准备：
1、A-centos(192.168.6.177) 端口为9898的服务
2、B-ubuntu(192.168.6.182) 端口为9898的服务
3、keepalived安装包https://www.keepalived.org/software/keepalived-1.4.0.tar.gz
安装参考：https://blog.csdn.net/cuiyaoqiang/article/details/79412599
配置理解：https://blog.51cto.com/13055758/2071439?from=timeline
服务启动
service keepalived start
如果报错，参考
https://blog.csdn.net/zsg88/article/details/76690847
我遇到的错误和https://blog.csdn.net/zsg88/article/details/76690847不一样，但是可以参考
我发现报错信息中提示：
Unable to find configuration file /etc/keepalived/keepalived.conf (glob returned 3)
所有我执行了以下命令：
mkdir /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
systemctl start keepalived.service
systemctl status keepalived.service
然后keepalived服务就运行起来了