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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 –u root –p

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 status\G;

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
复制代码 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 status\G

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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