linux centos下配置mysql主从同步的步骤

linux centos下配置mysql主从同步的步骤

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linux centos下配置mysql主从同步的步骤:

一、主机环境

主机:

master操作系统:centos5.3

IP:192.168.1.222

MySQL版本:5.0.77

从机:

slave操作系统:centos5.3

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

用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|

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

1row in set(0.00sec)

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

ERROR1200(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(0.00sec),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

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

1row in set(0.00sec)

显示红色那两行,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,0rows affected(0.00sec)

mysql>insert into test values(1,'zaq');

Query OK,1row affected(0.00sec)

mysql>insert into test values(1,'xsw');

Query OK,1row affected(0.00sec)

mysql>select*from test;

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

id|name|

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

1|zaq|

1|xsw|

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

2rows in set(0.00sec)

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|

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

2rows in set(0.00sec)

说明已经配置成功。