参考地址：https://www.cnblogs.com/xkops/p/6169034.html
1. 确保系统已经安装epel-release源
# yum -y install epel-release
2. 关闭防火墙服务和selinx，避免与docker容器的防火墙规则冲突
# systemctl stop firewalld
# systemctl disable firewalld
# setenforce 0
3. 安装配置Kubernetes Master
3.1 使用yum安装etcd和kubernetes-master
# yum -y install etcd kubernetes-master
node：在安装etcd之前确保 /etc/hosts 下的配置正确。
3.2 编辑 /etc/etcd/etcd.conf 文件
ETCD_NAME=default # 默认名称
ETCD_DATA_DIR="/var/lib/etcd/default.etcd" # 默认etcd数据目录
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379" # 主要0.0.0.0为监听的网卡地址，不要乱改
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379" # 连接的etc地址，本文是单机版的etcd，不用改变
3.3 编辑 /etc/kubernetes/apiserver 文件
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBELET_PORT="--kubelet-port=10250"
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
KUBE_API_ARGS=""
3.4 启动 etcd, kube-apiserver, kube-controller-manager, kube-scheduler 等服务，并设置开机启动。
# for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES ; done
注意：如果服务启动失败请运行 cat /usr/lib/systemd/system/$SERVICES 命令注意如下字段的信息提示：
[Service]
WorkingDirectory=/var/lib/kubelet
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/kubelet
ExecStart=/usr/bin/kubelet \
$KUBE_LOGTOSTDERR \
$KUBE_LOG_LEVEL \
$KUBELET_API_SERVER \
$KUBELET_ADDRESS \
$KUBELET_PORT \
$KUBELET_HOSTNAME \
$KUBE_ALLOW_PRIV \
$KUBELET_POD_INFRA_CONTAINER \
$KUBELET_ARGS
Restart=on-failure
对比各个参数配置，查找问题。
3.5 在etcd中定义flannel网络
# etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'
4. 安装配置Kubernetes Node
4.1 使用yum安装flannel和kubernetes-node
# yum -y install flannel kubernetes-node
4.2 为flannel网络指定etcd服务，修改 /etc/sysconfig/flanneld 文件
FLANNEL_ETCD="http://master:2379" # master地址
FLANNEL_ETCD_KEY="/atomic.io/network"
4.3 修改 /etc/kubernetes/config 文件
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://master:8080"# master地址
4.4 按照如下内容修改对应node的配置文件/etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname-override=node" #修改成对应Node的IP
KUBELET_API_SERVER="--api-servers=http://master:8080" #指定Master节点的API Server
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
KUBELET_ARGS=""
4.5 在所有Node节点上启动 kube-proxy,kubelet,docker,flanneld 等服务，并设置开机启动。
# for SERVICES in kube-proxy kubelet docker flanneld;do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done
5. 验证集群是否安装成功
在master上执行如下命令:
# kubectl get node
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