Merge pull request #32205 from tengqm/zh-coredns
[zh] Update coredns page
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@ -28,8 +28,10 @@ This page describes the CoreDNS upgrade process and how to install CoreDNS inste
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<!--
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## About CoreDNS
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[CoreDNS](https://coredns.io) is a flexible, extensible DNS server that can serve as the Kubernetes cluster DNS.
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Like Kubernetes, the CoreDNS project is hosted by the {{< glossary_tooltip text="CNCF" term_id="cncf" >}}.
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[CoreDNS](https://coredns.io) is a flexible, extensible DNS server
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that can serve as the Kubernetes cluster DNS.
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Like Kubernetes, the CoreDNS project is hosted by the
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{{< glossary_tooltip text="CNCF" term_id="cncf" >}}.
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-->
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## 关于 CoreDNS
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@ -37,11 +39,12 @@ Like Kubernetes, the CoreDNS project is hosted by the {{< glossary_tooltip text=
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与 Kubernetes 一样，CoreDNS 项目由 {{< glossary_tooltip text="CNCF" term_id="cncf" >}} 托管。
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<!--
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You can use CoreDNS instead of kube-dns in your cluster by replacing kube-dns in an existing
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deployment, or by using tools like kubeadm that will deploy and upgrade the cluster for you.
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You can use CoreDNS instead of kube-dns in your cluster by replacing
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kube-dns in an existing deployment, or by using tools like kubeadm
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that will deploy and upgrade the cluster for you.
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-->
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通过在现有的集群中替换 kube-dns，可以在集群中使用 CoreDNS 代替 kube-dns 部署，
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或者使用 kubeadm 等工具来为你部署和升级集群。
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通过替换现有集群部署中的 kube-dns，或者使用 kubeadm 等工具来为你部署和升级集群，
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可以在你的集群中使用 CoreDNS 而非 kube-dns，
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<!--
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## Installing CoreDNS
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@ -52,105 +55,93 @@ For manual deployment or replacement of kube-dns, see the documentation at the
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## 安装 CoreDNS
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有关手动部署或替换 kube-dns，请参阅
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[CoreDNS GitHub 工程](https://github.com/coredns/deployment/tree/master/kubernetes)。
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[CoreDNS GitHub 项目](https://github.com/coredns/deployment/tree/master/kubernetes)。
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<!--
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## Migrating to CoreDNS
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### Upgrading an existing cluster with kubeadm
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-->
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## 迁移到 CoreDNS
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### 使用 kubeadm 升级现有集群
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<!--
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In Kubernetes version 1.10 and later, you can also move to CoreDNS when you use `kubeadm` to upgrade
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a cluster that is using `kube-dns`. In this case, `kubeadm` will generate the CoreDNS configuration
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("Corefile") based upon the `kube-dns` ConfigMap, preserving configurations for
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In Kubernetes version 1.21, kubeadm removed its support for `kube-dns` as a DNS application.
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For `kubeadm` v{{< skew currentVersion >}}, the only supported cluster DNS application
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is CoreDNS.
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-->
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在 Kubernetes 1.21 版本中，kubeadm 移除了对将 `kube-dns` 作为 DNS 应用的支持。
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对于 `kubeadm` v{{< skew currentVersion >}}，所支持的唯一的集群 DNS 应用是 CoreDNS。
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<!--
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You can move to CoreDNS when you use `kubeadm` to upgrade a cluster that is
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using `kube-dns`. In this case, `kubeadm` generates the CoreDNS configuration
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("Corefile") based upon the `kube-dns` ConfigMap, preserving configurations for
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stub domains, and upstream name server.
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-->
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在 Kubernetes 1.10 及更高版本中，当你使用 `kubeadm` 升级使用 `kube-dns` 的集群时，你还可以迁移到 CoreDNS。
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在本例中 `kubeadm` 将生成 CoreDNS 配置（"Corefile"）基于 `kube-dns` ConfigMap，
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当你使用 `kubeadm` 升级使用 `kube-dns` 的集群时，你还可以执行到 CoreDNS 的迁移。
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在这种场景中，`kubeadm` 将基于 `kube-dns` ConfigMap 生成 CoreDNS 配置（"Corefile"），
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保存存根域和上游名称服务器的配置。
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<!--
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If you are moving from kube-dns to CoreDNS, make sure to set the `CoreDNS` feature gate to `true`
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during an upgrade. For example, here is what a `v1.11.0` upgrade would look like:
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-->
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如果你正在从 kube-dns 迁移到 CoreDNS，请确保在升级期间将 `CoreDNS` 特性门设置为 `true`。
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例如，`v1.11.0` 升级应该是这样的:
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```
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kubeadm upgrade apply v1.11.0 --feature-gates=CoreDNS=true
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```
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<!--
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In Kubernetes version 1.13 and later the `CoreDNS` feature gate is removed and CoreDNS
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is used by default.
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-->
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在 Kubernetes 版本 1.13 和更高版本中，`CoreDNS`特性门已经删除，CoreDNS 在默认情况下使用。
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<!--
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In versions prior to 1.11 the Corefile will be **overwritten** by the one created during upgrade.
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**You should save your existing ConfigMap if you have customized it.** You may re-apply your
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customizations after the new ConfigMap is up and running.
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-->
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在 1.11 之前的版本中，核心文件将被升级过程中创建的文件覆盖。
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**如果已对其进行自定义，则应保存现有的 ConfigMap。**
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在新的 ConfigMap 启动并运行后，你可以重新应用自定义。
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<!--
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If you are running CoreDNS in Kubernetes version 1.11 and later, during upgrade,
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your existing Corefile will be retained.
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-->
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如果你在 Kubernetes 1.11 及更高版本中运行 CoreDNS，则在升级期间，将保留现有的 Corefile。
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<!--
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In Kubernetes version 1.21, support for `kube-dns` is removed from kubeadm.
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-->
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在 kubernetes 1.21 中，kubeadm 移除了对 `kube-dns` 的支持。
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<!--
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## Upgrading CoreDNS
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CoreDNS is available in Kubernetes since v1.9.
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You can check the version of CoreDNS shipped with Kubernetes and the changes made to CoreDNS [here](https://github.com/coredns/deployment/blob/master/kubernetes/CoreDNS-k8s_version.md).
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You can check the version of CoreDNS that kubeadm installs for each version of
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Kubernetes in the page
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[CoreDNS version in Kubernetes](https://github.com/coredns/deployment/blob/master/kubernetes/CoreDNS-k8s_version.md).
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-->
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## 升级 CoreDNS
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从 v1.9 起，Kubernetes 提供了 CoreDNS。
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你可以在[此处](https://github.com/coredns/deployment/blob/master/kubernetes/CoreDNS-k8s_version.md)
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查看 Kubernetes 随附的 CoreDNS 版本以及对 CoreDNS 所做的更改。
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你可以在 [CoreDNS version in Kubernetes](https://github.com/coredns/deployment/blob/master/kubernetes/CoreDNS-k8s_version.md)
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页面查看 kubeadm 为不同版本 Kubernetes 所安装的 CoreDNS 版本。
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<!--
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CoreDNS can be upgraded manually in case you want to only upgrade CoreDNS or use your own custom image.
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There is a helpful [guideline and walkthrough](https://github.com/coredns/deployment/blob/master/kubernetes/Upgrading_CoreDNS.md) available to ensure a smooth upgrade.
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CoreDNS can be upgraded manually in case you want to only upgrade CoreDNS
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or use your own custom image.
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There is a helpful [guideline and walkthrough](https://github.com/coredns/deployment/blob/master/kubernetes/Upgrading_CoreDNS.md)
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available to ensure a smooth upgrade.
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Make sure the existing CoreDNS configuration ("Corefile") is retained when
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upgrading your cluster.
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-->
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如果你只想升级 CoreDNS 或使用自己的自定义镜像，则可以手动升级 CoreDNS。
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如果你只想升级 CoreDNS 或使用自己的定制镜像，也可以手动升级 CoreDNS。
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参看[指南和演练](https://github.com/coredns/deployment/blob/master/kubernetes/Upgrading_CoreDNS.md)
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文档了解如何平滑升级。
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在升级你的集群过程中，请确保现有 CoreDNS 的配置（"Corefile"）被保留下来。
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<!--
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If you are upgrading your cluster using the `kubeadm` tool, `kubeadm`
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can take care of retaining the existing CoreDNS configuration automatically.
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-->
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如果使用 `kubeadm` 工具来升级集群，则 `kubeadm` 可以自动处理保留现有 CoreDNS
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配置这一事项。
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<!--
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## Tuning CoreDNS
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When resource utilisation is a concern, it may be useful to tune the configuration of CoreDNS. For more details, check out the
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When resource utilisation is a concern, it may be useful to tune
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the configuration of CoreDNS. For more details, check out the
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[documentation on scaling CoreDNS]((https://github.com/coredns/deployment/blob/master/kubernetes/Scaling_CoreDNS.md)).
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-->
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## CoreDNS 调优
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当资源利用方面有问题时，优化 CoreDNS 的配置可能是有用的。
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有关详细信息，请参阅[有关扩缩 CoreDNS 的文档](https://github.com/coredns/deployment/blob/master/kubernetes/Scaling_CoreDNS.md)。
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有关详细信息，请参阅有关[扩缩 CoreDNS 的文档](https://github.com/coredns/deployment/blob/master/kubernetes/Scaling_CoreDNS.md)。
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## {{% heading "whatsnext" %}}
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<!--
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You can configure [CoreDNS](https://coredns.io) to support many more use cases than
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kube-dns by modifying the `Corefile`. For more information, see the
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[CoreDNS site](https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/).
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kube-dns does by modifying the CoreDNS configuration ("Corefile").
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For more information, see the [documentation](https://coredns.io/plugins/kubernetes/)
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for the `kubernetes` CoreDNS plugin, or read the
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[Custom DNS Entries for Kubernetes](https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/)
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in the CoreDNS blog.
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-->
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你可以通过修改 `Corefile` 来配置 [CoreDNS](https://coredns.io)，以支持比 kube-dns 更多的用例。
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请参考 [CoreDNS 网站](https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/)
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你可以通过修改 CoreDNS 的配置（"Corefile"）来配置 [CoreDNS](https://coredns.io)，
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以支持比 kube-dns 更多的用例。
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请参考 `kubernetes` CoreDNS 插件的[文档](https://coredns.io/plugins/kubernetes/)
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或者 CoreDNS 博客上的博文
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[Custom DNS Entries for Kubernetes](https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/)，
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以了解更多信息。
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