Mysql主从同步出现server-id冲突怎么办？

#这个报错出现之后，就看一目了然看到两台机器的 server-id 是一样的。
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)