openwrt部署keepalived

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

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