Mysql主从数据库配置

 

环境:

主服务器:centos 5.2 mysql 5.1.35 源码 IP:192.168.1.22

从服务器:centos 5.2 mysql 5.1.35 源码 IP:192.168.1.33

配置:

一、主服务器

1.1、创建一个复制用户，具有replication slave 权限。

mysql>grant replication slave on *.* to ‘repl’@’192.168.1.22′ identified by ‘repl’;

1.2、编辑my.cnf文件

vi /etc/my.cnf

添加

server-id=1

并开启log-bin二进制日志文件

log-bin=mysql-bin

注:需要把默认的server-id=1去掉

1.3、启动mysql数据库

mysqld_safe –user=mysql &

1.4、设置读锁

mysql>flush tables with read lock;

1.5、得到binlog日志文件名和偏移量

mysql>show master status;

+——————+———-+————–+——————+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |

+——————+———-+————–+——————+

 

| mysql-bin.0000010 | 106| | |

+——————+———-+————–+——————+

1.6、备份要同步的数据库

mysqldump test > test.sql

1.7、解锁

mysql>unlock tables;

二、从服务器

2.1、编辑my.cnf文件

vi /etc/my.cnf

添加

server-id=2

注:需要把默认的server-id=1去掉

2.2、启动从数据库

mysqld_safe –user=mysql &

2.3、对从数据库进行相应设置

mysql> change master to

-> master_host=’192.168.1.22′

-> master_user=’repl’

-> master_password=’repl’

-> master_log_file=’mysql-bin.0000010′

-> master_log_pos=106;

2.4、启动从服务器slave线程

mysql>start slave;

执行show processlist命令显示以下进程:

mysql>show processlist\G

*************************** 2. row ***************************

Id: 2

User: system user

Host:

db: NULL

Command: Connect

Time: 2579

State: Has read all relay log; waiting for the slave I/O thread to update it

Info: NULL表示slave已经连接上master，开始接受并执行日志

2.5、查看slave线程状态

mysql>show slave status;

 

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.1.22

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.0000010

Read_Master_Log_Pos: 106

Relay_Log_File: centos-relay-bin.000002

Relay_Log_Pos: 529

Relay_Master_Log_File: mysql-bin.0000010

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: 106

Relay_Log_Space: 830

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

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 0

Last_IO_Error:

 

Skip_Counter: 0

Exec_Master_Log_Pos: 106

Relay_Log_Space: 830

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

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 0

Last_IO_Error:

Last_SQL_Errno: 0

Last_SQL_Error:

1 row in set (0.00 sec)

验证是否配置正确

在从服务器上执行

show slave status\G;

Waiting for master to send event

Waiting for master to send event

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

如以上二行同时为Yes 说明配置成功

测试

1、在主服务器test数据库中创建user表

mysql>use test;

mysql>create table user(id int);

2、在从服务器中查看user表

mysql>use test;

mysql> show tables like ‘user’;

+———————-+

| Tables_in_test(user) |

+———————-+

| user |

+———————-+

1 row in set (0.00 sec)

说明主从数据同步成功