springBootMongo.yml

kind: ConfigMap
apiVersion: v1
metadata:
  name: springappconfigmap
data:
  username: springapp
  password: mongodb@123

---
apiVersion: v1
kind: Secret
metadata:
  name: springappsecrets
type: Opaque
stringData:   # We can define multiple key value pairs.
  password: devdb@123

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-hostpath
spec:
  storageClassName: manual
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  hostPath:
    path: "/tmp/mongodata"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-hostpath
spec:
  storageClassName: manual
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 100Mi

---
## Spring Boot App
apiVersion: apps/v1
kind: Deployment
metadata:
  name: springappdeployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: springapp
  template:
    metadata:
      name: springapppod
      labels:
        app: springapp
    spec:
      containers:
      - name: springappcontainer
        image: dockerhandson/spring-boot-mongo
        ports:
        - containerPort: 8080
        env:
        - name: MONGO_DB_USERNAME
          valueFrom:
            configMapKeyRef:
              name: springappconfigmap
              key: username
        - name: MONGO_DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: springappsecrets
              key: password
        - name: MONGO_DB_HOSTNAME
          value: mongo
---
apiVersion: v1
kind: Service
metadata:
  name: springapp
spec:
  selector:
    app: springapp
  ports:
  - port: 80
    targetPort: 8080
  type: NodePort
---
# Mongo db pod with volumes(HostPath)
apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: mongodbrs
spec:
  selector:
    matchLabels:
      app: mongodb
  template:
     metadata:
       name: mongodbpod
       labels:
         app: mongodb
     spec:
       volumes:
       - name: mongodb-pvc
         persistentVolumeClaim:
           claimName: pvc-hostpath
       containers:
       - name: mongodbcontainer
         image: mongo
         ports:
         - containerPort: 27017
         env:
         - name: MONGO_INITDB_ROOT_USERNAME
           valueFrom:
             configMapKeyRef:
               name: springappconfigmap
               key: username
         - name: MONGO_INITDB_ROOT_PASSWORD
           valueFrom:
             secretKeyRef:
               name: springappsecrets
               key: password
         volumeMounts:
         - name: mongodb-pvc
           mountPath: /data/db
---
apiVersion: v1
kind: Service
metadata:
  name: mongo
spec:
  type: ClusterIP
  selector:
    app: mongodb
  ports:
  - port: 27017
    targetPort: 27017