1、安装
系统：ubuntu1804
两个节点(us248,us249)都安装了nginx代理mysql（us251,us252,us253,us254）
sudo apt install keepalived
查看版本：keepalived -v
查看服务状态：sudo systemctl status keepalived
2、配置
参考/usr/share/doc/keepalived/keepalived.conf.说明
配置文件/etc/keepalived/keepalived.conf
global_defs {
router_id node1 #node2 备节点
}
vrrp_script chk_nginx {
script "killall -0 nginx"
interval 1
}
vrrp_instance vrrp1 {
state MASTER #BACKUP 备节点
interface ens33
virtual_router_id 51
priority 100 #90 备节点
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.240
}
track_script {
chk_nginx
}
}
3、测试
1）主从节点启动：
sudo systemctl restart keepalived
2）主节点检查是否有虚拟IP：192.168.1.240
ip a（VIP在主节点）
3）关闭主节点，从节点检查虚拟IP
ip a（VIP在从节点）
4）重启主节点，检查VIP
VIP回到了主节点
4、脑裂问题
TODO