STAN + Block Device

stan-block-device.yaml

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: stan-config
data:
  stan.conf: |
    port: 4222
    http: 8222

    streaming {
     ns: "nats://my-nats:4222"
     id: stan
     store: file
     dir: /mnt/azure/store
     cluster {
       node_id: $POD_NAME
       log_path: /mnt/azure/log
       # Explicit names of resulting peers
       peers: ["stan-0", "stan-1", "stan-2"]
      }
    }
---
apiVersion: v1
kind: Service
metadata:
  name: stan
  labels:
    app: stan
spec:
  selector:
    app: stan
  clusterIP: None
  ports:
  - name: metrics
    port: 7777
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: stan
  labels:
    app: stan
spec:
  selector:
    matchLabels:
      app: stan
  serviceName: stan
  replicas: 3
  volumeClaimTemplates:
  - metadata:
      name: stan-sts-vol
    spec:
      accessModes:
      - ReadWriteOnce
      volumeMode: "Block"
      storageClassName: managed-premium
      resources:
        requests:
          storage: 1Gi
  template:
    metadata:
      labels:
        app: stan
    spec:
      # Prevent NATS Streaming pods running in same host.
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - topologyKey: "kubernetes.io/hostname"
            labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - stan
      # STAN Server
      containers:
      - name: stan
        image: nats-streaming:alpine
        ports:
        - containerPort: 8222
          name: monitor
        - containerPort: 7777
          name: metrics
        args:
         - "-sc"
         - "/etc/stan-config/stan.conf"

        # Required to be able to define an environment variable
        # that refers to other environment variables.  This env var
        # is later used as part of the configuration file.
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
          - name: config-volume
            mountPath: /etc/stan-config
          # - name: stan-sts-vol
          #   mountPath: /data/stan
        volumeDevices:
          - name: stan-sts-vol
            devicePath: /mnt/azure
        # Disable CPU limits.
        resources:
          requests:
            cpu: 0
        livenessProbe:
          httpGet:
            path: /
            port: 8222
          initialDelaySeconds: 10
          timeoutSeconds: 5
      volumes:
      - name: config-volume
        configMap:
          name: stan-config

 kubectl logs stan-0 -c stan
[1] 2020/09/10 17:14:26.499873 [INF] STREAM: Starting nats-streaming-server[stan] version 0.18.0
[1] 2020/09/10 17:14:26.499932 [INF] STREAM: ServerID: vvKc5j3E1kSPljicMumRQY
[1] 2020/09/10 17:14:26.499937 [INF] STREAM: Go version: go1.14.4
[1] 2020/09/10 17:14:26.499941 [INF] STREAM: Git commit: [026e3a6]
[1] 2020/09/10 17:14:26.500011 [INF] STREAM: Shutting down.
[1] 2020/09/10 17:14:26.500021 [FTL] STREAM: Failed to start: unable to create the root directory [/dev/xvda]: mkdir /dev/xvda: not a directory