[zh] sync kubectl-node-debug.md

Author: windsonsea

content/zh-cn/docs/tasks/debug/debug-cluster/kubectl-node-debug.md

@@ -0,0 +1,172 @@
+---
+title: 用 Kubectl 调试 Kubernetes 节点
+content_type: task
+min-kubernetes-server-version: 1.20
+---
+<!--
+title: Debugging Kubernetes Nodes With Kubectl
+content_type: task
+min-kubernetes-server-version: 1.20
+-->
+
+<!-- overview -->
+
+<!--
+This page shows how to debug a [node](/docs/concepts/architecture/nodes/)
+running on the Kubernetes cluster using `kubectl debug` command.
+-->
+本页演示如何使用 `kubectl debug` 命令调试在 Kubernetes
+集群上运行的[节点](/zh-cn/docs/concepts/architecture/nodes/)。
+
+## {{% heading "prerequisites" %}}
+
+{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+
+<!--
+You need to have permission to create Pods and to assign those new Pods to arbitrary nodes.
+You also need to be authorized to create Pods that access filesystems from the host.
+-->
+你需要有权限创建 Pod 并将这些新 Pod 分配到任意节点。
+你还需要被授权创建能够访问主机上文件系统的 Pod。
+
+<!-- steps -->
+
+<!--
+## Debugging a Node using `kubectl debug node`
+
+Use the `kubectl debug node` command to deploy a Pod to a Node that you want to troubleshoot.
+This command is helpful in scenarios where you can't access your Node by using an SSH connection.
+When the Pod is created, the Pod opens an interactive shell on the Node.
+To create an interactive shell on a Node named “mynode”, run:
+-->
+## 使用 `kubectl debug node` 调试节点  {#debugging-a-node-using-kubectl-debug-node}
+
+使用 `kubectl debug node` 命令将 Pod 部署到要排查故障的节点上。
+此命令在你无法使用 SSH 连接节点时比较有用。
+当 Pod 被创建时，Pod 会在节点上打开一个交互的 Shell。
+要在名为 “mynode” 的节点上创建一个交互式 Shell，运行：
+
+```shell
+kubectl debug node/mynode -it --image=ubuntu
+```
+
+```console
+Creating debugging pod node-debugger-mynode-pdx84 with container debugger on node mynode.
+If you don't see a command prompt, try pressing enter.
+root@mynode:/#
+```
+
+<!--
+The debug command helps to gather information and troubleshoot issues. Commands 
+that you might use include `ip`, `ifconfig`, `nc`, `ping`, and `ps` and so on. You can also
+install other tools, such as `mtr`, `tcpdump`, and `curl`, from the respective package manager.
+-->
+调试命令有助于收集信息和排查问题。
+你可能使用的命令包括 `ip`、`ifconfig`、`nc`、`ping` 和 `ps` 等等。
+你还可以从各种包管理器安装 `mtr`、`tcpdump` 和 `curl` 等其他工具。
+
+{{< note >}}
+<!--
+The debug commands may differ based on the image the debugging pod is using and
+these commands might need to be installed.
+-->
+这些调试命令会因调试 Pod 所使用的镜像不同而有些差别，并且这些命令可能需要被安装。
+{{< /note >}}
+
+<!--
+The debugging Pod can access the root filesystem of the Node, mounted at `/host` in the Pod.
+If you run your kubelet in a filesystem namespace,
+the debugging Pod sees the root for that namespace, not for the entire node. For a typical Linux node,
+you can look at the following paths to find relevant logs:
+-->
+用于调试的 Pod 可以访问节点的根文件系统，该文件系统挂载在 Pod 中的 `/host` 路径。
+如果你在 filesystem 名字空间中运行 kubelet，
+则正调试的 Pod 将看到此名字空间的根，而不是整个节点的根。
+对于典型的 Linux 节点，你可以查看以下路径找到一些重要的日志：
+
+<!--
+`/host/var/log/kubelet.log`
+: Logs from the `kubelet`, responsible for running containers on the node.
+
+`/host/var/log/kube-proxy.log`
+: Logs from `kube-proxy`, which is responsible for directing traffic to Service endpoints.
+
+`/host/var/log/containerd.log`
+: Logs from the `containerd` process running on the node.
+
+`/host/var/log/syslog`
+: Shows general messages and information regarding the system.
+
+`/host/var/log/kern.log`
+: Shows kernel logs.
+-->
+`/host/var/log/kubelet.log`
+: 负责在节点上运行容器的 `kubelet` 所产生的日志。
+
+`/host/var/log/kube-proxy.log`
+: 负责将流量导向到 Service 端点的 `kube-proxy` 所产生的日志。
+
+`/host/var/log/containerd.log`
+: 在节点上运行的 `containerd` 进程所产生的日志。
+
+`/host/var/log/syslog`
+: 显示常规消息以及系统相关信息。
+
+`/host/var/log/kern.log`
+: 显示内核日志。
+
+<!--
+When creating a debugging session on a Node, keep in mind that:
+
+* `kubectl debug` automatically generates the name of the new pod, based on
+  the name of the node.
+* The root filesystem of the Node will be mounted at `/host`.
+* Although the container runs in the host IPC, Network, and PID namespaces,
+  the pod isn't privileged. This means that reading some process information might fail
+  because access to that information is restricted to superusers. For example, `chroot /host` will fail.
+  If you need a privileged pod, create it manually.
+-->
+当在节点上创建一个调试会话时，需谨记：
+
+* `kubectl debug` 根据节点的名称自动生成新 Pod 的名称。
+* 节点的根文件系统将被挂载在 `/host`。
+* 尽管容器运行在主机 IPC、Network 和 PID 名字空间中，但 Pod 没有特权。
+  这意味着读取某些进程信息可能会失败，这是因为访问这些信息仅限于超级用户 (superuser)。
+  例如，`chroot /host` 将失败。如果你需要一个有特权的 Pod，请手动创建。
+
+## {{% heading "cleanup" %}}
+
+<!--
+When you finish using the debugging Pod, delete it:
+-->
+当你使用正调试的 Pod 完成时，将其删除：
+
+```shell
+kubectl get pods
+```
+
+```none
+NAME                          READY   STATUS       RESTARTS   AGE
+node-debugger-mynode-pdx84    0/1     Completed    0          8m1s
+```
+
+<!-- Change the pod name accordingly -->
+```shell
+# 相应更改 Pod 名称
+kubectl delete pod node-debugger-mynode-pdx84 --now
+```
+
+```none
+pod "node-debugger-mynode-pdx84" deleted
+```
+
+{{< note >}}
+<!--
+The `kubectl debug node` command won't work if the Node is down (disconnected
+from the network, or kubelet dies and won't restart, etc.).
+Check [debugging a down/unreachable node ](/docs/tasks/debug/debug-cluster/#example-debugging-a-down-unreachable-node)
+in that case.
+-->
+如果节点停机（网络断开或 kubelet 宕机且无法启动等），则 `kubectl debug node` 命令将不起作用。
+这种情况下请检查[调试关闭/无法访问的节点](/zh-cn/docs/tasks/debug/debug-cluster/#example-debugging-a-down-unreachable-node)。
+{{< /note >}}