目录

1.部署 CoreDNS

2.在master01节点基础上，完成master02节点部署

3.部署nginx做负载均衡器

4.部署keepalived做高可用

---

1.部署 CoreDNS

CoreDNS：CoreDNS 是 Kubernetes 的默认 DNS 实现。可以为 K8S 集群内的 Pod 提供 DNS 服务。
使用 CoreDNS 可以为集群中的 service 资源创建一个资源名称 与 ClusterIP 的对应关系解析，从而避免将 service 的 ClusterIP 地址硬编码到应用程序代码中。

两个node节点操作
cd /opt/k8s/
上传coredns.tar包
docker load -i coredns.tar

master01节点操作
cd /opt/k8s/
上传coredns.yaml压缩包
kubectl apply -f coredns.yaml
kubectl get pods -A

2.在master01节点基础上，完成master02节点部署

master01节点
cd /opt
scp -r etcd/ kubernetes/ master02:/opt
cd
scp -r .kube/ master02:/root
cd /usr/lib/systemd/system
scp kube-* master02:`pwd`

cd /usr/local/bin/
scp kubectl master02:/usr/local/bin/

master02节点
cd
cd .kube/
rm -rf cache/

cd /opt/kubernetes/
rm -f logs/*

master02节点
cd /opt/kubernetes/cfg/
vim kube-apiserver
修改为本机ip

systemctl enable --now kube-apiserver.service kube-controller-manager.service kube-scheduler.service 
systemctl status kube-apiserver.service kube-controller-manager.service kube-scheduler.service

查看验证master02节点
kubectl get nodes
kubectl get pods -A
kubectl get svc

3.部署nginx做负载均衡器

192.168.9.114、192.168.9.115两台服务器做负载均衡
初始化操作
systemctl disable --now firewalld
setenforce 0

两台服务器安装nginx
cd /etc/yum.repos.d/
上传nginx.repo包
yum install -y nginx

192.168.9.114服务器
cd /etc/nginx/
vim nginx.conf 
#10行添加     use epoll;
#14行开始添加
stream {
      upstream k8s-apiservers {
         server 192.168.9.112:6443;
         server 192.168.9.116:6443;
      }
      server {
         listen 6443;
         proxy_pass k8s-apiservers;
      }
  }


nginx -t
systemctl enable --now nginx
netstat -lntp | grep nginx

scp nginx.conf 192.168.9.115:`pwd`

192.168.9.115服务器
systemctl enable --now nginx
netstat -lntp | grep nginx

4.部署keepalived做高可用

192.168.9.114、192.168.9.115两台服务器做高可用
yum install -y keepalived

192.168.9.114服务器
cd /etc/keepalived/
cp keepalived.conf keepalived.conf.bak
touch nginx_check.sh
vim nginx_check.sh
#!/bin/bash

if ! killall -0 nginx &> /dev/null
    then
    systemctl stop keepalived
fi

chmod +x nginx_check.sh

vim keepalived.conf
#10行修改
smtp_server 127.0.0.1
#12行修改
router_id NGINX_01
删除原本13-16行

#15行添加
vrrp_script nginx_check {
     script "/etc/keepalived/nginx_check.sh"
     weight 2
     interval 2
}

#23行修改为本机网卡
interface ens33
#32行修改为指定vip         
192.168.9.100
#34行添加
track_script {
         nginx_check
}


scp keepalived.conf nginx_check.sh 192.168.9.115:`pwd`

192.168.9.115服务器
cd /etc/keepalived/
vim keepalived.conf
#12行修改
router_id NGINX_02
#22行修改
state BACKUP
#25行修改
priority 90

两台keepalived服务器开启服务
systemctl enable --now keepalived.service

验证keepalived高可用

192.168.9.114服务器操作

192.168.9.115服务器查看vip

将vip漂移至原节点使用

systemctl start nginx keepalived.service ，于192.168.9.114节点操作即可恢复

//修改两个node节点上的bootstrap.kubeconfig,kubelet.kubeconfig配置文件为VIP
cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig 
server: https://192.168.9.100:6443
                      
vim kubelet.kubeconfig
server: https://192.168.9.100:6443
                        
vim kube-proxy.kubeconfig
server: https://192.168.9.100:6443

//重启kubelet和kube-proxy服务
systemctl restart kubelet.service 
systemctl restart kube-proxy.service

netstat -natp | grep nginx

若客户端工具也想通过vip链接，可对两个master节点进行以下修改

cd
vim .kube/config
server: https://192.168.9.100:6443