环境要求

• OS环境：centos 7
• kubernetes版本：v1.7.2
• docker版本
  
  • version:1.12.6
  • go version: go1.6.4
  • API version: 1.24

注意：docker 版本不能用最新版本，否则不兼容1.7的k8s.

需要准备的安装包

• k8s 需要的安装包（Download）
  
• docker 安装包（Download）

k8s组件镜像

1.7版本的k8s组件都运行在pod里，例如flannel,etcd,apiserver等都以镜像方式启动。（Download）

部署步骤

• 安装Docker

tar zxf docker.tar.gz -C 
yum localinstall -y docker/*.rpm

#配置docker
setenforce 0
sed -i -e 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

#关闭防火墙，这步不能少
systemctl disable firewalld
systemctl stop firewalld
echo DOCKER_STORAGE_OPTIONS=\" -s overlay --selinux-enabled=false\" > /etc/sysconfig/docker-storage

#配置docker私有库地址，如果没有的话可以不要执行改命令
sed -i -e 's/dockerd/dockerd --insecure=registry=192.168.31.85:5523/g' /usr/lib/systemd/system/docker.service

systemctl daemon-reload && systemctl restart docker.service

• 安装k8s

#首先将k8s安装包copy到k8s目录中
yum localinstall -y k8s/*.rpm
rm -rf k8s
# 改变 kubelet 的 cgroup-driver 需要与docker一致（docker version查看）
sed -i -e 's/cgroup-driver=systemd/cgroup-driver=cgroupfs/g' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
systemctl enable kubelet.service && systemctl start kubelet.service && rm -rf /etc/kubernetes

• 配置启动master

kubeadm init --kubernetes-version=v1.7.2 --pod-network-cidr=10.96.0.0/12
#环境变量设置
export KUBECONFIG=/etc/kubernetes/admin.conf
source ~/.bashrc
#安装flannel network
kubectl create -f create kube-flannel-rbac.yml
kubectl create -f kube-flannel.yml --namespace=kube-system

• node节点注册到master

#--skip-preflight-checks参数需要带上
kubeadm join --skip-preflight-checks --token=token masterIP:6443

此时k8s集群搭建好了，如果不出意外的话，使用kubectl get nodes 能看到集群节点信息。

思考

这样安装方式对于一个庞大的集群来说明显不满足要求的，下面本人写了一个自动部署脚本，自需要传入集群节点的ip user password 就能自动部署一个k8s集群。（在测试过程中脚本有些问题，因作业繁忙暂时没有进行调试，个人觉得思路没有问题，仅参考）

#------------------------------------安装Master------------------------------------
systemctl disable firewalld && systemctl stop firewallddcoer

#安装docker
curl -L http://$HTTP_SERVER/install_docker.sh | bash -s $HTTP_SERVER $PRIVATE_REGISTRY

#安装kubernetes
curl -L http://$HTTP_SERVER/install_k8s.sh > /tmp/k8s/install_k8s.sh
chmod +x /tmp/k8s/install_k8s.sh
/tmp/k8s/install_k8s.sh

# Change cgroup-driver for kubelet
sed -i -e 's/cgroup-driver=systemd/cgroup-driver=cgroupfs/g' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
systemctl enable kubelet.service && systemctl start kubelet.service &&

#设置hosts 欺骗kubeadm
echo $HTTP_SERVER storage.googleapis.com >> /etc/hosts
# 这里一定要带上--pod-network-cidr参数，不然后面的flannel网络会出问题
export KUBE_ETCD_IMAGE=gcr.io/google_containers/etcd-amd64:3.0.17
kubeadm init --kubernetes-version=v1.7.2 --pod-network-cidr=10.96.0.0/12
export KUBECONFIG=/etc/kubernetes/admin.conf
# install flannel network
kubectl apply -f http://$HTTP_SERVER/yaml/kube-flannel-rbac.yml
kubectl apply -f http://$HTTP_SERVER/yaml/kube-flannel.yml --namespace=kube-system
#install dashboard
kubectl create -f http://$HTTP_SERVER/yaml/kubernetes-dashboard.yml
# show pods
kubectl get po --all-namespaces
# show tokens
result=`kubeadm token list`
temp=${result##*DESCRIPTION}
token=${temp%%<forever*}
echo token:$token
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bashrc
source ~/.bashrc

#-------------------------------------安装minion-----------------------------------------
curl -L http://$HTTP_SERVER/login.sh > /tmp/k8s/login.sh
chmod +x /tmp/k8s/login.sh
for((i=2;i<=$#;i++));
  do
      param=${!i}
      host=${param%%/*}
      user=${host%%/*}
      psw=${user%%/*}
      /tmp/k8s/login.sh $host $user $psw $token $PRIVATE_REGISTRY $1:6443
  done

• login.sh

#!/usr/bin/expect -f
set hostname [lindex $argv 0]
set user [lindex $argv 1]
set passwd [lindex $argv 2]
set server [lindex $argv 3]
set token [lindex $argv 4]
set master [lindex $argv 5]
set registry [lindex $argv 6]
set timeout 20
spawn ssh $user@$hostname
expect {
 "*continue connecting (yes/no)?" { send "yes\r" }
 "*password*" { send "$passwd\r" }
}
expect {
 "*continue connecting (yes/no)?" { send "yes\r" }
 "*password*" { send "$passwd\r" }
}
expect "#"
send "curl -L http://$server/install.sh | bash -s $server $registry $token $master\r"
expect "#"
send "exit\r"

• install_k8s.sh
• install_minion.sh