MYSQL主从同步中Slave_IO_Running: No的问题

在master那边，执行：
flush logs;
show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |      154 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
记下File, Position。

在slave端，执行：
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000002', MASTER_LOG_POS=154;
slave start;
show slave status \G
可见:
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
说明主从已经关联。