MySQL5.7在线开启/关闭GTID

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MySQL5.7 在线开启 / 关闭 GTID

环境介绍
Part1: 写在最前

截止本文撰写当日，MySQL5.7.16 是官网的最新稳定版，本文将用 MySQL5.7.16 来进行演示。从 MySQL5.6 开始，支持了 GTID 复制模式，这种模式其实是把双刃剑，虽然容易搭建主从复制了，但使用不当，就容易出现一些错误，例如 error 1236。在 MySQL5.6 如果开启 GTID 模式，需要在 my.cnf 中加入以下几个参数：

①log-bin=mysql-bin

②binlog_format=row

③log_slave_updates=1

④gtid_mode=ON

⑤enforce_gtid_consistency=ON

Warning: 警告这里的一些参数不是动态参数，也就是需要重启 mysql 才能生效。

Part2: 环境

[root@HE1 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.16-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql> select version();
+————+
| version() |
+————+
| 5.7.16-log |
+————+
1 row in set (0.00 sec)
mysql> show global variables like ‘log_slave%’;
+——————-+——-+
| Variable_name | Value |
+——————-+——-+
| log_slave_updates | OFF |
+——————-+——-+
1 row in set (0.00 sec)

MySQL5.6 开启 GTID 需要开启 log_slave_updates 参数，否则启动报错，而 5.7 不在需要开启该参数。

实战
Part1: 搭建传统复制模式

本文环境 HE1 为从，HE3 为主库

[root@HE1 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.16-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.250
Master_User: mysync
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 1694
Relay_Log_File: HE1-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000002
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: 1694
Relay_Log_Space: 525
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: 1250
Master_UUID: 82b160c7-9a8f-11e6-8412-000c29c6361d
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
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
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)

Part2: 传统复制模式切换为 GTID

①主库从库都需执行以下命令

mysql> set global gtid_mode=’OFF_PERMISSIVE’;
Query OK, 0 rows affected (0.01 sec)
mysql> set global gtid_mode=’ON_PERMISSIVE’;
Query OK, 0 rows affected (0.01 sec)
mysql> set global enforce_gtid_consistency=ON;
Query OK, 0 rows affected (0.00 sec)
mysql> set global gtid_mode=’ON’;
Query OK, 0 rows affected (0.00 sec)

②主库插数从库执行

可以看到 gtid_set 下面有数了，这说明已经开启了 gtid 模式

Part3:GTID 变更为传统模式