I am deploying a mongodb statefulset on kubernetes cluster (GKE).

Every time when I first deploy the statefulset I have to run the following command manually on mongo statefulset.

My steps:

1. deploy the yaml file

2. enter to mongo pod by "kubectl exec -it mongo-0 /bin/bash"

3. run "mongo"

4. run

   rs.initiate( { _id : "rs0", members: { _id: 0, host: "mongo-0.mongo:27017" }, { _id: 1, host: "mongo-1.mongo:27017" } })

   to initiate

Can I put this command in mongo-statefulset.yml file or another ways to handle it automatically?

mongo-statefulset.yml:

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mongo
spec:
  selector:
     matchLabels:
       role: mongo
  serviceName: "mongo"
  replicas: 1
  template:
    metadata:
      labels:
        role: mongo
    spec:
      terminationGracePeriodSeconds: 10
      containers:
        - name: mongo
          image: mongo:4.0
          command:
            - mongod
            - "--replSet"
            - rs0
            - "--bind_ip"
            - 0.0.0.0
          ports:
            - containerPort: 27017

Also another critical problem:

Sometime I don't know why all of my pods inside my cluster would suddenly be restarted, everything is normal from being restarted and keep running except this mongo stateful set. The replica set status of mongo became "OTHER" instead of "Primary/Secondary". Therefore, the mongo service cannot be used until I type the following command to recover it:

rsconf = rs.conf()
rsconf.members = [
      { _id: 0, host: "mongo-0.mongo:27017", priority: 1 },
      { _id: 1, host: "mongo-1.mongo:27017", priority: 0.5 }
   ]
rs.reconfig(rsconf, {force: true})

How to recover it automatically?