fails 1.21.5 - "topologySpreadConstraints“失败

Question

暂时试着测试Pod拓扑。我选择使用标准的nginx部署来部署它：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  topologySpreadConstraints:
    - maxSkew: 1
      topologyKey: "topology.kubernetes.io/zone"
      whenUnsatisfiable: ScheduleAnyway
      labelSelector:
        matchLabels:
          app: nginx
    - maxSkew: 1
      topologyKey: "kubernetes.io/hostname"
      whenUnsatisfiable: ScheduleAnyway
      labelSelector:
        matchLabels:
          app: nginx
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

但是，部署失败时会出现以下错误：

➜  Dev kubectl apply -f nginx-test-deployment.yml                                                   
error: error validating "nginx-test-deployment.yml": error validating data: ValidationError(Deployment.spec): unknown field "topologySpreadConstraints" in io.k8s.api.apps.v1.DeploymentSpec; if you choose to ignore these errors, turn validation off with --validate=false

我使用的是EKSv1.21.5，topologySpreadConstraints可以从v1.18中获得。

➜  ~ kubectl version
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.5", GitCommit:"aea7bbadd2fc0cd689de94a54e5b7b758869d691", GitTreeState:"clean", BuildDate:"2021-09-15T21:10:45Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"21+", GitVersion:"v1.21.5-eks-bc4871b", GitCommit:"5236faf39f1b7a7dabea8df12726f25608131aa9", GitTreeState:"clean", BuildDate:"2021-10-29T23:32:16Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"linux/amd64"}

Answer 1

它必须在POD的规范中定义，通过运行kubectl explain Pod.spec.topologySpreadConstraints阅读更多关于这个字段的信息。

因此，将此配置从Deployment.spec.移动到Deployment.spec.template.spec.。

例如：

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:
      topologySpreadConstraints:
        - maxSkew: 1
          topologyKey: "topology.kubernetes.io/zone"
          whenUnsatisfiable: ScheduleAnyway
          labelSelector:
            matchLabels:
              app: nginx
        - maxSkew: 1
          topologyKey: "kubernetes.io/hostname"
          whenUnsatisfiable: ScheduleAnyway
          labelSelector:
            matchLabels:
              app: nginx
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80