I am trying to create MongoDB replica-set on kubernetes. I have a namespace 'global' and I have deployed mongodb in that and I have exposed MongoDB pod using a headless service.

Deployment file looks like-

apiVersion: v1
kind: Service
metadata:
  name: mongodb
  namespace: global
spec:
  selector:
    app: mongodb
  ports:
  - port: 27017
  clusterIp: None

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongodb
  namespace: global
spec:
  selector:
    matchLabels:
      app: mongodb
  template:
    metadata:
      labels:
        app: mongodb
    spec:
      containers:
      - name: mongodb
        image: mongo:4.2.1
        args: ["mongod","--replSet", "rs0","--bind_ip","mongodb.global.svc.cluster.local:27017, localhost"]
        resources:
          limits:
            memory: "128Mi"
            cpu: "500m"
        ports:
        - containerPort: 27017

Now if you look at the args I have bind mongodb.global.svc.cluster.local:27017 and localhost to mongo pod, which basically are the interfaces on which mongo would listen. Here I am supposing that -- mongodb.global.svc.cluster.local:27017 this address would resolve to pod IP because [service_name].[namespace].svc.cluster.local is supposed to resolve to pod IP according to kubernetes documentation (in case of headless service which is the case here).

To initiate the replica (According to the documentation), I must exec into the pod and run the following through mongo shell

rs.initiate(
   {
      _id: "rs0",
      version: 1,
      members: [
         { _id: 0, host : "mongodb.global.svc.cluster.local:27017" },
      ]
   }
)

But this throws the following error

{
        "operationTime" : Timestamp(0, 0),
        "ok" : 0,
        "errmsg" : "No host described in new configuration 1 for replica set rs0 maps to this node",
        "code" : 93,
        "codeName" : "InvalidReplicaSetConfig",
        "$clusterTime" : {
                "clusterTime" : Timestamp(0, 0),
                "signature" : {
                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                        "keyId" : NumberLong(0)
                }
        }
}

I don't know what am I doing wrong, the host is supposed to be easily discovered but it's not happening.