需要两个不同的namespace之间的不同pod可以通过name的形式访问

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
  namespace: cjy-test
spec:
  replicas: 1
  selector: #标签选择器
    matchLabels: #匹配的标签为
      app: myapp
      release: canary
  template:
    metadata:
      labels:
        app: myapp #和上面的myapp要匹配
        release: canary
    spec:
      containers:
      - name: myapp
        image: ikubernetes/myapp:v1
        ports:
        - name: http
          containerPort: 80

apiVersion: v1
kind: Service
metadata:
  name: myapp-svc
  namespace: cjy-test
spec:
  selector:
    app: myapp #挑选的pod还是myapp。一个pod可以有多个service
    release: canary
  clusterIP: None #None表示是无头service
  ports:
  - port: 39320 #service ip中的端口
    targetPort: 80 #容器ip中的端口

kind: Service
apiVersion: v1
metadata:
  name: myapp-svcname
  namespace: cjy-test
spec:
  type: ExternalName
  externalName: myapp-svc.cjy2-test.svc.cluster.local

在另一个名称空间的创建方式同上三步