【README】

1.本文po出了报错【message=XXX' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'】的解决方法；

2.解决方法参考了 StackOverflow： mysql - How to unblock with mysqladmin flush hosts - Stack Overflowhttps://stackoverflow.com/questions/22285318/how-to-unblock-with-mysqladmin-flush-hosts3. 我今天连续3次都碰到这个问题，所以单独记录下问题解决方法。

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【1】查看canal服务器实例的日志

1）以 example实例为准，查看路径如下：

[root@centos201 example]# pwd
/usr/software/canal/logs/example
[root@centos201 example]# ll
total 1808
-rw-r--r--. 1 root root 1846033 Sep 17 18:15 example.log
-rw-r--r--. 1 root root    1774 Sep 17 18:00 meta.log

2）错误日志如下：

Caused by: java.io.IOException: handshake exception:
ErrorPacket [errorNumber=1129, fieldCount=-1, message=192.168.163.201' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts', sqlState=ost ', sqlStateMarker=H]at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.negotiate(MysqlConnector.java:168) ~[canal.parse.driver-1.1.6.jar:na]at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.connect(MysqlConnector.java:82) ~[canal.parse.driver-1.1.6.jar:na]... 4 common frames omitted

message=192.168.163.201' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'

【日志解释】

•     大致说 192.168.163.201 被阻塞了，需要执行 mysqladmin flush-hosts 解除阻塞；
•     在mysql上执行 FLUSH HOSTS;  即可。

• FLUSH HOSTS;