keepalived+LVS ---高可用

实验环境 VS/DR

• 该实验的的架构图为：
  

• 环境：需要五台服务器，两台用来作为LVS，两台用来作为server端，一台作为客户端

• 关闭防火墙和seliunx

systemctl stop firewalld && setenforce 0

配置server-1和server-2

• 安装nginx,
  如果你想要安装nginx,请点击nginx–编译安装或nginx—yum安装
• 修改配置文件

echo "验证内容" >/usr/share/nginx/html/index.html

• 启动nginx

systemctl start nginx

• 在lo接口上绑定VIP

 ip addr add dev lo 192.168.92.222/32

配置LVS

• 安装keepalived和ipvsadm

yum -y install ipvsadm keepalived

• 重新创建keepalived的配置文件。（将原有的删除）

vim /etc/keepalived/keepalived.conf 

 ! Configuration File for keepalived

global_defs {
   router_id lvs-keepalived-master    #辅助改为lvs-backup
}

vrrp_instance VI_1 {
    state MASTER               #备  改为BACKUP
    interface ens33                #VIP绑定接口
    virtual_router_id 80         #VRID 同一组集群，主备一致          
    priority 100            #本节点优先级，辅助改为50
    advert_int 1            #检查间隔，默认为1s
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.92.222/32          #要保持同网段
    }
}
virtual_server 192.168.92.222 80 {    #LVS配置
	delay_loop 3
	lb_algo rr     #LVS调度算法
	lb_kind DR     #LVS集群模式（路由模式）
	nat_mask 255.255.255.0
	persistence_timeout 20  #持久性连接
	protocol TCP      #健康检查使用的协议
	real_server 192.168.92.128 80 {            #server端的IP
		weight 1
		inhibit_on_failure   #当该节点失败时，把权重设置为0，而不是从IPVS中删除
		TCP_CHECK {          #健康检查
			connect_port 80   #检查的端口
			connect_timeout 3  #连接超时的时间
			}
		}
	real_server 192.168.92.129 80 {             #server端的ip
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_timeout 3
			connect_port 80
			}
		}
}
                       # 将其拷贝到LVS-2.做相应的修改

设置VIP

• 添加vip

ip addr add dev ens33 192.168.92.222/32       #设置VIP
ipvsadm -S > /etc/sysconfig/ipvsadm
systemctl start ipvsadm
ipvsadm -A -t 192.168.92.222:80 -s rr 
ipvsadm -a -t 192.168.92.222:80 -r 192.168.92.128  -g 
ipvsadm -a -t 192.168.92.222:80 -r 192.168.92.129  -g    #server端的IP

• 启动keepalived并设置开机自启

systemctl start keepalived
systemctl enable keepalived

• 查看相关配置

 ipvsadm  -ln  

检测

在客户端通过vip访问