一、环境

192.168.1.1  MysqlA

192.168.1.2    MysqlB


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

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GRANT all privileges ON *.* TO [email protected] IDENTIFIED BY '123456' ;
flush privileges ;

MysqlB

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GRANT all privileges ON *.* TO [email protected] IDENTIFIED BY '123456' ;
flush privileges ;


2)配置主配置文件


在MysqlA上

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[mysqld]
server- id = 1
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
#忽略mysql数据库的同步
replicate-ignore-db=mysql
#replicate-ignore-db=test


在MysqlB上

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[mysqld]
server- id = 2
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
#忽略mysql数据库的同步
replicate-ignore-db=mysql
#replicate-ignore-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

/etc/init.d/mysql restart


3)同步两台数据库


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.000001 |   107|              |                  |

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

      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.000001 |    107 |              |                  |

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

      1 row in set (0.00 sec)


##在 MysqlA 上

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#stop slave;
CHANGE MASTER TO master_host= '192.168.1.2' , master_user= 'root' , master_password= '123456' , MASTER_LOG_FILE= 'mysql-bin.000001' , MASTER_LOG_POS=107;
start slave;

##在 MysqlB 上

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stop slave;
CHANGE MASTER TO master_host= '192.168.1.1' , master_user= 'root' , master_password= '123456' , MASTER_LOG_FILE= 'mysql-bin.000001' , MASTER_LOG_POS=107;
start slave;


##分别查看两台数据库的slave状态。


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mysql> show slave status\G;


结果:

Slave_IO_Running: Yes

Slave_SQL_Running: Yes


都为yes就说明已经配置成功了


4)验证mysql主主

在MysqlA的mysqldb数据库中

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create database test;
create table test ( name varchar (15) not null ,city varchar (15) not null ,birth date not null );


在MysqlB的mysqldb数据库中能够查看到该表

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mysql> show tables;

  +----------------+

  | Tables_in_test |

  +----------------+

  | test           |

  +----------------+

  1 row in set (0.00 sec)


在MysqlB中向表test插入数据

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insert into test values ( "aa" , "bb" , "2012-05-16" );
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mysql> select * from test;

  +------+----------+------------+

  | name | city     | birth      |

  +------+----------+------------+

  | aa   | bb       | 2012-05-16 |

  +------+----------+------------+

  1 row in set (0.00 sec)


到此验证完毕.