mysql主从环境Auto_Position=1下的主备切换

环境:
OS:Centos 7
mysql:5.7.29

1.停止从服务器slave服务：
mysql> stop slave;

2.将从服务器切换为主服务器,在从服务器上执行
mysql> reset master;
mysql> reset slave all;

3.这个时候查看下新主库的gtid

mysql> show slave status \G;
Empty set (0.00 sec)

ERROR: 
No query specified

mysql> show master status \G;
*************************** 1. row ***************************
             File: binlog.000001
         Position: 154
     Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 
1 row in set (0.00 sec)

ERROR: 
No query specified

4.设置新主库可写(原来只读)
set global read_only=off;

5.新主库模拟写入数据
mysql> use db_test;
insert into tb_test values(14,'name14'),(15,'name15'),(16,'name16');

insert into tb_test values(17,'name17'),(18,'name18'),(19,'name19');

这个时候的事务情况:

mysql> show master status \G;
*************************** 1. row ***************************
             File: binlog.000001
         Position: 452
     Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 823a206f-3502-11ee-8c3a-52540051cd25:1
1 row in set (0.00 sec)

ERROR: 
No query specified

5.启动原来的主库，使其变成从库

/data/middle/mysql57/bin/mysqld_safe --defaults-file=/data/middle/mysql57/conf/my.cnf --user=mysql &
/data/middle/mysql57/bin/mysql -h localhost -uroot -P13306 -pmysql

change master to master_host='192.168.1.134',
       master_user='ureplsync',
       master_password='my6sq#7Rte',
       master_port=13306,
       master_auto_position=1;

start slave;

6.这个时候在从库下验证新主库新写入的数据是否同步过来