有沒有辦法用 Kubernetes client-go 優雅地結束一個 pod？

Question

主要問題是，是否有辦法從client-go sdk完成 pod，我不是要刪除 pod，我只想使用 Phase-Status: Completed 完成它。

在代碼中，我正在嘗試更新 pod 階段，但它不起作用，它沒有返回錯誤或恐慌，但 pod 沒有完成。 我的代碼：

func main() {

    // creates the in-cluster config
    config, err := rest.InClusterConfig()
    if err != nil {
        panic(err.Error())
    }
    // creates the clientset
    clientset, err := kubernetes.NewForConfig(config)
    if err != nil {
        panic(err.Error())
    }
    for {

        pods, err := clientset.CoreV1().Pods("ns").List(context.TODO(), metav1.ListOptions{})
        if err != nil {
            panic(err.Error())
        }
        for _, pod := range pods.Items {

            podName:= pod.Name
            if strings.Contains(strings.ToLower(podName), "single-condition") {
            
                fmt.Println("get pods metadatada")
                fmt.Println(pod.Name)
                fmt.Printf("pod.Name %s \n", pod.Name)
                fmt.Printf("Status.Phase %s \n", pod.Status.Phase)
                fmt.Printf("PodIP %s \n", pod.Status.PodIP)

                containers := pod.Status.ContainerStatuses
                if len(containers) > 0 {
                    for _ ,c := range containers {
                        fmt.Printf("c.Name %s \n", c.Name)
                        fmt.Printf("c.State %s \n", c.State)
                        fmt.Printf("c.State.Terminated %s \n", c.State.Terminated)

                        stateTerminated := c.State.Terminated
                        stateRunning := c.State.Running
                        if stateTerminated == nil && stateRunning != nil {
                            fmt.Printf("c.State.Terminated %s \n", c.State.Terminated)
                            fmt.Printf("stateRunning Reason: %s\n", reflect.TypeOf(c.State.Running))

                            getPod, getErr := clientset.CoreV1().Pods("ns").Get(context.TODO(), "single-condition-pipeline-9rqrs-1224102659" , metav1.GetOptions{})
                            if getErr != nil {
                                fmt.Println("error1")
                                panic(fmt.Errorf("Failed to get: %v", getErr))
                            }
                            fmt.Println("update values")
                            fmt.Printf(" getPodName %d \n", getPod.Name)
                            getPod.Status.Phase = "Succeeded"
                            fmt.Println("updated status phase")
                            getContainers := getPod.Status.ContainerStatuses
                            fmt.Printf("len get container %d \n", len(getContainers))
                            _, updateErr := clientset.CoreV1().Pods("argo-workflows").Update(context.TODO(), getPod, metav1.UpdateOptions{})
                            fmt.Println("commit update")
                            if updateErr != nil {
                                fmt.Println("error updated")
                                panic(fmt.Errorf("Failed to update: %v", updateErr))
                            }

                        } else {
                            fmt.Printf("c.State.Terminated %s \n", c.State.Terminated.Reason)
                            //fmt.Println("Not finished ready!!!")
                            //fmt.Printf("c.State.Running %s \n", c.State.Running)
                            //fmt.Printf("c.State.Waiting %s \n", c.State.Waiting)
                        }
                    }
                }
            }
        }
        time.Sleep(10 * time.Second)

    }
}

和一些日志：

single-condition-pipeline-9rqrs-1224102659
pod.Name single-condition-pipeline-9rqrs-1224102659 
Status.Phase Running 
PodIP XXXXXXXXXXXX
c.Name main 
---------------------------------------------------------------------------------------------
c.State {nil &ContainerStateRunning{StartedAt:2021-10-29 04:41:51 +0000 UTC,} nil} 
c.State.Terminated nil 
c.State.Terminated nil 
stateRunning Reason: *v1.ContainerStateRunning
update values
 getPodName %!d(string=single-condition-pipeline-9rqrs-1224102659) 
updated status phase
len get container 2 
commit update
c.Name wait 
c.State {nil &ContainerStateRunning{StartedAt:2021-10-29 04:41:51 +0000 UTC,} nil} 
c.State.Terminated nil 
c.State.Terminated nil 
stateRunning Reason: *v1.ContainerStateRunning
update values
 getPodName %!d(string=single-condition-pipeline-9rqrs-1224102659) 
updated status phase
len get container 2 
---------------------------------------------------------------------------------------------
commit update
---------------------------------------------------------------------------------------------
get pods metadatada
single-condition-pipeline-9rqrs-1224102659
pod.Name single-condition-pipeline-9rqrs-1224102659 
Status.Phase Running 
PodIP XXXXXXXXXX 
c.Name main 
c.State {nil &ContainerStateRunning{StartedAt:2021-10-29 04:41:51 +0000 UTC,} nil} 
c.State.Terminated nil 
c.State.Terminated nil 
stateRunning Reason: *v1.ContainerStateRunning
update values
 getPodName %!d(string=single-condition-pipeline-9rqrs-1224102659) 
updated status phase
len get container 2 
commit update
c.Name wait 
c.State {nil &ContainerStateRunning{StartedAt:2021-10-29 04:41:51 +0000 UTC,} nil} 
c.State.Terminated nil 
c.State.Terminated nil 
stateRunning Reason: *v1.ContainerStateRunning
update values
 getPodName %!d(string=single-condition-pipeline-9rqrs-1224102659) 
updated status phase
len get container 2 
commit update

所以在這里： https : //kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-readiness-status ，它提到了一個補丁，但我不知道如何使用它，所以如果有人可以提供幫助我或者如果有另一種方法來完成它。

Answer 1

您不能在 Pod status字段中設置phase或其他任何內容，它是只讀的。 按照波德生命周期文檔您的吊艙將有一個階段Succeeded后，“在群所有容器中的成功已經終止，並不會重新啟動。” 因此，只有當您可以導致所有 pod 的容器以狀態代碼0退出並且 pod restartPolicy設置為onFailure或Never ，如果設置為Always （默認值），那么容器最終將重新啟動並且您的pod 最終會返回到Running階段。

總之，您無法直接通過 Kube API 執行您嘗試執行的操作。 你必須：

1. 確保您的 pod 具有可以支持Succeeded階段的restartPolicy 。
2. 導致您的應用程序終止，可能是通過向它發送SIGINT或SIGTERM ，或者可能是通過它自己的 API 命令它。