keepalived实现IP地址高可用

yum -y install keepalived

vim /etc/keepalived/keepalived.conf

global_defs {  
   router_id LVS_DEVEL_nginx  # 设置lvs的id，在一个网络内应该是唯一的
}  
vrrp_instance VI_1 {  
    state BACKUP   #指定Keepalived的角色，MASTER为主，BACKUP为备          
    interface ens192  #指定Keepalived的角色，MASTER为主，BACKUP为备
    virtual_router_id 61  #虚拟路由编号，主备要一致
    priority 99  #定义优先级，数字越大，优先级越高，主DR必须大于备用DR    
    advert_int 1  #检查间隔，默认为1s
    authentication {  
        auth_type PASS  
        auth_pass 1111  
    }  
    virtual_ipaddress {  
        192.168.2.33  #定义虚拟IP(VIP)为192.168.2.33，可多设，每行一个
    }  
}  

　　systemctl start keepalived

yum安装后默认的日志在/var/log/message

tail -f /var/log/message查看keepalived开启跟关闭输出结果，当一主一备时，对外的虚拟IP地址飘在主上，当主挂了，IP地址飘向备，当主开启后，IP地址会从备飘向主