Kubernetes 部署文件错误：发现 v1.PodSpec 的字段选择器无效

Question

我在尝试使用 YAML 文件创建部署时收到无效字段选择器错误。错误是error validating data: found invalid field selector for v1.PodSpec，我的文件如下所示。

apiVersion: apps/v1beta1
kind: Deployment
metadata:
 name: zalenium-deployment
spec:
 replicas: 1
 template:
  metadata:
   labels:
    app: zalenium
  spec:
   serviceAccountName: zalenium
   serviceAccount: zalenium
   selector:
    app: zalenium
    role: grid
   containers:
    - name: zalenium-pod
      image: dosel/zalenium
      ports:
      - containerPort: 4444
        protocol: TCP
      volumeMounts:
      - name: zalenium-shared
        mountPath: /tmp/mounted
      - name: zalenium-videos
        mountPath: /home/seluser/videos
      resources:
       requests:
        memory: "250m"
        cpu: "500m"
       limits:
        memory: "1Gi"
   volumes:
   - name: zalenium-shared
     persistentVolumeClaim:
      claimName: zalenium-shared-claim
   - name: zalenium-videos
     persistentVolumeClaim:
      claimName: zalenium-videos-claim

我尝试使用在线 YAML 文件验证器，但它们似乎没有显示格式有任何问题。当我尝试使用 validate=false 标志创建上面的部署时，部署会运行，但随后 pod 会不断崩溃并重新启动 (crashLoopBackOff)。我应该调查什么？我仍然熟悉 k8s，但从错误中我认为它与我部署中的容器规范有关。关于解决这个问题的任何提示？谢谢！

Answer 1

由于错误消息指出选择器是 v1.PodSpec 的 invalid field - 因此该字段在 .spec.template.spec.selector 处无效。我认为您正在寻找的是.spec.selector。

话虽如此，文档指出：

如果指定，.spec.selector 必须匹配 .spec.template.metadata.labels，否则会被 API 拒绝。

因此，您还必须将role: grid 添加到您的元数据标签中（.spec.template.metadata.labels）。你的 .yaml 文件看起来像这样：

apiVersion: apps/v1beta1
kind: Deployment
metadata:
 name: zalenium-deployment
spec:
 selector:
  matchLabels:
   app: zalenium
   role: grid
 replicas: 1
 template:
  metadata:
   labels:
    app: zalenium
    role: grid
  spec:
   serviceAccountName: zalenium
   serviceAccount: zalenium
   containers:
    - name: zalenium-pod
      image: dosel/zalenium
      ports:
      - containerPort: 4444
        protocol: TCP
      volumeMounts:
      - name: zalenium-shared
        mountPath: /tmp/mounted
      - name: zalenium-videos
        mountPath: /home/seluser/videos
      resources:
       requests:
        memory: "250m"
        cpu: "500m"
       limits:
        memory: "1Gi"
   volumes:
   - name: zalenium-shared
     persistentVolumeClaim:
      claimName: zalenium-shared-claim
   - name: zalenium-videos
     persistentVolumeClaim:
      claimName: zalenium-videos-claim