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 fast
yum -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 docker
yum 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 on
KUBELET_PORT="--kubelet-port=10250"

# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

# default admission control policies
KUBE_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