mysql5.6.27主从从复制及切换

实验目的：M1->M2->S1级联复制结构更改为M1->S1->M2
M1:10.50.12.33
M2:10.50.12.34
S1:10.50.12.35
主从从级联环境搭建：
mysql安装略，需要注意的是要区别server-id，命名最好是ip尾号+端口号
以下操作默认mysql已经正常启动，但是还没有做主从级联复制
主从级联复制操作：
M1：
mysql> grant replication slave on *.* to 'repl'@'10.50.12.%' identified by 'slavepass';
mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000003
Position: 327
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
M2:
mysql> change master to master_host='10.50.12.33',master_user='repl',master_password='slavepass',master_port=3336,master_log_file='mysql-bin.000003',master_log_pos=327;
mysql> start slave;
mysql> show slave status\G
.....................................
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
.......................................
至此，M1到M2主从复制搭建完成，接下来做M2->S1主从复制
M2:
mysql> grant replication slave on *.* to 'repl'@'10.50.12.%' identified by 'slavepass';
mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000003
Position: 327
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
S1:
mysql> change master to master_host='10.50.12.34',master_user='repl',master_password='slavepass',master_port=3336,master_log_file='mysql-bin.000003',master_log_pos=327;
mysql> start slave;
mysql> show slave status\G
.....................................
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
.......................................
到现在为止，M1->M2->S1主从从级联复制环境已经搭建完毕，开始做切换
认为使复制报错，使M2和S1复制停止
M1：
create database gaoquan;
S1:
drop database gaoquan;
M2:
drop database gaoquan;
M1:
drop database gaoquan;
M2:
mysql> show slave status\G
Slave_IO_State: Waiting for master to send event
Master_Host: 10.50.12.33
Master_User: repl
Master_Port: 3336
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 521
Relay_Log_File: mysql-relay-bin.000002
Relay_Log_Pos: 386
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: No
mysql> stop slave;
S1:
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.50.12.34
Master_User: repl
Master_Port: 3336
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 521
Relay_Log_File: mysql-relay-bin.000002
Relay_Log_Pos: 386
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: No
mysql> stop slave;
到此时，从的复制已经停止，开始切换：
M1:
mysql> show master status\G;
*************************** 1. row ***************************
File: mysql-bin.000003
Position: 521
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
ERROR:
No query specified
S1:
mysql> change master to master_host='10.50.12.33',master_user='repl',master_password='slavepass',master_port=3336,master_log_file='mysql-bin.000003',master_log_pos=521;
mysql> start slave;
mysql> grant replication slave on *.* to 'repl'@'10.50.12.%' identified by 'slavepass';
Query OK, 0 rows affected (0.00 sec)
mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000003
Position: 521
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
M2：
mysql> change master to master_host='10.50.12.35',master_user='repl',master_password='slavepass',master_port=3336,master_log_file='mysql-bin.000003',master_log_pos=521;
mysql> start slave;
切换完成，此时使用show slave status\G在M2和S1上查看，发现复制状态已经正常，且级联关系已经变为M1->S1->M2