环境：

192.168.1.248 HE1 主库

192.168.1.249 HE2 主库

192.168.1.250 HE3 从库

主库授权备份账户

mysql>  grant SELECT,RELOAD,SHOW DATABASES,SUPER,LOCK TABLES,REPLICATION CLIENT,SHOW VIEW,EVENT,FILE on *.* to backup@'localhost' identified by 'MANAGER';
mysql> flush privileges;

建立主从复制的用户名和密码，指定哪个IP地址用户使用这个用户可以访问主库

mysql>  grant replication client,replication slave on *.* to 'mysync'@'192.168.1.%' identified by 'MANAGER';
mysql> flush privileges;

主库全库备份

[root@HE1 ~]# mysqldump -ubackup -p  --single-transaction --databases 248db --master-data=2 >248.sql

[root@HE2 ~]# mysqldump -ubackup -p  --single-transaction --databases 249db --master-data=2 >249.sql

拷贝主库备份文件到从库

[root@HE1 ~]# scp -rp 248.sql root@192.168.1.250:/root

[root@HE2 ~]# scp -rp 249.sql root@192.168.1.250:/root

从库还原

[root@HE3 ~]# mysql -uroot -p <248.sql

Enter password:

[root@HE3 ~]# mysql -uroot -p <249.sql

Enter password:

查看主库备份集中的binlog和position偏移量

[root@HE3 ~]# cat 248.sql |grep "CHANGE MASTER TO MASTER_LOG_FILE='"

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000017', MASTER_LOG_POS=581;

[root@HE3 ~]# cat 249.sql |grep "CHANGE MASTER TO MASTER_LOG_FILE='"

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000004', MASTER_LOG_POS=581;

从库：

在从库配置读取主库的IP地址，复制的用户名和密码，从主库哪个BINLOG文件开始读取，偏移量是多少

MariaDB [(none)]>CHANGE MASTER  'Master248' TO MASTER_HOST='192.168.1.248',MASTER_USER='mysync',MASTER_PASSWORD='MANAGER',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000017',MASTER_LOG_POS=581;

MariaDB [(none)]>CHANGE MASTER  'Master249' TO MASTER_HOST='192.168.1.249',MASTER_USER='mysync',MASTER_PASSWORD='MANAGER',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000004',MASTER_LOG_POS=581;

开启从库复制开关

MariaDB [(none)]> start slave 'Master248';MariaDB [(none)]> show slave 'Master248' status\GMariaDB [(none)]> start slave 'Master249';MariaDB [(none)]> show slave 'Master249' status\G

验证从库状态是否正常主要看下面这两个状态是否为yes

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| 248db              |
| 249db              |
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
6 rows in set (0.00 sec)

在248主机上创建表并插入数据

mysql> use 248db;
Database changed
mysql> create table aixuan1(-> id int(10) unsigned NOT NULL AUTO_INCREMENT,-> text varchar(20) NOT NULL DEFAULT '',-> PRIMARY KEY(id))-> ENGINE=innodb AUTO_INCREMENT=1-> DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.15 sec)mysql>
mysql> insert into aixuan1(text) values('aa'),('bb'),('cc'),('dd'),('ee'),('ff');
Query OK, 6 rows affected (0.02 sec)
Records: 6  Duplicates: 0  Warnings: 0

从库验证

MariaDB [(none)]> use 248db;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -ADatabase changed
MariaDB [248db]> show tables;
+-----------------+
| Tables_in_248db |
+-----------------+
| aixuan1         |
+-----------------+
1 row in set (0.00 sec)

在249主机上创建表并插入数据

mysql> use 249db;
Database changed
mysql> create table helei1(-> id int(10) unsigned NOT NULL AUTO_INCREMENT,-> text varchar(20) NOT NULL DEFAULT '',-> PRIMARY KEY(id))-> ENGINE=innodb AUTO_INCREMENT=1-> DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.15 sec)mysql>
mysql> insert into helei1(text) values('aaa'),('bbb'),('ccc'),('ddd'),('eee'),('fff');
Query OK, 6 rows affected (0.02 sec)
Records: 6  Duplicates: 0  Warnings: 0

从库验证

MariaDB [248db]> use 249db;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -ADatabase changed
MariaDB [249db]> show tables;
+-----------------+
| Tables_in_249db |
+-----------------+
| helei1          |
+-----------------+
1 row in set (0.00 sec)MariaDB [249db]> select * from helei1;
+----+------+
| id | text |
+----+------+
|  1 | aaa  |
|  2 | bbb  |
|  3 | ccc  |
|  4 | ddd  |
|  5 | eee  |
|  6 | fff  |
+----+------+
6 rows in set (0.00 sec)

至此，MariaDB多源复制搭建成功。

本文出自 “岁伏” 博客，请务必保留此出处http://suifu.blog.51cto.com/9167728/1830682