• 【k8s】livenessProbe-failureThreshold


    环境

    1. kubernetes 1.20.4
    2. Spring Boot 2.5.0-M3

    目标

    failureThreshold 表示探针的最大失败次数,如果达到了最大的失败次数,
    在存活性探针的情况,容器将重新启动。

    示例

    Pod.yaml

    apiVersion: v1
    kind: Pod
    metadata:
      name: spring-k8s
    spec:
      containers:
        - name: spring-k8s
          image: jiangbo920827/spring-k8s:liveness
          livenessProbe:
            httpGet:
              path: /actuator/health/liveness
              port: http
          ports:
            - name: http
              containerPort: 8080
    

    查看存活探针日志

    2021-03-26 16:06:42 - GET "/actuator/health/liveness", parameters={}
    2021-03-26 16:06:42 - Mapped to Actuator web endpoint 'health-path'
    2021-03-26 16:06:42 - Using 'application/vnd.spring-boot.actuator.v3+json', given [*/*] and supported [application/vnd.spring-boot.actuator.v3+json, application/vnd.spring-boot.actuator.v2+json, application/json]
    2021-03-26 16:06:42 - Writing [org.springframework.boot.actuate.health.CompositeHealth@731b43a6]
    2021-03-26 16:06:42 - Completed 200 OK
    

    查看存活探针

    [root@master ~]# curl 10.244.1.179:8080/actuator/health/liveness|jq
      % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                     Dload  Upload   Total   Spent    Left  Speed
    100    15    0    15    0     0   1590      0 --:--:-- --:--:-- --:--:--  1666
    {
      "status": "UP"
    }
    

    停止探针

    [root@master ~]# curl 10.244.1.179:8080/liveness?name=BROKEN
    BROKEN[root@master ~]#
    

    查看重启事件

    Events:
      Type     Reason     Age                 From               Message
      ----     ------     ----                ----               -------
      Normal   Scheduled  118s                default-scheduler  Successfully assigned default/spring-k8s to node1
      Normal   Pulled     17s (x2 over 117s)  kubelet            Container image "jiangbo920827/spring-k8s:liveness" already present on machine
      Normal   Created    17s (x2 over 117s)  kubelet            Created container spring-k8s
      Normal   Started    17s (x2 over 117s)  kubelet            Started container spring-k8s
      Warning  Unhealthy  17s (x3 over 37s)   kubelet            Liveness probe failed: HTTP probe failed with statuscode: 503
      Normal   Killing    17s                 kubelet            Container spring-k8s failed liveness probe, will be restarted
    

    可以看到重启了,并且有三次存活探针的失败事件。

    总结

    通过定义 failureThreshold 来设定失败的最大次数,默认为 3 次。

    附录

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  • 原文地址:https://www.cnblogs.com/jiangbo44/p/14584716.html
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