k8s mongo replica set

1. apply sts
2. rs.initiate()
3. rs.initiate( { ... _id : "rs1", ... members: [ ... { _id: 0, host: "mongo-0.default.svc.cluster.local:27017" }, ... { _id: 1, host: "mongo-w1.default.svc.cluster.local:27017" }, ... { _id: 2, host: "mongo-w2.default.svc.cluster.local:27017" }, ... ] ... })