获取 ValidationError（Deployment.spec）：在 io.k8s.api.apps.v1.DeploymentSpec 中缺少必填字段“选择器”答案

【问题标题】：Getting ValidationError(Deployment.spec): missing required field "selector" in io.k8s.api.apps.v1.DeploymentSpec获取 ValidationError（Deployment.spec）：在 io.k8s.api.apps.v1.DeploymentSpec 中缺少必填字段“选择器”
【发布时间】：2021-04-25 18:53:06
【问题描述】：

我最初在这里提到了类似的问题：ValidationError: missing required field "selector" in io.k8s.api.v1.DeploymentSpec

我将 apiVersion 即 apiVersion: extensions/v1beta1 更改为 apiVersion: apps/v1，我正在使用 kubeadm 和 3 个运行工作程序的节点。

但是在我的 yaml 中，我确实有匹配的标签选择器

    labels:
      app: rabbitmq
      role: master
      tier: queue

如果我尝试运行以下 yaml 部署：我得到

部署“rabbitmq”无效：

spec.selector：必填值
spec.template.metadata.labels：无效值：map[string]string{"app":"rabbitmq", "role":"master", "tier":"queue"}：selector 没有匹配模板labels

rabbitmq.yaml

---
# EXPORT SERVICE INTERFACE
kind: Service
apiVersion: v1
metadata:
    name: message-queue
    labels:
      app: rabbitmq
      role: master
      tier: queue
spec:
  ports:
  - port: 5672
    targetPort: 5672
  selector:
      app: rabbitmq
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: rabbitmq-pv-claim
  labels:
    app: rabbitmq
    role: master
    tier: queue
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: rabbitmq
spec:
  replicas: 1
  template:
    metadata:
      labels:
         app: rabbitmq
         role: master
         tier: queue
    spec:
      containers:
      - name: rabbitmq
        image: bitnami/rabbitmq:3.7
        envFrom:
        - configMapRef:
            name: bitnami-rabbitmq-config
        ports:
        - name: queue
          containerPort: 5672
        - name: queue-mgmt
          containerPort: 15672
        livenessProbe:
          exec:
            command:
            - rabbitmqctl
            - status
          initialDelaySeconds: 120
          timeoutSeconds: 5
          failureThreshold: 6
        readinessProbe:
          exec:
            command:
            - rabbitmqctl
            - status
          initialDelaySeconds: 10
          timeoutSeconds: 3
          periodSeconds: 5
        volumeMounts:
        - name: rabbitmq-storage
          mountPath: /bitnami
      volumes:
      - name: rabbitmq-storage
        persistentVolumeClaim:
          claimName: rabbitmq-pv-claim

【问题讨论】：

标签： kubernetes

【解决方案1】：

您缺少Deployment.spec 下的selector: 字段。目前那里只有replicas: 和template:。

来自Deployment docs的示例：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    ...

另见格式：

kubectl explain Deployment.spec

【讨论】：