Recently, the managed pod in my mongo deployment onto GKE was automatically deleted and a new one was created in its place. As a result, all my db data was lost.

I specified a PV for the deployment and the PVC was bound too, and I used the standard storage class (google persistent disk). The Persistent Volume Claim had not been deleted either.

Here's an image of the result from kubectl get pv: pvc

My mongo deployment along with the persistent volume claim and service deployment were all created by using kubernets' kompose tool from a docker-compose.yml for a prisma 1 + mongodb deployment.

Here are my yamls:

mongo-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    kompose.cmd: kompose -f docker-compose.yml convert
    kompose.version: 1.21.0 (992df58d8)
  creationTimestamp: null
  labels:
    io.kompose.service: mongo
  name: mongo
  namespace: dbmode
spec:
  replicas: 1
  selector:
    matchLabels:
      io.kompose.service: mongo
  strategy:
    type: Recreate
  template:
    metadata:
      annotations:
        kompose.cmd: kompose -f docker-compose.yml convert
        kompose.version: 1.21.0 (992df58d8)
      creationTimestamp: null
      labels:
        io.kompose.service: mongo
    spec:
      containers:
      - env:
        - name: MONGO_INITDB_ROOT_PASSWORD
          value: prisma
        - name: MONGO_INITDB_ROOT_USERNAME
          value: prisma
        image: mongo:3.6
        imagePullPolicy: ""
        name: mongo
        ports:
        - containerPort: 27017
        resources: {}
        volumeMounts:
        - mountPath: /var/lib/mongo
          name: mongo
      restartPolicy: Always
      serviceAccountName: ""
      volumes:
      - name: mongo
        persistentVolumeClaim:
          claimName: mongo
status: {}

mongo-persistentvolumeclaim.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  creationTimestamp: null
  labels:
    io.kompose.service: mongo
  name: mongo
  namespace: dbmode
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 100Mi
status: {}

mongo-service.yaml

apiVersion: v1
kind: Service
metadata:
  annotations:
    kompose.cmd: kompose -f docker-compose.yml convert
    kompose.version: 1.21.0 (992df58d8)
  creationTimestamp: null
  labels:
    io.kompose.service: mongo
  name: mongo
  namespace: dbmode
spec:
  ports:
  - name: "27017"
    port: 27017
    targetPort: 27017
  selector:
    io.kompose.service: mongo
status:
  loadBalancer: {}

I've tried checking the contents mounted in /var/lib/mongo and all I got was an empty lost+found/ folder, and I've tried to search the Google Persistent Disks but there was nothing in the root directory and I didn't know where else to look.

I guess that for some reason the mongo deployment is not pulling from the persistent volume for the old data when it starts a new pod, which is extremely perplexing.

I also have another kubernetes project where the same thing happened, except that the old pod still showed but had an evicted status.