k8s标签

创建pod时不指定标签，则为空。所以运行 kubectl get pods -L app 将会输出以下内容（其中标签列为空）

删除该pod时，依然会重新建立

建议您显式地定义一个有意义的标签以确保更好的控制 Kubernetes 部署。此外，在创建 Service 时，还需要使用该标签作为 selector，以确保 Service 能够正确地连接到与 Deployment 关联的 Pod。

其实k8s内部已经创建了labels:

kind: Deployment
apiVersion: apps/v1
metadata:
  name: msapp
  namespace: sgai-test
  selfLink: /apis/apps/v1/namespaces/sgai-test/deployments/msapp
  uid: 8890efe0-3d6b-4432-8772-b6cf92fa7a2c
  resourceVersion: '3061013'
  generation: 1
  creationTimestamp: '2023-05-18T05:24:53Z'
  labels:
    run: msapp
  annotations:
    deployment.kubernetes.io/revision: '1'
spec:
  replicas: 1
  selector:
    matchLabels:
      run: msapp
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: msapp
    spec:
      containers:
        - name: msapp
          image: 'master01:5000/sgai-ms-run-app:2.0'
          ports:
            - containerPort: 80
              protocol: TCP
          resources: {}
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          imagePullPolicy: IfNotPresent
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      dnsPolicy: ClusterFirst
      securityContext: {}
      schedulerName: default-scheduler
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 25%
      maxSurge: 25%
  revisionHistoryLimit: 10
  progressDeadlineSeconds: 600
status:
  observedGeneration: 1
  replicas: 1
  updatedReplicas: 1
  readyReplicas: 1
  availableReplicas: 1
  conditions:
    - type: Available
      status: 'True'
      lastUpdateTime: '2023-05-18T05:24:57Z'
      lastTransitionTime: '2023-05-18T05:24:57Z'
      reason: MinimumReplicasAvailable
      message: Deployment has minimum availability.
    - type: Progressing
      status: 'True'
      lastUpdateTime: '2023-05-18T05:24:57Z'
      lastTransitionTime: '2023-05-18T05:24:53Z'
      reason: NewReplicaSetAvailable
      message: ReplicaSet "msapp-69bc4c6846" has successfully progressed.