Merge pull request kubernetes#43086 from liggitt/examples-permissions

Automatic merge from submit-queue (batch tested with PRs 43122, 43086)

Configure example pod namespaces

Fixes kubernetes#43015 
Fixes kubernetes#43019
Fixes kubernetes#38222

Author: Kubernetes Submit Queue

examples/storage/cassandra/cassandra-statefulset.yaml

@@ -57,6 +57,10 @@ spec:
             valueFrom:
               fieldRef:
                 fieldPath: status.podIP
+          - name: POD_NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
         readinessProbe:
           exec:
             command:

examples/storage/hazelcast/hazelcast-deployment.yaml

@@ -17,6 +17,10 @@ spec:
         env:
         - name: "DNS_DOMAIN"
           value: "cluster.local"
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
         ports: 
         - name: hazelcast
           containerPort: 5701