在线开启步骤：

首先查询gtid状态

mysql> show variables like '%gtid%';

+----------------------------------+-----------+

| Variable_name | Value |

+----------------------------------+-----------+

| binlog_gtid_simple_recovery | ON |

| enforce_gtid_consistency | ON |

| gtid_executed_compression_period | 1000 |

| gtid_mode | OFF |

| gtid_next | AUTOMATIC |

| gtid_owned | |

| gtid_purged | |

| session_track_gtids | OFF |

+----------------------------------+-----------+

8 rows in set (0.01 sec)

1、要求：

(1)必须是5.7.6版本以上的mysql

(2)GTID状态为OFF

2、开启步骤：

(1)：SET GLOBAL ENFORCE_GTID_CONSISTENCY = 'WARN';

(2)：SET GLOBAL ENFORCE_GTID_CONSISTENCY = 'ON';

(3)：SET GLOBAL GTID_MODE = 'OFF_PERMISSIVE';

(4)：SET GLOBAL GTID_MODE = 'ON_PERMISSIVE';

(5)：SET GLOBAL GTID_MODE = 'ON';

3、要永久启用，在my.cnf配置文件中添加参数：

gtid-mode=ON

enforce-gtid-consistency

mysql> show variables like '%gtid%';

+----------------------------------+-----------+

| Variable_name | Value |

+----------------------------------+-----------+

| binlog_gtid_simple_recovery | ON |

| enforce_gtid_consistency | ON |

| gtid_executed_compression_period | 1000 |

| gtid_mode | ON |

| gtid_next | AUTOMATIC |

| gtid_owned | |

| gtid_purged | |

| session_track_gtids | OFF |

+----------------------------------+-----------+

在线关闭步骤：

1、要求：

(1)必须是5.7.6版本以上的mysql

(2)GTID状态为OFF

2、关闭步骤：

(1)：stop slave;

(2)：SET GLOBAL GTID_MODE = 'ON_PERMISSIVE';

(3)：SET GLOBAL GTID_MODE = 'OFF_PERMISSIVE';

(4)：SET GLOBAL GTID_MODE = 'OFF';

mysql> show variables like '%gtid%';

+----------------------------------+-----------+

| Variable_name | Value |

+----------------------------------+-----------+

| binlog_gtid_simple_recovery | ON |

| enforce_gtid_consistency | ON |

| gtid_executed_compression_period | 1000 |

| gtid_mode | OFF |

| gtid_next | AUTOMATIC |

| gtid_owned | |

| gtid_purged | |

| session_track_gtids | OFF |

+----------------------------------+-----------+

8 rows in set (0.01 sec)

注：

每次开启和关闭时，都是这样一个过程：

打开-->过度模式-->完全打开

停止-->过度模式-->完全关闭