refine k8s setup by kubeadm

Author: mfanjie

k8s-by-kubeadm/apt-key.gpg

@@ -1,9 +1,13 @@
 ## A basic instruction for Kubernetes setup and understanding
 1. cluster setup
+- 通过kubeadm安装，需要手工安装docker，kubelet，kubeadm等
+    - ubuntu安装 [kubeadmin-setup.md](k8s-by-kubeadm)
+      - 如果配置kubeadm有困难可参考 [Vagrantfile](Vagrantfile) @nevil
+    - centos安装 [kubeadm-centos7-install.md](kubeadm-centos7-install.md) @水果爸爸
+- 通过kind安装，全自动，无手工步骤，快捷简单，但是节点是基于容器而不是虚拟机的
+
+    [kind-setup.md](1.2.kind-setup.md)
 
-- [kubeadmin-setup.md](1.1.kubeadmin-setup.md)
-- [kind-setup.md](1.2.kind-setup.md)
-- [minikube-setup.md](1.minikube-setup.md)
 
 2. [understand-docker.md](2.understand-docker.md)
 3. [microservice.md](3.microservice.md)