Use Heartbeat extension with HiveMQ Kubernetes Operator

\uD83D\uDCD8 Instructions

Get a local copy of the Helm chart.
This will download the chart of the version $CHART_VERSION and untar it to the subdirectory hivemq-operator:
```
helm pull hivemq/hivemq-operator --version $CHART_VERSION --untar
```
Update dependencies in the chart’s directory.
This command verifies that the required charts, as expressed in 'Chart.yaml', are present in 'charts/' and are at an acceptable version. It will pull down the latest charts that satisfy the dependencies, and clean up old dependencies.
```
helm dependencies update hivemq-operator
```
Edit operator templates, and update the livenessProbe’s declaration.
1. Edit the operator templates:
  1. hivemq-operator/operator-tmpls/cluster-daemon-set.yaml
  2. hivemq-operator/operator-tmpls/cluster-deployment.yaml
  3. hivemq-operator/operator-tmpls/cluster-stateful-set.yaml
2. Find the existing declaration of the livenessProbe:
```
livenessProbe:
  tcpSocket:
    port: {{ util:getPort(spec, "mqtt").port }}
  initialDelaySeconds: 15
  periodSeconds: 30
  failureThreshold: 240
```
3. Replace with the new declaration of the livenessProbe:
```
livenessProbe:
  httpGet:
    path: /heartbeat
    port: {{ util:getPort(spec, "heartbeat").port }}
  initialDelaySeconds: 30
  periodSeconds: 15
  failureThreshold: 240
```

Get the values.yaml file for the hivemq-operator of the version $CHART_VERSION:

helm show values hivemq/hivemq-operator --version $CHART_VERSION > my-values.yaml

Edit the my-values.yaml file:

Add the heartbeat extension to the end of the hivemq.extensions array:

hivemq:
  ...
  extensions:
    ...
    ...    
    - name: hivemq-heartbeat-extension
      extensionUri: https://github.com/hivemq/hivemq-heartbeat-extension/releases/download/1.0.4/hivemq-heartbeat-extension-1.0.4.zip
      enabled: true

Add the heartbeat port to the end of the hivemq.ports array:

hivemq:
  ...
  ports:
    ...
    ...
    - name: "heartbeat"
      port: 9090
      expose: true

Using Helm, install hivemq-operator from the local directory hivemq-operator which is containing updated operator templates, and use the updated my-values.yaml:
```
helm upgrade my-hivemq \ 
  --install hivemq-operator \ 
  --values my-values.yaml 
```
When the hivemq-operator and hivemq pods are ready, monitor the event.log:
```
kubectl exec pod/my-hivemq-abcdefgh -- tail -f log/event.log
```

Use Heartbeat extension with HiveMQ Kubernetes Operator

\uD83D\uDCD8 Instructions

\uD83D\uDCCB Related articles