[zh] Update all md documents in the kubeadm

Signed-off-by: Gao Qian <gaoq.jy@fujitsu.com>

content/zh-cn/docs/setup/production-environment/tools/kubeadm/dual-stack-support.md

@@ -55,6 +55,8 @@ Services that you are planning to run.
 从 `2000::/3` 中选择一个全局的单播地址块。你不需要将集群的 IP 地址范围路由
 到公众互联网。
 
+所分配的 IP 地址数量应该与你计划运行的 Pod 和 Service 的数量相适应。
+
 {{< note >}}
 <!--
 If you are upgrading an existing cluster with the `kubeadm upgrade` command,

content/zh-cn/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

@@ -409,8 +409,8 @@ Install `kubeadm`, `kubelet`, `kubectl` and add a `kubelet` systemd service:
 RELEASE="$(curl -sSL https://dl.k8s.io/release/stable.txt)"
 ARCH="amd64"
 cd $DOWNLOAD_DIR
-sudo curl -L --remote-name-all https://storage.googleapis.com/kubernetes-release/release/${RELEASE}/bin/linux/${ARCH}/{kubeadm,kubelet,kubectl}
-sudo chmod +x {kubeadm,kubelet,kubectl}
+sudo curl -L --remote-name-all https://dl.k8s.io/release/${RELEASE}/bin/linux/${ARCH}/{kubeadm,kubelet}
+sudo chmod +x {kubeadm,kubelet}
 
 RELEASE_VERSION="v0.4.0"
 curl -sSL "https://raw.githubusercontent.com/kubernetes/release/${RELEASE_VERSION}/cmd/kubepkg/templates/latest/deb/kubelet/lib/systemd/system/kubelet.service" | sed "s:/usr/bin:${DOWNLOAD_DIR}:g" | sudo tee /etc/systemd/system/kubelet.service
@@ -419,8 +419,10 @@ curl -sSL "https://raw.githubusercontent.com/kubernetes/release/${RELEASE_VERSIO
 ```
 
 <!--
+Install `kubectl` by following the instructions on [Install Tools page](/docs/tasks/tools/#kubectl).
 Enable and start `kubelet`:
 -->
+请参照[安装工具页面](/zh-cn/docs/tasks/tools/#kubectl)的说明安装 `kubelet`。
 激活并启动 `kubelet`：
 
 ```bash

content/zh-cn/docs/setup/production-environment/tools/kubeadm/setup-ha-etcd-with-kubeadm.md

@@ -49,14 +49,20 @@ etcd cluster of three members that can be used by kubeadm during cluster creatio
 * Three hosts that can talk to each other over TCP ports 2379 and 2380. This document assumes these default ports. However, they are configurable through the kubeadm config file.
 -->
 * 三个可以通过 2379 和 2380 端口相互通信的主机。本文档使用这些作为默认端口。不过，它们可以通过 kubeadm 的配置文件进行自定义。
-
 <!--
 * Each host must have systemd and a bash compatible shell installed.
 * Each host must [have a container runtime, kubelet, and kubeadm installed](/docs/setup/production-environment/tools/kubeadm/install-kubeadm/).
 -->
 * 每个主机必须安装 systemd 和 bash 兼容的 shell。
 * 每台主机必须[安装有容器运行时、kubelet 和 kubeadm](/zh-cn/docs/setup/production-environment/tools/kubeadm/install-kubeadm/)。
-
+<!--
+* Each host should have access to the Kubernetes container image registry (`registry.k8s.io`) or list/pull the required etcd image using
+`kubeadm config images list/pull`. This guide will setup etcd instances as
+[static pods](/docs/tasks/configure-pod-container/static-pod/) managed by a kubelet.
+-->
+* 每个主机都应该能够访问 Kubernetes 容器镜像仓库 (registry.k8s.io)，
+  或者使用 `kubeadm config images list/pull` 列出/拉取所需的 etcd 镜像。
+  本指南将把 etcd 实例设置为由 kubelet 管理的[静态 Pod](/zh-cn/docs/tasks/configure-pod-container/static-pod/)。
 <!--
 * Some infrastructure to copy files between hosts. For example `ssh` and `scp` can satisfy this requirement.
 -->
@@ -368,7 +374,7 @@ on Kubernetes dual-stack support see [Dual-stack support with kubeadm](/docs/set
    ```shell
    docker run --rm -it \
    --net host \
-   -v /etc/kubernetes:/etc/kubernetes k8s.gcr.io/etcd:${ETCD_TAG} etcdctl \
+   -v /etc/kubernetes:/etc/kubernetes registry.k8s.io/etcd:${ETCD_TAG} etcdctl \
    --cert /etc/kubernetes/pki/etcd/peer.crt \
    --key /etc/kubernetes/pki/etcd/peer.key \
    --cacert /etc/kubernetes/pki/etcd/ca.crt \

content/zh-cn/docs/setup/production-environment/tools/kubeadm/troubleshooting-kubeadm.md

@@ -236,12 +236,6 @@ Right after `kubeadm init` there should not be any pods in these states.
   RBAC 特权或使用较新的版本。请在 Pod Network 提供商的问题跟踪器中提交问题，
   然后在此处分类问题。
 
-- 如果你安装的 Docker 版本早于 1.12.1，请在使用 `systemd` 来启动 `dockerd` 和重启 `docker` 时，
-  删除 `MountFlags=slave` 选项。
-  你可以在 `/usr/lib/systemd/system/docker.service` 中看到 MountFlags。
-  MountFlags 可能会干扰 Kubernetes 挂载的卷，并使 Pod 处于 `CrashLoopBackOff` 状态。
-  当 Kubernetes 不能找到 `var/run/secrets/kubernetes.io/serviceaccount` 文件时会发生错误。
-
 <!--
 ## `coredns` is stuck in the `Pending` state