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MySQL Replication 配置

Jun 07, 2016 pm 04:33 PM
mysqlreplicationConfiguration

mysql replication 主要通过复制二进制日志,在slave上执行master一样的来SQL来保持master 和slave的数据一致。 好处不必多说, 第一个 master-slave的结构首先能实现读写分离, 对于缓解数据库Server的鸭梨会起到一定好处, 另外当master宕机的话, 可以马

    mysql replication 主要通过复制二进制日志,在slave上执行master一样的来SQL来保持master 和slave的数据一致。

    好处不必多说, 第一个 master-slave的结构首先能实现读写分离, 对于缓解数据库Server的鸭梨会起到一定好处, 另外当master宕机的话, 可以马上切到slave上边,可以提高系统的可用性。

1. mysql 的主从复制是通过 bin log来实现的, 首先master要开启二进制日志

    server-id = 1

    log_bin = /var/log/mysql/mysql-bin.log

    binlog_ignore_db = mysql

2. master 上要开一个专供复制的账号

    grant file,select,replication slave on *.* to slave@'%' identified by '123456'; --我这里是有问题的,开了权限给所有的库 所有的机器,而且还设置了弱密码,不过做为测试机玩玩也未必不可

3. slave 机器 设置一个 server-id

    server-id = 2

4. 设置复制信息

    这里要先看一下当前 master 的binlog 记到哪里了, 从哪个文件开始的哪一个位置, 然后设置slave从这个地方开始复制。 所以这个时候要保证 master 和 slave的数据是一样的,这样才能保证master和slave数据的一致性。 

    先在master端执行 : show master status;

    mysql> show master status; 

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

    | File                    | Position    | Binlog_Do_DB | Binlog_Ignore_DB |

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

    | mysql-bin.000015 | 26560211 |                    | mysql                 |

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

1 row in set (0.00 sec)

得到当前的二进制日志文件和当前的位置

在 slave 端执行:

    change master to master_host='192.168.57.64',

        master_user='slave',

        master_password='123456',

        master_log_file='mysql-bin.000015',

        master_log_pos=26560211;

    最后 slave端 start slave;

用 show slave status\G; 查看参数 Slave_IO_Running 和 Slave_SQL_Running, 如果两个参数都是 yes , 说明搞定。

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