Mysql主主同步配置

Mysql主主同步配置

一、环境
172.16.0.153  MysqlA5.0
172.16.0.154    MysqlB5.0
二，安装配置
1.安装mysql省略，MysqlA和MysqlB版本保持一致就可以了！
2.配置mysql
1）在两台机器上给对方授权
MysqlA
GRANT REPLICATION SLAVE,RELOAD,SUPER ON *.* TO IDENTIFIED BY 'tongbu_123';
flush privileges;
MysqlB
GRANT REPLICATION SLAVE,RELOAD,SUPER ON *.* TO IDENTIFIED BY 'tongbu_123';
flush privileges;
2）配置主配置文件
在MysqlA上
[mysqld]
server-id = 10
log-bin = mysql-bin
log-slave-updates
auto-increment-increment = 2
auto-increment-offset = 1
#要同步的库名
replicate-do-db = test
在MysqlB上
[mysqld]
server-id = 20
log-bin = mysql-bin
log-slave-updates
auto-increment-increment = 2
auto-increment-offset = 2
#要同步的库名
replicate-do-db = test
注：二库都只有server-id不同和auto-increment-offset不同:
    auto-increment-offset是用来设定数据库中自动增长的起点的，回为这两能服务器都设定了一次自动增长值2，所以它们的起点必须得不同，这样才能避免两台服务器数据同步时出现主键冲突
    replicate-do-db 指定同步的数据库，我们只在两台服务器间同步test数据库
另：auto-increment-increment的值应设为整个结构中服务器的总数，本案例用到两台服务器，所以值设为2
配置完成后，重启两台数据库
service mysqld restart
3）同步两台数据库
首先先在两台数据库上创建要同步的数据库
create database test;
分别在两台数据库中，执行下命令，查看potion，以及binlog。
MysqlA上面执行
mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 |      491 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
MysqlB上面执行
mysql> show master status;

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 |      335 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

##在 MysqlA 上
stop slave;
CHANGE MASTER TO master_host='172.16.0.154', master_user='tongbu', master_password='tongbu_123', MASTER_LOG_FILE='mysql-bin.000006', MASTER_LOG_POS=199850134;
start slave;
##在 MysqlB 上
stop slave;
CHANGE MASTER TO master_host='172.16.0.153', master_user='tongbu', master_password='tongbu_123', MASTER_LOG_FILE='mysql-bin.000006', MASTER_LOG_POS=8372;
start slave;
##分别查看两台数据库的slave状态。
mysql> show slave status\G;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
##都为yes就ok了
4）验证mysql主主
###好了现在我们来验证吧
在MysqlA的mysqldb数据库中创建表
create table t11_replicas
(id int not null auto_increment primary key,
   str varchar(255) not null) engine myisam;
在MysqlB的mysqldb数据库中能够查看到该表
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t11_replicas   |
+----------------+
1 row in set (0.00 sec)
在MysqlB中向表test插入数据
 insert into t11_replicas(str) values
  ('This is a master to master test table');
在MysqlA中查看表test
select * from t11_replicas;
mysql> select * from t11_replicas;
+----+---------------------------------------+
| id | str                                   |
+----+---------------------------------------+
|  1 | This is a master to master test table |
+----+---------------------------------------+
1 row in set (0.00 sec)