操作系統：CentOS 7
(1)關閉防火牆
systemctl disable firewalld
systemctl stop firewalld
(2)安裝etcd和kubernetes軟件（會自動安裝docker）
yum install -y etcd kubernetes
(3) kubernetes apiserver配置文件為/etc/kubernetes/apiserver，
把--admission-control參數中的ServiceAccount刪除
把KUBE_API_ADDRESS修改成 KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
(4)按順序啟動所有服務
systemctl start etcd
systemctl start docker
systemctl start kube-apiserver
systemctl start kube-controller-manager
systemctl start kube-scheduler
systemctl start kubelet
systemctl start kube-proxy