mysql> grant replication slave,replication client on *.* to repl@'10.12.%'

 -> identified by '123456';
Query OK, 0 rows affected (0.03 sec)

mysql> CHANGE MASTER TO MASTER_HOST='10.12.128.19',MASTER_PORT=3306,MASTER_USER='repl', 
MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql-bin.000006', MASTER_LOG_POS=451;

#查看复制的状态
mysql> show slave status\G

*************************** 1. row ***************************
    Slave_IO_State: Waiting for master to send event
     Master_Host: 10.12.128.19
     Master_User: repl
     Master_Port: 3306
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000006
   Read_Master_Log_Pos: 1512
    Relay_Log_File: relay_index.000002
    Relay_Log_Pos: 283
  Relay_Master_Log_File: mysql-bin.000006
    Slave_IO_Running: Yes
   Slave_SQL_Running: Yes
    Replicate_Do_DB: 
   Replicate_Ignore_DB: 
   Replicate_Do_Table: 
  Replicate_Ignore_Table: 
  Replicate_Wild_Do_Table: 
 Replicate_Wild_Ignore_Table: 
     Last_Errno: 0
     Last_Error: 
     Skip_Counter: 0
   Exec_Master_Log_Pos: 1512
    Relay_Log_Space: 452
    Until_Condition: None
    Until_Log_File: 
    Until_Log_Pos: 0
   Master_SSL_Allowed: No
   Master_SSL_CA_File: 
   Master_SSL_CA_Path: 
    Master_SSL_Cert: 
   Master_SSL_Cipher: 
    Master_SSL_Key: 
  Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
    Last_IO_Errno: 0
    Last_IO_Error: 
    Last_SQL_Errno: 0
    Last_SQL_Error: 
 Replicate_Ignore_Server_Ids: 
    Master_Server_Id: 3306
     Master_UUID: 97f33396-ed12-11e4-921a-000c29e8ee06
    Master_Info_File: /mydata/data5.6/master.info
     SQL_Delay: 0
   SQL_Remaining_Delay: NULL
  Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
   Master_Retry_Count: 86400
     Master_Bind: 
  Last_IO_Error_Timestamp: 
  Last_SQL_Error_Timestamp: 
    Master_SSL_Crl: 
   Master_SSL_Crlpath: 
   Retrieved_Gtid_Set: 
   Executed_Gtid_Set: 
    Auto_Position: 0
1 row in set (0.00 sec)

#启动复制
mysql> start slave;

install plugin rpl_semi_sync_master soname 'semisync_master.so';

install plugin rpl_semi_sync_slave soname 'semisync_slave.so';

set global rpl_semi_sync_master_enabled = 1;
set global rpl_semi_sync_master_timeout = 100; //以毫秒计算

set global rpl_semi_sync_slave_enabled = ON;

stop slave IO_thread;
start slave IO_thread;

mysql> show global status like 'rpl%';

+--------------------------------------------+-------+
| Variable_name        | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients    | 1  |
| Rpl_semi_sync_master_net_avg_wait_time  | 0  |
| Rpl_semi_sync_master_net_wait_time   | 0  |
| Rpl_semi_sync_master_net_waits    | 0  |
| Rpl_semi_sync_master_no_times    | 1  |
| Rpl_semi_sync_master_no_tx     | 8  |
| Rpl_semi_sync_master_status    | ON |
| Rpl_semi_sync_master_timefunc_failures  | 0  |
| Rpl_semi_sync_master_tx_avg_wait_time  | 0  |
| Rpl_semi_sync_master_tx_wait_time   | 0  |
| Rpl_semi_sync_master_tx_waits    | 0  |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0  |
| Rpl_semi_sync_master_wait_sessions   | 0  |
| Rpl_semi_sync_master_yes_tx    | 0  |
+--------------------------------------------+-------+
14 rows in set (0.04 sec)

mysql> show global status like 'rpl%';

+----------------------------+-------+
| Variable_name    | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | ON |
+----------------------------+-------+
1 row in set (0.04 sec)