canal 官网 : https://github.com/alibaba/canal/wiki/AdminGuide#user-content-ha%E6%A8%A1%E5%BC%8F%E9%85%8D%E7%BD%AE see-->ha 配置
参考:https://blog.csdn.net/my201110lc/article/details/78836270 (实测,可以)
