1.当删除binlog.00000x 日志可能mysql再启动不了，需要把binlog.index清空

2.Mysql重新安装或者安装高版本的时候，canal启动报错

2020-07-06 07:10:39.236 [destination = example , address = bigdata101/192.168.1.96:3306 ,
 EventParser] ERROR c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - dump address bigdata101/192.168.1.96:3306 has an error, retrying. caused by 
java.io.IOException: Received error packet: errno = 1236, 
sqlstate = HY000 errmsg = Could not find first log file name in binary log index file

解决办法：/opt/module/canal/conf/example/ meta.dat 删除

Mysql8 默认开启binlog和format=row
使用Canal需要在mysql my.conf中增添 service-id

3.Canal HA 第二台机器报错

1.提高允许的max_connection_errors数量（治标不治本）：

① 进入Mysql数据库查看max_connection_errors：

show variables like '%max_connection_errors%';

② 修改max_connection_errors的数量为1000：

 set global max_connect_errors = 1000;

2.第二步可以在数据库中进行，命令如下：

flush hosts;

附加：Canal HA配置

修改canal.properties文件

canal.zkServers=192.168.207.141:2181,192.168.207.142:2181,192.168.207.143:2181

修改instance.properties文件

canal.instance.mysql.slaveId = 1234 #两台不一样

position info

canal.instance.master.address = 192.168.207.141:3306
canal.instance.dbUsername = root
canal.instance.dbPassword = 123456

canal.instance.defaultDatabaseName = canal

canal.instance.connectionCharset = UTF-8