• 基于Ubuntu20.04.01

1.主、备节点分别安装

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apt-cache search keepalived
keepalived - Failover and monitoring daemon for LVS clusters
apt-get install keepalived

2.主、备节点分别配置

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cd /usr/sbin/keepalived
vim /etc/keepalived/keepalived.conf
chmod 644 keepalived.conf

1>主机：

global_defs {
        router_id web1
}
vrrp_instance VI_1 {
   state MASTER
   interface ens33 #ifconfig确定
   virtual_router_id 55
   priority 100
   advert_int 1
   authentication {
       auth_type PASS
       auth_pass 123456
   }
   virtual_ipaddress {
       192.168.3.200 # 虚拟ip
   }
}

virtual_server 192.168.3.200 3306 {
 delay_loop 2
 #lb_algo rr              #LVS算法，用不到，我们就关闭了
 #lb_kind DR              #LVS模式，如果不关闭，备用服务器不能通过VIP连接主MySQL
 persistence_timeout 50  #同一IP的连接60秒内被分配到同一台真实服务器
 protocol TCP
 real_server 192.168.3.181 3306 {   #检测本地mysql，backup也要写检测本地mysql
 weight 3
 notify_down /etc/keepalived/mysql_down.sh    #当mysq服down时，执行此脚本，杀死keepalived实现切换
 TCP_CHECK {
 connect_timeout 10    #连接超时
 nb_get_retry 3       #重试次数
 delay_before_retry 3 #重试间隔时间
connect_port 3306
  }
}

2>备机：

vim /etc/keepalived/keepalived.conf
chmod 644 keepalived.conf

global_defs {
        router_id web2
}
vrrp_instance VI_1 {
   state BACKUP
   interface ens33 #ifconfig确定
   virtual_router_id 55
   priority 50
   advert_int 1
   authentication {
       auth_type PASS
       auth_pass 123456
   }
   virtual_ipaddress {
       192.168.3.200 # 虚拟ip
   }
}

virtual_server 192.168.3.200 3306 {
 delay_loop 2
 #lb_algo rr              #LVS算法，用不到，我们就关闭了
 #lb_kind DR              #LVS模式，如果不关闭，备用服务器不能通过VIP连接主MySQL
 persistence_timeout 50  #同一IP的连接60秒内被分配到同一台真实服务器
 protocol TCP
 real_server 192.168.3.182 3306 {   #检测本地mysql，backup也要写检测本地mysql
 weight 3
 notify_down /etc/keepalived/mysql_down.sh    #当mysq服down时，执行此脚本，杀死keepalived实现切换
 TCP_CHECK {
 connect_timeout 10    #连接超时
 nb_get_retry 3       #重试次数
 delay_before_retry 3 #重试间隔时间
connect_port 3306
  }
}

3..主、备节点分别添加脚本

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vim /etc/keepalived/mysql_down.sh
#!/bin/bash
pkill keepalived

4..主、备节点分别启动

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/etc/init.d/keepalived start

5.验证

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ip addr在主机上有飘逸IP 3.200
当关闭主机，飘逸IP则出现在备机