hostPath:
             path: {{ .Values.kubeletRootDir }}/harvester-plugins/driver.harvesterhci.io