演示一下在MySQL下搭建多主一从的过程。

实验环境：

192.168.24.129:3306

192.168.24.129:3307

192.168.24.129:3308

主库操作

导出数据

分别在3306和3307上导出需要的数据库。

3306：

登录数据库：

[root@localhost 3306]# mysql -uroot -poldboy123 -S /tmp/mysql3306.sock

锁表：

mysql> flush tables with read lock;

状态点：

mysql> show master status;

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

| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000006 |      154 |              |                  |                   |

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

1 row in set (0.00 sec)

另开窗口开始导数据：

[root@localhost tmp]# mysqldump -uroot -poldboy123 -S /tmp/mysql3306.sock -F -R -x --master-data=2 -A --events|gzip >/tmp/dockerwy.sql.gz

在此查看状态点两个要保持一致，否则表没有锁住

mysql> show master status;

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

| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000007 |      154 |              |                  |                   |

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

1 row in set (0.00 sec)

解锁表：

mysql> unlock tables;

3307：

登录3307数据库：

[root@localhost 3307]# mysql -uroot -poldboy123 -S /tmp/mysql3307.sock

锁表：

mysql>flush tables with read lock;

查看状态点：

mysql> show master status;

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

| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000007 |      154 |              |                |                   |

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

1 row in set (0.00 sec)

另开窗口导数据：

[root@localhost 3307]# mysqldump -uroot -poldboy123 -S /tmp/mysql3307.sock -F -R -x --master-data=2 -A --events|gzip >/tmp/dockerwy_2.sql.gz

从新查看状态点：

mysql> show master status;

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

| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000008 |      154 |              |                  |                   |

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

1 row in set (0.00 sec)

解锁表：

mysql> unlock tables;

Query OK, 0 rows affected (0.00 sec)

建立授权账号

分别在3306和3307上面建立授权账号

3306：

mysql> grant replication slave on *.* to 'backup'@'192.168.24.129' identified by 'backup';

3307：

mysql> grant replication slave on *.* to 'backup'@'192.168.24.129' identified by 'backup';

从库操作

修改从库存储方式

修改3308的master-info和relay-info方式，从文件存储改为表存储。

编辑配置文件

[root@localhost 3308]# vim my.cnf

在[mysqld]模块下添加如下两行

master_info_repository=TABLE

relay_log_info_repository=TABLE

重启3308数据库：

[root@localhost 3308]# /data/3308/mysqld restart

重启之后我们可以登录数据库查看；

[root@localhost 3308]# mysql -uroot -poldboy123 -S /tmp/mysql3308.sock

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.7.16 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 variables like 'relay_log_info_repository';

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

| Variable_name             | Value |

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

| relay_log_info_repository | TABLE |

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

1 row in set (0.01 sec)

mysql> show variables like 'master_info_repository';

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

| Variable_name          | Value |

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

| master_info_repository | TABLE |

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

1 row in set (0.01 sec)

导入数据

导入3306的数据：

[root@localhost 3308]# gzip -d /tmp/dockerwy.sql.gz

[root@localhost 3308]# mysql -uroot -poldboy123 -S /tmp/mysql3308.sock < /tmp/dockerwy.sql.

导入3307的数据：

[root@localhost 3308]# gzip -d /tmp/dockerwy_2.sql.gz

[root@localhost 3308]# mysql -uroot -poldboy123 -S /tmp/mysql3308.sock < /tmp/dockerwy_2.sql

执行change master to

登录slave进行同步操作，分别change master两台服务器，后面以for channel ‘channel_name’区分

mysql> change master to master_host='192.168.24.129',master_user='backup',master_port=3306,master_password='backup',master_log_file='mysql-bin.000006',master_log_pos=154 for channel 'master_1';

Query OK, 0 rows affected, 2 warnings (0.07 sec)

mysql> change master to master_host='192.168.24.129',master_user='backup',master_port=3307,master_password='backup',master_log_file='mysql-bin.000007',master_log_pos=154 for channel 'master_2';

Query OK, 0 rows affected, 2 warnings (0.04 sec)

启动slave操作

可以通过start slave的方式去启动所有的复制，也可以通过单个复制源的方式，下面介绍单个复制的的启动演示

mysql> start slave for channel 'master_1';

Query OK, 0 rows affected (0.01 sec)

mysql> start slave for channel 'master_2';

Query OK, 0 rows affected (0.02 sec)

查看同步状态

正常启动后，可以查看同步的状态，执行show slave status for channel ‘channel_name\G’查看复制源master_1的同步状态；

mysql> show slave status for channel 'master_1'\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.24.129

Master_User: backup

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000008

Read_Master_Log_Pos: 154

Relay_Log_File: localhost-relay-bin-master_1.000006

Relay_Log_Pos: 367

Relay_Master_Log_File: mysql-bin.000008

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: 154

Relay_Log_Space: 634

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: 129

Master_UUID: df233252-afd5-11e6-8070-000c2962d708

Master_Info_File: mysql.slave_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_1

Master_TLS_Version:

1 row in set (0.00 sec)

查看master_2的同步状态

mysql> mysql> show slave status for channel 'master_2'\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.24.129

Master_User: backup

Master_Port: 3307

Connect_Retry: 60

Master_Log_File: mysql-bin.000008

Read_Master_Log_Pos: 154

Relay_Log_File: localhost-relay-bin-master_2.000004

Relay_Log_Pos: 367

Relay_Master_Log_File: mysql-bin.000008

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: 154

Relay_Log_Space: 634

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: 130

Master_UUID: 49bf20e1-afe2-11e6-aef5-000c2962d708

Master_Info_File: mysql.slave_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_2

Master_TLS_Version:

1 row in set (0.00 sec)