[incubator/cassandra] Cassandra Exporter (#8325)

* Fix Statefulset definition

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

* Cassandra exporter

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

incubator/cassandra/Chart.yaml

@@ -1,5 +1,5 @@
 name: cassandra
-version: 0.6.4
+version: 0.7.0
 appVersion: 3.11.3
 description: Apache Cassandra is a free and open-source distributed database management
   system designed to handle large amounts of data across many commodity servers, providing

incubator/cassandra/README.md

@@ -104,6 +104,7 @@ The following table lists the configurable parameters of the Cassandra chart and
 | `resources`                          | CPU/Memory resource requests/limits             | Memory: `4Gi`, CPU: `2`                                    |
 | `service.type`                       | k8s service type exposing ports, e.g. `NodePort`| `ClusterIP`                                                |
 | `podManagementPolicy`                | podManagementPolicy of the StatefulSet          | `OrderedReady`                                             |
+| `podAnnotations`                     | pod annotations for the StatefulSet             | `{}`                                                       |
 | `updateStrategy.type`                | UpdateStrategy of the StatefulSet               | `OnDelete`                                                 |
 | `livenessProbe.initialDelaySeconds`  | Delay before liveness probe is initiated        | `90`                                                       |
 | `livenessProbe.periodSeconds`        | How often to perform the probe                  | `30`                                                       |
@@ -126,6 +127,11 @@ The following table lists the configurable parameters of the Cassandra chart and
 | `backup.env`                         | Backup environment variables                    | AWS_REGION: `us-east-1`                                    |
 | `backup.resources`                   | Backup CPU/Memory resource requests/limits      | Memory: `1Gi`, CPU: `1`                                    |
 | `backup.destination`                 | Destination to store backup artifacts           | `s3://bucket/cassandra`                                    |
+| `exporter.enabled`                   | Enable Cassandra exporter                       | `false`                                                    |
+| `exporter.image.repo`                | Exporter image repository                       | `criteord/cassandra_exporter`                              |
+| `exporter.image.tag`                 | Exporter image tag                              | `2.0.2`                                                    |
+| `exporter.port`                      | Exporter port                                   | `5556`                                                     |
+| `exporter.jvmOpts`                   | Exporter additional JVM options                 |                                                            |
 
 ## Scale cassandra
 When you want to change the cluster size of your cassandra, you can use the helm upgrade command.

incubator/cassandra/templates/statefulset.yaml

@@ -24,6 +24,10 @@ spec:
         release: {{ .Release.Name }}
 {{- if .Values.podLabels }}
 {{ toYaml .Values.podLabels | indent 8 }}
+{{- end }}
+{{- if .Values.podAnnotations }}
+      annotations:
+{{ toYaml .Values.podAnnotations | indent 8 }}
 {{- end }}
     spec:
 {{- if .Values.selector }}
@@ -39,6 +43,30 @@ spec:
 {{ toYaml .Values.affinity | indent 8 }}
 {{- end }}
       containers:
+{{- if .Values.exporter.enabled }}
+      - name: cassandra-exporter
+        image: "{{ .Values.exporter.image.repo }}:{{ .Values.exporter.image.tag }}"
+        env:
+          - name: CASSANDRA_EXPORTER_CONFIG_listenPort
+            value: {{ .Values.exporter.port | quote }}
+          - name: JVM_OPTS
+            value: {{ .Values.exporter.jvmOpts | quote }}
+        ports:
+          - name: metrics
+            containerPort: {{ .Values.exporter.port }}
+            protocol: TCP
+          - name: jmx
+            containerPort: 5555
+        livenessProbe:
+          tcpSocket:
+            port: {{ .Values.exporter.port }}
+        readinessProbe:
+          httpGet:
+            path: /metrics
+            port: {{ .Values.exporter.port }}
+          initialDelaySeconds: 20
+          timeoutSeconds: 45
+{{- end }}
       - name: {{ template "cassandra.fullname" . }}
         image: "{{ .Values.image.repo }}:{{ .Values.image.tag }}"
         imagePullPolicy: {{ .Values.image.pullPolicy | quote }}

incubator/cassandra/values.yaml

@@ -87,6 +87,10 @@ readinessProbe:
   # nodeSelector:
     # cloud.google.com/gke-nodepool: pool-db
 
+## Additional pod annotations
+## ref: https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/
+podAnnotations: {}
+
 ## Additional pod labels
 ## ref: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
 podLabels: {}
@@ -162,3 +166,13 @@ backup:
   # Additional support can added.
   # Ref: https://github.com/maorfr/skbn
   destination: s3://bucket/cassandra
+
+## Cassandra exported configuration
+## ref: https://github.com/criteo/cassandra_exporter
+exporter:
+  enabled: false
+  image:
+    repo: criteord/cassandra_exporter
+    tag: 2.0.2
+  port: 5556
+  jvmOpts: ""