小编max*_*23_的帖子

我不明白为什么kubernetes需要在只能包含一个pod模板的部署语句中使用pod选择器？随意教育我为什么kubernetes工程师在部署防御中引入选择器语句而不是从模板中自动选择pod？

---
apiVersion: v1
kind: Service
metadata:
  name: grpc-service

spec:
  type: LoadBalancer
  ports:
  - name: grpc
    port: 8080
    targetPort: 8080
    protocol: TCP
  selector:
    app: grpc-test

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: grpc-deployment

spec:
  replicas: 1
  revisionHistoryLimit: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 0

  selector:
    matchLabels:
      app: grpc-test

  template:
    metadata:
      labels:
        app: grpc-test

    spec:
      containers:
      ...

为什么不简单地定义这样的东西？

---
apiVersion: v1
kind: Service
metadata:
  name: grpc-service

spec:
  type: LoadBalancer
  ports:
  - name: grpc
    port: 8080
    targetPort: 8080
    protocol: TCP
  selector:
    app: …