Kubernetes环境下Golang与MongoDB连接失败求助

在Kubernetes环境部署Golang HTTP服务与MongoDB后，两者无法建立连接。以下是相关Deployment、Service配置文件、Golang连接MongoDB的代码，以及我试过的连接字符串，恳请协助排查问题。

一、Kubernetes配置文件 #

apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend
  labels:
    app: backend
spec:
  selector:
    matchLabels:
      app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
      - image: royroyee/backend:0.8
        name: backend
        ports:
        - containerPort: 9001

---
apiVersion: v1
kind: Service
metadata:
  name: backend-service
  labels:
    run: backend-service
spec:
  ports:
    - port: 9001
      targetPort: 9001
      protocol: TCP
  selector:
    app: backend
  type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongo
  labels:
    app: mongo
spec:
  selector:
    matchLabels:
      app: mongo
  template:
    metadata:
      labels:
        app: mongo
    spec:
      containers:
      - image: mongo
        name: mongo-db
        ports:
        - containerPort: 27017
---
apiVersion: v1
kind: Service
metadata:
  name: mongo-service
  labels:
    run: mongo-service
spec:
  ports:
    - port: 27017
      targetPort: 27017
      protocol: TCP
  selector:
    app: mongo

二、Golang连接MongoDB代码 #

func getSession() *mgo.Session {
    s, err := mgo.Dial("mongodb://mongo-service:27017/mongo-db")
    // 原代码未展示错误处理逻辑
}

三、已尝试的连接字符串 #

• mongodb://mongo-service:27017/backend
• mongodb://mongo-service:27017/mongo-db
• mongodb://mongo-service:27017

内容的提问来源于stack exchange，提问作者Younghwan Kim