OpenWRT VRRP协议配置： OpenWRT上需要安装keepalived，安装命令：
opkg update & opkg install keepalived然后，修改配置文件 /etc/keepalived/keepalived.conf，内容如下（没有就自行新建）：
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
interface br-lan #指定连接ROS的接口，默认为LAN接口的桥接
state BACKUP #默认状态是BACKUP，也可以指定为MASTER
virtual_router_id 51 #和ROS保持一致即可
priority 110 # 本机优先级为110，主路由，ROS优先级为100
advert_int 1
virtual_ipaddress {
192.168.88.8 # 虚拟网关地址，和ROS保持一致
}
}划重点#
OpenWrt安装后，启动时候会自动执行配置命令，故：每次配置完毕后，一旦重启OpenWrt，配置文件会丢失。解决办法是注释掉以下配置，代码位置：/etc/init.d/keepalived
reload_service() {
#process_config 这行代码是需要注释的
#SIGHUP is used by keepalived to do init.d reload
procd_send_signal keepalived
}
start_service() {
procd_open_instance
procd_set_param command /usr/sbin/keepalived
procd_append_param command -n # don't daemonize, procd will handle that for us
procd_append_param command -f "$KEEPALIVED_CONF"
#process_config 这行代码也是需要注释的
# set auto respawn behavior
procd_set_param respawn
procd_close_instance
}启动
/usr/sbin/keepalived -n -f /etc/keepalived/keepalived.conf(可略，参见下面的附录) 查看服务情况ps -ef | grep keepalived查看服务状态service keepalived status重载配置文件service keepalived reload启动服务service keepalived start停止服务service keepalived stop
附录：
由于keepalived启动时候指定了配置文件，故在
/etc/init.d/keepalived文件的首几行可以修改指定配置文件
#KEEPALIVED_CONF=/tmp/keepalived.conf 这行注释掉，或者改成如下：
KEEPALIVED_CONF=/etc/keepalived/keepalived.conf这样，Openwrt重启后，配置文件就不会丢失且会自动按配置文件/etc/keepalived/keepalived.conf来启动keepalived
补充阅读#
补充 OpenWrt keepalived 部署的角色、虚拟地址与故障切换验证思路。
如何理解与使用#
先明确哪台是主节点、哪台是备用节点，以及虚拟 IP 所在接口；配置文件相似并不说明两个节点已互相感知。
验证与边界#
分别检查正常持有虚拟地址、主节点故障与恢复后的行为，再用实际客户端测试访问。验证应包括切换期间业务可用性，而不只看进程状态。