I am trying to set up a Mongo DBon a specific node on GKE. I upgraded my current cluster using

 gcloud container node-pools create mongo --cluster drogo --num-nodes 1 --region us-east1

It created a new node-pool in the cluster with the name mongo. I have the following Deployment, Volume and Service file.

Deployment.YAML

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongo
spec:
  selector:
    matchLabels:
      app: mongo
  template:
    metadata:
      labels:
        app: mongo
    spec:
      nodeSelector:
        cloud.google.com/gke-nodepool: mongo
      containers:
        - name: mongo
          image: mongo:3.6.17-xenial
          ports:
            - containerPort: 27017
          volumeMounts:
            - name: storage
              mountPath: /data/db
      volumes:
        - name: storage
          persistentVolumeClaim:
            claimName: mongo-pvc

In the above file, I provided the nodeSelector cloud.google.com/gke-nodepool: mongo (as mentioned here)

Volume.YAML

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mongo-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi

Service.YAML

apiVersion: v1
kind: Service
metadata:
  name: mongo
spec:
  selector:
    app: mongo
  ports:
    - port: 27017
      targetPort: 27017

When I check my pod error it says:

Can’t schedule this Pod because no nodes match the nodeSelector.
Cannot schedule pods: node(s) had volume node affinity conflict.

What am I doing wrong here? Any help would be appreciable.

This is how I set up Kubernetes Label into a node pool

I ran gcloud container node-pools describe node --cluster=drogo --region us-east1 and in the response I can see:

autoscaling: {}
config:
  diskSizeGb: 20
  diskType: pd-standard
  imageType: COS_CONTAINERD
  labels:
    mongo: mongo
  machineType: e2-medium