Kubernetes - 为什么选择器字段无法验证部署？

Question

使用Kubernetes 1.2.4,为什么我的下面部署定义(redis.yaml)导致以下错误？

$ kubectl apply -f redis.yaml
error validating "redis.yaml": error validating data: found invalid field name for v1beta1.LabelSelector; if you choose to ignore these errors, turn validation off with --validate=false

redis.yaml:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis
spec:
  replicas: 3
  selector:
    name: redis
  template:
    metadata:
      labels:
        name: redis
    spec:
      containers:
      - name: redis
        image: kubernetes/redis:v1
        ports:
        - containerPort: 6379
        resources:
          limits:
            cpu: "0.1"
        volumeMounts:
        - mountPath: /redis-master-data
          name: data
      volumes:
        - name: data
          emptyDir: {}

Answer 1

在部署选择指令要求你使用的任何一个子场matchLabels或者matchExpressions,所以在我的情况,我需要使用matchLabels:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis
spec:
  replicas: 3
  selector:
    matchLabels:
      name: redis
  template:
    metadata:
      labels:
        name: redis
    spec:
      containers:
      - name: redis
        image: kubernetes/redis:v1
        ports:
        - containerPort: 6379
        resources:
          limits:
            cpu: "0.1"
        volumeMounts:
        - mountPath: /redis-master-data
          name: data
      volumes:
        - name: data
          emptyDir: {}

Answer 2

对象的selector字段v1beta1.DeploymentSpec是类型v1beta1.LabelSelector而不仅仅是普通的映射.因此,您可以在以下matchLabels字段下添加标签selector:

Redis的与 - matchLabels.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis
spec:
  replicas: 3
  selector:
    matchLabels:
      name: redis
  template:
    metadata:
      labels:
        name: redis
    spec:
      containers:
      - name: redis
        image: kubernetes/redis:v1
        ports:
        - containerPort: 6379
        resources:
          limits:
            cpu: "0.1"
        volumeMounts:
        - mountPath: /redis-master-data
          name: data
      volumes:
        - name: data
          emptyDir: {}

或者离开LabelSelector了的DeploymentSpec,在这种情况下,它会匹配来自标签PodSpec:

Redis的-podSpec-labels.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis
  template:
    metadata:
      labels:
        name: redis
    spec:
      containers:
      - name: redis
        image: kubernetes/redis:v1
        ports:
        - containerPort: 6379
        resources:
          limits:
            cpu: "0.1"
        volumeMounts:
        - mountPath: /redis-master-data
          name: data
      volumes:
        - name: data
          emptyDir: {}

请参阅部署文档的" 选择器"部分.