负载均衡实现故障vip自动漂移

环境说明演示vip自动漂移

192.168.237.50

192.168.237.51

vip: 192.168.237.5

keepalived开源软件实现

keepalived可以实现当vip挂的时候，自动漂移，基于vrrp虚拟路由冗余协议

主备，vrrp去宣告

keepalived主服务器的配置/usr/local/keepalived/etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 666666
    }
    virtual_ipaddress {
        192.168.237.5/24
    }
}

vrrp_instance配置，配置vip
state 配置主或者备
interface 配置vip使用的物理网卡
virtual_router_id 虚拟路由id
priority 权重配置，主的权重比备的高
advert_int 主每2s发个vrrp包，说明自己正常
authentication 认证信息
virtual_ipaddress 配置vip

检查配置，启动keepalived
/usr/local/keepalived/sbin/keepalived -t -f /usr/local/keepalived/etc/keepalived/keepalived.conf
/usr/local/keepalived/sbin/keepalived -f /usr/local/keepalived/etc/keepalived/keepalived.conf

keepalived备服务器的配置/usr/local/keepalived/etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 99
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 666666
    }
    virtual_ipaddress {
        192.168.237.5/24
    }
}

抓包可以看到vrrp协议

验证keepalived的vip自动漂移

存在问题

主起来后又会接管vip

vip的频繁漂移对于我们不太有利