<p>I have existing applications built with Apache Camel and ActiveMQ. As part of migration to Kubernetes, what we are doing is moving the same services developed with Apache Camel to Kubernetes. I need to deploy ActiveMQ such that I do not lose the data in case one of the Pod dies. </p>

<p>What I am doing now is running a deployment with RelicaSet value to 2. This will start 2 pods and with a Service in front, I can serve any request while atleast 1 Pod is up. However, if one Pod dies, i do not want to lose the data. I want to implement something like a shared file system between the Pods. My environment is in AWS so I can use EBS. Can you suggest, how to achieve that.</p>

<p>Below is my deployment and service YAML.</p>

<pre><code>apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: smp-activemq
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: smp-activemq
    spec:
      containers:
        - name: smp-activemq
          image: dasdebde/activemq:5.15.9
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 61616
          resources:
            limits:
              memory: 512Mi

---
apiVersion: v1
kind: Service
metadata:
  name: smp-activemq
spec:
  type: NodePort
  selector:
    app: smp-activemq
  ports:
    - nodePort: 32191
      port: 61616
      targetPort: 61616
</code></pre>

Debdeep Das
<p><a href="https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/" rel="nofollow noreferrer">StatefulSets</a> are valuable for applications that require stable, persistent storage. Deleting and/or scaling a StatefulSet down will not delete the volumes associated with the StatefulSet. This is done to ensure data safety. The "volumeClaimTemplates" part in yaml will provide stable storage using <a href="https://kubernetes.io/docs/concepts/storage/persistent-volumes/" rel="nofollow noreferrer">PersistentVolumes</a> provisioned by a PersistentVolume Provisioner.</p>

<p>In your case, StatefulSet file definition will look similar to this:</p>

<pre><code>apiVersion: v1
kind: Service
metadata:
  name: smp-activemq
  labels:
    app: smp-activemq
spec:
  type: NodePort
  selector:
    app: smp-activemq
  ports:
  - nodePort: 32191
    port: 61616
    name: smp-activemq
    targetPort: 61616

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: smp-activemq
spec:
  selector:
    matchLabels:
      app: smp-activemq
  serviceName: smp-activemq
  replicas: 1
  template:
    metadata:
      labels:
        app: smp-activemq
    spec:
      containers:
      - name: smp-activemq
        image: dasdebde/activemq:5.15.9
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 61616
          name: smp-activemq
        volumeMounts:
        - name: www
          mountPath: &lt;mount-path&gt;
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "&lt;storageclass-name&gt;"
      resources:
        requests:
          storage: 1Gi
</code></pre>

<p>That what you need to define is your StorageClass name and mountPath. I hope it will helps you.</p>
