[zh] Translate migrate-dockershim-dockerd page
Qiming Teng
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title: 将 Docker Engine 节点从 dockershim 迁移到 cri-dockerd
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weight: 9
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content_type: task
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---
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<!--
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title: "Migrate Docker Engine nodes from dockershim to cri-dockerd"
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weight: 9
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content_type: task
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-->
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{{% thirdparty-content %}}
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<!--
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This page shows you how to migrate your Docker Engine nodes to use `cri-dockerd`
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instead of dockershim. You should follow these steps in these scenarios:
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* You want to switch away from dockershim and still use Docker Engine to run
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containers in Kubernetes.
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* You want to upgrade to Kubernetes v{{< skew currentVersion >}} and your
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existing cluster relies on dockershim, in which case you must migrate
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from dockershim and `cri-dockerd` is one of your options.
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To learn more about the removal of dockershim, read the [FAQ page](/dockershim).
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-->
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本页面为你展示如何迁移你的 Docker Engine 节点，使之使用 `cri-dockerd` 而不是 dockershim。
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在以下场景中，你可以遵从这里的步骤执行操作：
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* 你期望不再使用 dockershim，但仍然使用 Docker Engine 来在 Kubernetes 中运行容器。
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* 你希望升级到 Kubernetes v{{< skew currentVersion >}} 且你的现有集群依赖于 dockershim，
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因此你必须放弃 dockershim，而 `cri-dockerd` 是你的一种选项。
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要进一步了解 dockershim 的移除，请阅读 [FAQ 页面](/zh/dockershim)。
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<!--
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## What is cri-dockerd? {#what-is-cri-dockerd}
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In Kubernetes 1.23 and earlier, you could use Docker Engine with Kubernetes,
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relying on a built-in component of Kubernetes named _dockershim_.
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The dockershim component was removed in the Kubernetes 1.24 release; however,
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a third-party replacement, `cri-dockerd`, is available. The `cri-dockerd` adapter
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lets you use Docker Engine through the {{<glossary_tooltip term_id="cri" text="Container Runtime Interface">}}.
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-->
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## cri-dockerd 是什么？ {#what-is-cri-dockerd}
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在 Kubernetes v1.24 及更早版本中，你可以在 Kubernetes 中使用 Docker Engine，
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依赖于一个称作 _dockershim_ 的内置 Kubernetes 组件。
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dockershim 组件在 Kubernetes v1.24 发行版本中已被移除；不过，一种来自第三方的替代品，
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`cri-dockerd` 是可供使用的。`cri-dockerd` 适配器允许你通过
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{{<glossary_tooltip term_id="cri" text="容器运行时接口（Container Runtime Interface，CRI）">}}
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来使用 Docker Engine。
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{{<note>}}
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<!--
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If you already use `cri-dockerd`, you aren't affected by the dockershim removal.
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Before you begin, [Check whether your nodes use the dockershim](/docs/tasks/administer-cluster/migrating-from-dockershim/find-out-runtime-you-use/).
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-->
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如果你已经在使用 `cri-dockerd`，那么你不会被 dockershim 的移除影响到。
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在开始之前，[检查你的节点是否在使用 dockershim](/zh/docs/tasks/administer-cluster/migrating-from-dockershim/find-out-runtime-you-use/)。
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{{</note>}}
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<!--
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If you want to migrate to `cri-dockerd` so that you can continue using Docker
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Engine as your container runtime, you should do the following for each affected
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node:
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1. Install `cri-dockerd`.
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1. Cordon and drain the node.
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1. Configure the kubelet to use `cri-dockerd`.
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1. Restart the kubelet.
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1. Verify that the node is healthy.
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-->
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如果你想要迁移到 `cri-dockerd` 以便继续使用 Docker Engine 作为你的容器运行时，
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你需要在所有被影响的节点上执行以下操作：
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1. 安装 `cri-dockerd`；
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1. 隔离（Cordon）并腾空（Drain）该节点；
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1. 配置 kubelet 使用 `cri-dockerd`；
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1. 重新启动 kubelet；
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1. 验证节点处于健康状态。
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<!--
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Test the migration on non-critical nodes first.
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You should perform the following steps for each node that you want to migrate
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to `cri-dockerd`.
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-->
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首先在非关键节点上测试这一迁移过程。
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你应该针对所有希望迁移到 `cri-dockerd` 的节点执行以下步骤。
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## {{% heading "prerequisites" %}}
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<!--
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* [`cri-dockerd`](https://github.com/mirantis/cri-dockerd#build-and-install)
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installed and started on each node.
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* A [network plugin](/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/).
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-->
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* 安装了 [`cri-dockerd`](https://github.com/mirantis/cri-dockerd#build-and-install)
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并且该服务已经在各节点上启动；
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* 一个[网络插件](/zh/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/)。
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<!--
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## Cordon and drain the node
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1. Cordon the node to stop new Pods scheduling on it:
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```shell
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kubectl cordon <NODE_NAME>
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```
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Replace `<NODE_NAME>` with the name of the node.
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-->
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## 隔离并腾空节点 {#cordon-and-drain-the-node}
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1. 隔离节点，阻止新的 Pod 被调度到节点上：
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```shell
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kubectl cordon <NODE_NAME>
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```
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将 `<NODE_NAME>` 替换为节点名称。
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<!--
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1. Drain the node to safely evict running Pods:
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-->
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2. 腾空节点以安全地逐出所有运行中的 Pod：
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```shell
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kubectl drain <NODE_NAME> --ignore-daemonsets
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```
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<!--
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## Configure the kubelet to use cri-dockerd
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The following steps apply to clusters set up using the kubeadm tool. If you use
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a different tool, you should modify the kubelet using the configuration
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instructions for that tool.
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-->
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## 配置 kubelet 使用 cri-dockerd {#configure-the-kubelet-to-use-cri-dockerd}
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下面的步骤适用于用 kubeadm 工具安装的集群。如果你使用不同的工具，
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你需要使用针对该工具的配置指令来修改 kubelet。
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<!--
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1. Open `/var/lib/kubelet/kubeadm-flags.env` on each affected node.
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1. Modify the `--container-runtime-endpoint` flag to
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`unix:///var/run/cri-dockerd.sock`.
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-->
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1. 在每个被影响的节点上，打开 `/var/lib/kubelet/kubeadm-flags.env` 文件；
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1. 将 `--container-runtime-endpoint` 标志，将其设置为 `unix:///var/run/cri-dockerd.sock`。
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<!--
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The kubeadm tool stores the node's socket as an annotation on the `Node` object
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in the control plane. To modify this socket for each affected node:
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-->
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kubeadm 工具将节点上的套接字存储为控制面上 `Node` 对象的注解。
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要为每个被影响的节点更改此套接字：
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<!--
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1. Edit the YAML representation of the `Node` object:
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```shell
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KUBECONFIG=/path/to/admin.conf kubectl edit no <NODE_NAME>
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```
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Replace the following:
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* `/path/to/admin.conf`: the path to the kubectl configuration file,
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`admin.conf`.
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* `<NODE_NAME>`: the name of the node you want to modify.
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1. Change `kubeadm.alpha.kubernetes.io/cri-socket` from
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`/var/run/dockershim.sock` to `unix:///var/run/cri-dockerd.sock`.
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1. Save the changes. The `Node` object is updated on save.
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-->
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1. 编辑 `Node` 对象的 YAML 表示：
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```shell
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KUBECONFIG=/path/to/admin.conf kubectl edit no <NODE_NAME>
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```
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根据下面的说明执行替换：
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* `/path/to/admin.conf`：指向 kubectl 配置文件 `admin.conf` 的路径；
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* `<NODE_NAME>`：你要修改的节点的名称。
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1. 将 `kubeadm.alpha.kubernetes.io/cri-socket` 标志从
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`/var/run/dockershim.sock` 更改为 `unix:///var/run/cri-dockerd.sock`；
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1. 保存所作更改。保存时，`Node` 对象被更新
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<!--
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## Restart the kubelet
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-->
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## 重启 kubelet {#restart-the-kubelet}
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```shell
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systemctl restart kubelet
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```
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<!--
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## Verify that the node is healthy
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To check whether the node uses the `cri-dockerd` endpoint, follow the
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instructions in [Find out which runtime you use](/docs/tasks/administer-cluster/migrating-from-dockershim/find-out-runtime-you-use/).
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The `--container-runtime-endpoint` flag for the kubelet should be `unix:///var/run/cri-dockerd.sock`.
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-->
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## 验证节点处于健康状态 {#verify-that-the-node-is-healthy}
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要检查节点是否在使用 `cri-dockerd` 端点，
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按照[找出你所使用的运行时](/zh/docs/tasks/administer-cluster/migrating-from-dockershim/find-out-runtime-you-use/)页面所给的指令操作。
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kubelet 的 `--container-runtime-endpoint` 标志取值应该是 `unix:///var/run/cri-dockerd.sock`。
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<!--
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## Uncordon the node
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Uncordon the node to let Pods schedule on it:
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-->
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## 解除节点隔离 {#uncordon-the-node}
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```shell
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kubectl uncordon <NODE_NAME>
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```
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## {{% heading "whatsnext" %}}
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<!--
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* Read the [dockershim removal FAQ](/dockershim/).
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* [Learn how to migrate from Docker Engine with dockershim to containerd](/docs/tasks/administer-cluster/migrating-from-dockershim/change-runtime-containerd/).
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-->
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* 阅读 [dockershim 移除常见问题](/zh/dockershim)。
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* [了解如何从基于 dockershim 的 Docker Engine 迁移到 containerd](/zh/docs/tasks/administer-cluster/migrating-from-dockershim/change-runtime-containerd/)。
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