yujiangjun / echovista

调查之翼

EchoVista

调查之翼

使用@EnableDiscoveryClient完成读取k8s集群的service列表

1. 首先在集群内创建discoveryServer服务 具体清单文件如下

---
apiVersion: v1
kind: List
items:
  - apiVersion: v1
    kind: Service
    metadata:
      labels:
        app: spring-cloud-kubernetes-discoveryserver
      name: spring-cloud-kubernetes-discoveryserver
    spec:
      ports:
        - name: http
          port: 80
          targetPort: 8761
      selector:
        app: spring-cloud-kubernetes-discoveryserver
      type: ClusterIP
  - apiVersion: v1
    kind: ServiceAccount
    metadata:
      labels:
        app: spring-cloud-kubernetes-discoveryserver
      name: spring-cloud-kubernetes-discoveryserver
  - apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      labels:
        app: spring-cloud-kubernetes-discoveryserver
      name: spring-cloud-kubernetes-discoveryserver:view
    roleRef:
      kind: Role
      apiGroup: rbac.authorization.k8s.io
      name: namespace-reader
    subjects:
      - kind: ServiceAccount
        name: spring-cloud-kubernetes-discoveryserver
  - apiVersion: rbac.authorization.k8s.io/v1
    kind: Role
    metadata:
      namespace: default
      name: namespace-reader
    rules:
      - apiGroups: ["", "extensions", "apps"]
        resources: ["services", "endpoints","deployments","pods"]
        verbs: ["get", "list", "watch"]
  - apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: spring-cloud-kubernetes-discoveryserver-deployment
    spec:
      selector:
        matchLabels:
          app: spring-cloud-kubernetes-discoveryserver
      template:
        metadata:
          labels:
            app: spring-cloud-kubernetes-discoveryserver
        spec:
          serviceAccount: spring-cloud-kubernetes-discoveryserver
          containers:
          - name: spring-cloud-kubernetes-discoveryserver
            image: springcloud/spring-cloud-kubernetes-discoveryserver:3.0.0-SNAPSHOT
            imagePullPolicy: IfNotPresent
            readinessProbe:
              httpGet:
                port: 8761
                path: /actuator/health/readiness
            livenessProbe:
              httpGet:
                port: 8761
                path: /actuator/health/liveness
            ports:
            - containerPort: 8761

2. 开启discover Server 集群外访问
3. 在自己项目里的application.yaml\propertie 文件中开启如下配置

   spring:
   cloud:
     kubernetes:
       discovery:
         enabled: true
         discovery-server-url: http://127.0.0.1:14567/

   4. 在自己的代码中就可以注入自己DiscoveryClient

      @RestController
      @RequestMapping("/")
      @Slf4j
      @AllArgsConstructor
      public class IndexController {
      
      private final DiscoveryClient discoveryClient;
      
      private final MyConfig myConfig;
      
      @GetMapping("/getServices")
      public List<String> getServiceList(){
          String description = discoveryClient.description();
          log.info("description:{}",description);
          return discoveryClient.getServices();
      }
      
      @GetMapping("/getCm")
      public String getCm(){
          log.info("description:{}",myConfig.getMessage());
          return myConfig.getMessage();
      }
      }

4. 请求接口就可以看到了对应的k8s里的接口列表