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《高可用MySQL》 — 主从复制_MySQL

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2016-06-01 13:38:47958browse

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《高可用MySQL》P10

MySQL主从复制

 

MySQL的复制在以下环境中经常使用:

1 通过热备份来避免灾难

2 产生报表

使用从服务器来产生报表,可大大降低主服务器的负载。

3 调试和审计

例如,查看某些查询是否有性能问题,以及服务器是否由于某个槽糕的查询而不同步。

 

MySQL复制的基本步骤

1 配置一个服务器作为 Master。

2 配置一个服务器作为 Slave。

3 将 Slave 连接到 Master。

除非你从一开始就计划复制且 my.conf 文件中配置正确,否则步骤1和步骤2要求必须重启每个服务器。

 

配置Master

将配置选项添加到my.conf以配置Master

[mysqld]user          = mysqlpid-file      = /var/run/mysqld/mysqld.pidsocket        = /var/run/mysqld/mysqld.sockport          = 3306basedir       = /usrdatadir       = /var/lib/mysqltmpdir        = /tmp<strong>log</strong><strong>-bin       = master-binlog-bin-index = master-bin.indexserver-id     = 1</strong>

 在Master上创建一个复制用户

master> CREATE USER repl_user;Query OK, 0 rows affected (0.00 sec)master> GRANT REPLICATION SLAVE on *.* to repl_user IDENTIFIED by 'xyzzy';Query OK, 0 rows affected (0.00 sec)

 

配置Slave

添加选项到my.conf文件来配置Slave

[mysqld]user                = mysqlpid-file            = /var/run/mysqld/mysqld.pidsocket              = /var/run/mysqld/mysqld.sockport                =  3306basedir             =  /usrdatadir             =  /var/lib/mysqltmpdir              =  /tmp<strong>server</strong><strong>-id           = 2relay-log-index     = slave-relay-bin.indexrelay-log           = slave-relay-bin</strong>

 

连接Master和Slave

  slave>  CHANGE MASTER TO      ->     MASTER_HOST  ="master-1",      ->     MASTER_PORT = 3306,      ->     MCSTER_USER = 'repl_user',      ->     MAST_PASSWORD = 'xyzzy';  Query OK, 0 rows affected(0.00 sec)  slave> START SLAVE;

 

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