Use headless service DNS instead of pod IP for advertised listeners t…

…o avoid problems in environments where IPs frequently change (e.g. Kubernetes)

charts/cp-kafka/templates/statefulset.yaml

@@ -96,6 +96,14 @@ spec:
           valueFrom:
             fieldRef:
               fieldPath: status.hostIP
+        - name: POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
         - name: KAFKA_HEAP_OPTS
           value: {{ .Values.heapOptions }}
         - name: KAFKA_ZOOKEEPER_CONNECT
@@ -123,7 +131,7 @@ spec:
         - -exc
         - |
           export KAFKA_BROKER_ID=${HOSTNAME##*-} && \
-          export KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://${POD_IP}:9092{{ include "cp-kafka.configuration.advertised.listeners" . }} && \
+          export KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://${POD_NAME}.{{ template "cp-kafka.fullname" . }}-headless.${POD_NAMESPACE}:9092{{ include "cp-kafka.configuration.advertised.listeners" . }} && \
           exec /etc/confluent/docker/run
         volumeMounts:
         {{- $disksPerBroker := .Values.persistence.disksPerBroker | int }}