keepalived 超过 20 个VIP

很多业务都会使用 keepalived 做高可用, 由于业务调整, keepalived 需要维护 100 VIP, 直接修改 virtual_ipaddress 配置文件

virtual_ipaddress {
 1.1.1.1/24 brd 1.1.1.255 dev eth0
 1.1.1.2/24 brd 1.1.1.255 dev eth0
 1.1.1.3/24 brd 1.1.1.255 dev eth0
 1.1.1.4/24 brd 1.1.1.255 dev eth0  
 1.1.1.5/24 brd 1.1.1.255 dev eth0  
 # 忽略90条  
 1.1.1.96/24 brd 1.1.1.255 dev eth0  
 1.1.1.97/24 brd 1.1.1.255 dev eth0  
 1.1.1.98/24 brd 1.1.1.255 dev eth0  
 1.1.1.99/24 brd 1.1.1.255 dev eth0  
 1.1.1.100/24 brd 1.1.1.255 dev eth0
}

重启keepalived服务后发现, 只有 20 个 ip, 绑定到 eth0 接口上

# tail /var/log/messages
Feb 12 08:45:14 xxxxx  Keepalived_vrrp[12452]:   => Declare others VIPs into the excludedvip block
Feb 12 08:45:14 xxxxx  Keepalived_vrrp[12452]: VRRP_Instance(VI_1) trunc to the first 20 VIPs.
Feb 12 08:45:14 xxxxx  Keepalived_vrrp[12452]:   => Declare others VIPs into the excludedvip block
Feb 12 08:45:14 xxxxx  Keepalived_vrrp[12452]: VRRP_Instance(VI_1) trunc to the first 20 VIPs.

查看官方文档后,发现 vip 最多支持 20 个 http://www.keepalived.org/changelog.html

VRRP packet lenght are limited to a 20 VIPs, if you want more VRRP VIPs
add them to the "virtual_ipaddress_excluded" configuration block.

文档也已经说明 VRRP(虚拟路由器冗余协议) 限制 20 VIP, 如果需要更多, 请使用 virtual_ipaddress_excluded 配置,

virtual_ipaddress {
 1.1.1.1/24 brd 1.1.1.255 dev eth0
 1.1.1.2/24 brd 1.1.1.255 dev eth0
 1.1.1.3/24 brd 1.1.1.255 dev eth0
}

virtual_ipaddress_excluded {
 1.1.1.4/24 brd 1.1.1.255 dev eth0
 1.1.1.5/24 brd 1.1.1.255 dev eth0
 # 忽略90条
 1.1.1.96/24 brd 1.1.1.255 dev eth0
 1.1.1.97/24 brd 1.1.1.255 dev eth0
 1.1.1.98/24 brd 1.1.1.255 dev eth0
 1.1.1.99/24 brd 1.1.1.255 dev eth0
 1.1.1.100/24 brd 1.1.1.255 dev eth0
}

重启服务后, ip address 看到所有ip了, 不过virtual_ipaddress_excluded只做 ip绑定, 不做心跳检查.

另外看到其他人使用 notify_master, 和 notify_backup 同样也可以实现超过 20 VIP

notify_master   /scripts/add_vip.sh    #添加VIP的脚本
notify_backup   /scripts/del_vip.sh    #删除VIP的脚本

254个VIP时脚本生成keepalived.conf配置文件

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