1) change master导致的: Last_IO_Error: error connecting to master "repl1@IP:3306" - retry-time: 60 retries 2) 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 transaction 3) 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