MariaDB多源复制环境搭建（多主一丛）

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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

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)