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报错:
1)
change master导致的:
              Last_IO_Error: error connecting to master "repl1@IP:3306" - retry-time: 60  retries2)    
在没有解锁的情况下停止slave进程:
     mysql> stop slave;
ERROR 1192 (HY000): Can"t execute the given command because you have active locked tables or an active transaction3)
change master语法错误,落下逗号
mysql> change master to
    -> master_host="IP"
    -> master_user="USER",
    -> master_password="PASSWD",
    -> master_log_file="mysql-bin.000002",
    -> master_log_pos=106;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near "master_user="USER",
master_password="PASSWD",
master_log_file="mysql-bin.000002" at line 3 4)
在没有停止slave进程的情况下change master
mysql> change master to master_host=‘IP", master_user="USER", master_password="PASSWD", master_log_file="mysql-bin.000001",master_log_pos=106;
ERROR 1198 (HY000): This operation cannot be performed with a running slave; run STOP SLAVE first 5)
A B的server-id相同:
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids;
these ids must be different for replication to work (or the --replicate-same-server-id option must be used on
slave but this does not always make sense; please check the manual before using it).
查看server-id
mysql> show variables like "server_id";
手动修改server-id
mysql> set global server_id=2; #此处的数值和my.cnf里设置的一样就行
mysql> slave start; 6)change master之后,查看slave的状态,发现slave_IO_running 为NO
需要注意的是,做完上述操作之后最后重启mysql进程MySQL自动增长字段的设置MySQL互为主从复制详解----mysql-mm相关资讯      MySQL数据库教程 
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