K8S探针

https://blog.csdn.net/weixin_28820113/article/details/148380309

HTTP探测实战（最常用）

向容器发送 HTTP 请求，若返回状态码为 200-399，则表示检查成功

[root@master ~/probe]# cat readiness.yaml
kind: Pod
apiVersion: v1
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx
    readinessProbe:
      httpGet:
        # http请求的端口
        port: 80
        # http请求的路径
        path: /
        # http请求的主机
        # host: 127.0.0.1
        # 请求方式
        scheme: HTTP
      # 超时时间，指定5秒
      timeoutSeconds: 5
      # 探针检查成功后，需要连续3次检查失败才认为容器出现问题
      failureThreshold: 3
      # 探针检查失败后，需要连续1次检查成功才认为容器恢复正常
      successThreshold: 1
      # 探针检查的执行间隔时间，指定3秒
      periodSeconds: 3
      # 容器启动后等待15秒再开始执行探针检查
      initialDelaySeconds: 15
 
[root@master ~/probe]# kubectl apply -f readiness.yaml
pod/nginx created

 

创建service

[root@master ~/probe]# cat service.yaml
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  type: ClusterIP
  selector:
    # 选择标签为 app: nginx 的 Pod
    app: nginx
  ports:
    - name: http
      protocol: TCP
      # Service的端口
      port: 80
      # Pod 上的端口
      targetPort: 80
[root@master ~/probe]# kubectl apply -f service.yaml
service/nginx-service created

检查Pod、Service、EndPoint资源，发现EndPoint关联的是Pod的IP，符合预期

[root@master ~/probe]# kubectl get po,svc,ep -o wide
NAME        READY   STATUS    RESTARTS   AGE    IP               NODE     NOMINATED NODE   READINESS GATES
pod/nginx   1/1     Running   0          4m2s   100.95.185.232   node02   <none>           <none>
 
NAME                    TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE    SELECTOR
service/nginx-service   ClusterIP   10.96.1.43   <none>        80/TCP    112s   app=nginx
 
NAME                      ENDPOINTS           AGE
endpoints/nginx-service   100.95.185.232:80   112s