# NATS Server Kubernetes Deployment

apiVersion: v1
kind: Namespace
metadata:
  name: event-bus
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nats-config
  namespace: event-bus
data:
  nats.conf: |
    port: 4222
    http_port: 8222
    jetstream:
      store_dir: /data/jetstream
      max_mem: 2GB
      max_file: 10GB
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nats
  namespace: event-bus
spec:
  serviceName: nats
  replicas: 3
  selector:
    matchLabels:
      app: nats
  template:
    metadata:
      labels:
        app: nats
    spec:
      containers:
        - name: nats
          image: nats:2.10-alpine
          args:
            - -c
            - /etc/nats/nats.conf
          ports:
            - name: client
              containerPort: 4222
            - name: cluster
              containerPort: 6222
            - name: monitor
              containerPort: 8222
          volumeMounts:
            - name: config
              mountPath: /etc/nats
            - name: data
              mountPath: /data/jetstream
          resources:
            requests:
              memory: "512Mi"
              cpu: "200m"
            limits:
              memory: "1Gi"
              cpu: "500m"
      volumes:
        - name: config
          configMap:
            name: nats-config
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: standard
        resources:
          requests:
            storage: 10Gi
---
apiVersion: v1
kind: Service
metadata:
  name: nats
  namespace: event-bus
spec:
  clusterIP: None
  ports:
    - port: 4222
      targetPort: 4222
      name: client
    - port: 6222
      targetPort: 6222
      name: cluster
    - port: 8222
      targetPort: 8222
      name: monitor
  selector:
    app: nats