Merge pull request #25444 from guzj11/patch-10

Update configure-dns-cluster.md

content/zh/docs/tasks/access-application-cluster/configure-dns-cluster.md

@@ -14,14 +14,19 @@ content_type: concept
 
 <!-- overview -->
 <!--
-Kubernetes offers a DNS cluster addon, which most of the supported environments enable by default.
+Kubernetes offers a DNS cluster addon, which most of the supported environments enable by default. In Kubernetes version 1.11 and later, CoreDNS is recommended and is installed by default with kubeadm.
 -->
 Kubernetes 提供 DNS 集群插件，大多数支持的环境默认情况下都会启用。
+在 Kubernetes 1.11 及其以后版本中，推荐使用 CoreDNS，
+kubeadm 默认会安装 CoreDNS。
 
 <!-- body -->
 <!--
-For more information on how to configure DNS for a Kubernetes cluster, see the [Kubernetes DNS sample plugin.](https://github.com/kubernetes/kubernetes/tree/release-1.5/examples/cluster-dns)
+For more information on how to configure CoreDNS for a Kubernetes cluster, see the [Customizing DNS Service](/docs/tasks/administer-cluster/dns-custom-nameservers/). An example demonstrating how to use Kubernetes DNS with kube-dns, see the [Kubernetes DNS sample plugin](https://github.com/kubernetes/examples/tree/master/staging/cluster-dns)
 -->
-有关如何为 Kubernetes 集群配置 DNS 的详细信息，请参阅 [Kubernetes DNS 插件示例.](https://github.com/kubernetes/kubernetes/tree/release-1.5/examples/cluster-dns)
+要了解关于如何为 Kubernetes 集群配置 CoreDNS 的更多信息，参阅 
+[定制 DNS 服务](/zh/docs/tasks/administer-cluster/dns-custom-nameservers/)。
+关于如何利用 kube-dns 配置 kubernetes DNS 的演示例子，参阅 
+[Kubernetes DNS 插件示例](https://github.com/kubernetes/examples/tree/master/staging/cluster-dns)。