实验环境
操作系统：CentOS Linux release 7.3.1611 (Core)
数据库系统： MySQL 5.7.19
部署mysql的ab复制的时候出现的UUID的问题，
mysql> show slave status\G;
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work.
问题提示主从使用了相同的server UUID，一个个的检查：
检查主从server_id
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 154 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
————————————————
检查从库的uuid
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 408 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
发现文件是一样的需要再查看别的
vim /var/lib/mysql/auto.cnf
[auto] server-uuid=4f37a731-9b79-11e8-8013-000c29f0700f
发现主从的这个auto.cnf中的uuid是一样的
解决办法
停止从库的mysql
systemctl stop mysqld
然后
所以删除或者是移走从库的auto.cnf
直接重启MySQL 集群
systemctl restart mysqld
进入到mysql的交互
直接查看是两个yes 直接成功
若是出现报错
Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'
可以
stop slave;
reset slave;
start slave;
一般的通过这几步骤就可以搞定了