deploy: add pod anti-affinity for provisioner deployments

The added anti-affinity rules prevent provisioner operators from scheduling on
the same nodes. The kubernetes scheduler will spread the pods across nodes to
improve availability during node failures.

Signed-off-by: Nico Berlee <nico.berlee@on2it.net>

deploy/cephfs/kubernetes/csi-cephfsplugin-provisioner.yaml

@@ -29,6 +29,16 @@ spec:
       labels:
         app: csi-cephfsplugin-provisioner
     spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app
+                    operator: In
+                    values:
+                      - csi-cephfsplugin-provisioner
+              topologyKey: "kubernetes.io/hostname"
       serviceAccount: cephfs-csi-provisioner
       containers:
         - name: csi-provisioner

deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml

@@ -29,6 +29,16 @@ spec:
       labels:
         app: csi-rbdplugin-provisioner
     spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app
+                    operator: In
+                    values:
+                      - csi-rbdplugin-provisioner
+              topologyKey: "kubernetes.io/hostname"
       serviceAccount: rbd-csi-provisioner
       containers:
         - name: csi-provisioner