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\G
MariaDB [(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 -A
Database 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 -A
Database 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。