CentOS服务器环境下MySQL主从同步配置方法

本文实例讲述了CentOS服务器环境下MySQL主从同步配置方法。分享给大家供大家参考,具体如下:

一、环境

主机:

master操作系统:centos 5.3
IP:192.168.1.222
MySQL版本:5.0.77

从机:

slave操作系统:centos 5.3
IP:192.168.1.220
MySQL版本:5.0.77

二、创建数据库

分别登录master机和slave机的

  mysql:mysql Cu root Cp    

创建数据库:

  create database repl;    

三、master机和slave机的相关配置

1、修改master机器中mysql配置文件my.cnf,该文件在/etc目录下

在[mysqld]配置段添加如下字段

  server-id=1  log-bin=log  binlog-do-db=repl //需要同步的数据库,如果没有本行,即表示同步所有的数据库  binlog-ignore-db=mysql //被忽略的数据库    

在master机上为slave机添加一同步帐号

  grant replication slave on *.* to 'repl'@'192.1681.220' identified by '123456';    

重启master机的mysql服务:

  service mysqld restart    

show master status命令看日志情况

  mysql>show master status;  +-----------------+------------+-------------------+-----------------------+  | File    | Position  | Binlog_Do_DB | Binlog_Ignore_DB |  +-----------------+------------+-------------------+-----------------------+  | log.000003 |   98 | repl     | mysql     |  +-----------------+------------+-------------------+-----------------------+  1 row in set (0.00 sec)    

2、修改slave机中mysql配置文件

同样在[mysqld]字段下添加如下内容

  server-id=2  master-host=192.168.1.222  master-user=repl  master-password=123456  master-port=3306  master-connect-retry=60  replicate-do-db=repl //同步的数据库,不写本行表示同步所有数据库    

然后重启slave机的mysql

在slave机中进入mysql

  mysql>start slave;  mysql>show slave statusG;    

如果Slave_IO_Running、Slave_SQL_Running状态为Yes则表明设置成功。

四、出现的问题

当我在执行start slave这条命令时,系统提示

ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO,

执行show slave status;又提示Empty set (0.00 sec),想不通问题在哪里

后来发现,原来slave已经默认开启,要先关闭再开启

执行

  slave stop;    

再执行

代码如下:
change master to master_host='192.168.1.222',master_user='repl',master_password='123456', master_log_file='log.000003' ,master_log_pos=98;

然后执行

  slave start;    

这时再执行

  show slave statusG    

显示如下:

  *************************** 1. row ***************************     Slave_IO_State: Waiting for master to send event      Master_Host: 192.168.1.222      Master_User: repl      Master_Port: 3306      Connect_Retry: 60     Master_Log_File: log.000003    Read_Master_Log_Pos: 98     Relay_Log_File: mysqld-relay-bin.000002      Relay_Log_Pos: 229    Relay_Master_Log_File: log.000003  Slave_IO_Running: Yes     Slave_SQL_Running: Yes     Replicate_Do_DB:    Replicate_Ignore_DB:    Replicate_Do_Table:   Replicate_Ignore_Table:   Replicate_Wild_Do_Table:  Replicate_Wild_Ignore_Table:      Last_Errno: 0      Last_Error:      Skip_Counter: 0    Exec_Master_Log_Pos: 98     Relay_Log_Space: 229     Until_Condition: None     Until_Log_File:      Until_Log_Pos: 0    Master_SSL_Allowed: No    Master_SSL_CA_File:    Master_SSL_CA_Path:     Master_SSL_Cert:     Master_SSL_Cipher:     Master_SSL_Key:    Seconds_Behind_Master: 0  1 row in set (0.00 sec)    

至此,说明配置成功。

五、测试主从服务器是否能同步

在主服务器上面新建一个表,必须在repl数据下

  mysql> use repl  Database changed  mysql> create table test(id int,name char(10));  Query OK, 0 rows affected (0.00 sec)  mysql> insert into test values(1,'zaq');  Query OK, 1 row affected (0.00 sec)  mysql> insert into test values(1,'xsw');  Query OK, 1 row affected (0.00 sec)  mysql> select * from test;  +------+------+  | id | name |  +-------+------+  | 1 | zaq |  | 1 | xsw |  +-------+------+  2 rows in set (0.00 sec)    

在从服务器查看是否同步过来

  mysql> use repl;  Database changed  mysql> select * from test;  +------+------+  | id | name |  +------+------+  |  1 | zaq |  |  1 | xsw |  +------+------+  2 rows in set (0.00 sec)    

说明已经配置成功。

希望本文所述对大家CentOS服务器维护有所帮助。

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