相关疑难解决方法(0)

我已经浏览了以下docomentation页面:https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

示例部署yaml如下:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

我们可以在这里看到app: nginx提到标签的三个不同时间.

为什么我们需要每一个？我从官方文档中很难理解它.