I have a Kubernetes cluster on Google Cloud, I have a database service, which is running in front of a mongodb deployment. I also have a series of microservices, which are attempting to connect to that datastore.

However, they can't seem to find the host.

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

Here's my mongo deployment...

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: mongo-deployment
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: mongo
    spec:
      containers:
      - image: mongo:latest
        name: mongo
        ports:
        - name: mongo
          containerPort: 27017
          hostPort: 27017
        volumeMounts:
          - name: mongo-persistent-storage
            mountPath: /data/db
      volumes:
        - name: mongo-persistent-storage
          gcePersistentDisk:
            pdName: mongo-disk
            fsType: ext4

And an example of one of my services...

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: bandzest-artists
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: bandzest-artists
    spec:
      containers:
      - name: artists-container
        image: gcr.io/<omitted>/artists:41040e8
        ports: 
        - containerPort: 7000
        imagePullPolicy: Always
        env:
        - name: DB_HOST
          value: mongo
        - name: AWS_BUCKET_NAME
          value: <omitted>
        - name: AWS_ACCESS_KEY_ID
          value: <omitted>
        - name: AWS_SECRET_KEY
          value: <omitted>