centos6 现在安装docker比较困难，很多依赖不满足，所以换用centos7安装
参考：https://www.cnblogs.com/763977251-sg/p/11837130.html
docker安装 yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine yum install -y yum-utils device-mapper-persistent-data lvm2 yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum makecache fastyum -y install docker-ce systemctl start docker k8s安装步骤（Centos7 三台VM）注：参考https://www.cnblogs.com/spll/p/10033316.html
vm1:master:192.168.31.111
vm2:node:192.168.31.112
vm3:node:192.168.31.113
安装master
yum -y install epel-release 关闭防火墙systemctl stop firewalld禁用防火墙systemctl disable firewalld 卸载docker，否则安装可能会失败；yum list installed | grep dockeryum remove -y docker-ce-* 将docker进行卸载yum -y install etcd kubernetes-master
安装完后修改etcd配置
vi /etc/etcd/etcd.conf
修改apiserver
vi /etc/kubernetes/apiserver #### kubernetes system config## The following values are used to configure the kube-apiserver## The address on the local server to listen to.KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"# The port on the local server to listen on.KUBE_API_PORT="--port=8080"# Port minions listen onKUBELET_PORT="--kubelet-port=10250"# Comma separated list of nodes in the etcd clusterKUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"# Address range to use for servicesKUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"# default admission control policiesKUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"# Add your own!KUBE_API_ARGS=""
配置完毕后，启动k8s进程
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES ; done
etcd注册flannel网络：
etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'
k8s node节点安装
yum -y install flannel kubernetes-node
给flannel指定etcd
vi /etc/sysconfig/flanneld
修改配置文件：
vi /etc/kubernetes/config
修改kublet配置
vim /etc/kubernetes/kubelet
启动node节点进程：
for SERVICES in kube-proxy kubelet docker flanneld;do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done
安装验证：
kubectl get nodes