kubernetes - kubectl status.phase=运行返回错误结果

Question

当我运行时:

kubectl get pods --field-selector=status.phase=Running

我懂了:

NAME          READY   STATUS    RESTARTS   AGE
k8s-fbd7b     2/2     Running   0          5m5s
testm-45gfg   1/2     Error     0          22h

我不明白为什么这个命令会给我处于错误状态的 pod？
根据 K8S api ，没有这种东西 STATUS=Error .
如何仅获取处于此错误状态的 Pod？
当我运行时:

kubectl get pods --field-selector=status.phase=Failed

它告诉我没有处于该状态的 Pod。

Answer 1

使用 kubectl get pods --field-selector=status.phase=Failed命令可以显示 Failed 中的所有 Pod阶段。Failed表示 Pod 中的所有容器都已终止，并且至少有一个容器因失败而终止(参见:Pod phase):

Failed - All containers in the Pod have terminated, and at least one container has terminated in failure. That is, the container either exited with non-zero status or was terminated by the system.

在您的示例中，两个 Pod 都在 Running 中阶段，因为至少有一个容器仍在这些 Pod 中运行。:

Running - The Pod has been bound to a node, and all of the containers have been created. At least one container is still running, or is in the process of starting or restarting.

您可以使用以下命令检查 Pod 的当前阶段:

$ kubectl get pod -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.phase}{"\n"}{end}'

让我们检查一下这个命令是如何工作的:

$ kubectl get pods
NAME    READY   STATUS   
app-1   1/2     Error   
app-2   0/1     Error   

$ kubectl get pod -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.phase}{"\n"}{end}'
app-1   Running
app-2   Failed

如您所见，只有 app-2 Pod 在 Failed阶段。 app-1中还有一个容器在运行Pod，所以这个 Pod 在 Running阶段。
列出所有带有 Error 的 Pod状态，您可以简单地使用:

$ kubectl get pods -A | grep Error
default       app-1   1/2     Error     
default       app-2   0/1     Error

此外，值得一提的是，您可以检查 Pod 中所有容器的状态:

$ kubectl get pod -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.containerStatuses[*].state}{"\n"}{end}'
app-1   {"terminated":{"containerID":"containerd://f208e2a1ff08c5ce2acf3a33da05603c1947107e398d2f5fbf6f35d8b273ac71","exitCode":2,"finishedAt":"2021-08-11T14:07:21Z","reason":"Error","startedAt":"2021-08-11T14:07:21Z"}} {"running":{"startedAt":"2021-08-11T14:07:21Z"}}
app-2   {"terminated":{"containerID":"containerd://7a66cbbf73985efaaf348ec2f7a14d8e5bf22f891bd655c4b64692005eb0439b","exitCode":2,"finishedAt":"2021-08-11T14:08:50Z","reason":"Error","startedAt":"2021-08-11T14:08:50Z"}}