一)环境拓扑今天讨论的是mysql集群这一块，资源如下所示：二)Mysql安装配置这里不一一赘述，可以选择源代码编译安装，也可以参考我之前的一篇博文“懒人“速成

一)环境拓扑

二)Mysql安装配置

这里不一一赘述，可以选择源代码编译安装，也可以参考我之前的一篇博文“懒人“速成——linux LAMP环境。

三)节点配置

主节点：

1.首先在数据库中建立2个数据库和表：#service mysqld start

#mysql

mysql>create database www;

mysql>use www;

mysql>create table www(id int);

mysql>insert into www values(1);

mysql> select * from www;

查看数据： ；

同理创建blog数据库和表：mysql>create database blog;

mysql>use blog;

mysql>create table blog(id int);

mysql>insert into blog values(1);

mysql> select * from blog;

2.修改My.cnf配置文件vi etc/my.cnf[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

log-bin=mysql-bin

//日志为2进制，不需要更改

server-id =1

//为1就是Master,不需要更改

binlog-do-db=blog

//需要同步的库

binlog-do-db=www

//需要同步的库

binlog-ignore-db=mysql,test,information_schema //不需要记录日志的数据库名，多个数据库中间用逗号(,)隔开

innodb_data_home_dir = /usr/local/mysql/data/

//innodb的表空间位置

innodb_data_file_path = ibdata1:50M:autoextend

//表空间的名字，开始50M

innodb_log_group_home_dir = /usr/local/mysql/data/

innodb_buffer_pool_size = 256M

//为系统内存的50-80%

innodb_additional_mem_pool_size = 20M

innodb_log_file_size = 64M

innodb_log_buffer_size = 8M

innodb_flush_log_at_trx_commit = 1

innodb_lock_wait_timeout = 50

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

3.重启数据库[root@Test01 /]# service mysqld restart

Stopping mysqld: [ OK ]

Starting mysqld: [ OK ]

4.创建有权限的账号，让Slave数据库访问主数据库

[root@Test01 /]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.1.69-log Source distribution

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

mysql> grant replication slave on *.* to repl@"192.168.1.26" identified by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql>flush privileges;

;

5.备份Master数据库

mysql> flush tables with read lock; //不要退出这个终端，否则这个锁就不生效了。

同时取得快照，并记录日志和偏移量：

mysql> show master status;

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

| File

| Position | Binlog_Do_DB | Binlog_Ignore_DB

|

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

| mysql-bin.000001 |

196 | blog,www

| mysql,test,information_schema |

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

1 row in set (0.00 sec)

6.开启另一个终端，对主数据库做快照

[root@Test01 mysql]#cd /var/lib/mysql/

[root@Test01 mysql]#tar -zcvf backup.tar.gz www blog

7.库解锁

mysql> unlock tables;

从节点：

1.安装mysql，方法同上，不在赘述。

2.修改My.cnf配置文件

[root@Test02 mysql]# vi /etc/my.cnf

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

log-bin=mysql-bin

server-id = 2

#master-host

= 192.168.1.10

#master-user

= root

#master-password = 584911644

#master-port

= 3306

#master-log-pos = 196

#master-log-file = mysql-bin.000001

#master-connect-retry=60

replicate-do-db=www

//告诉slave只做www数据库的更新

replicate-do-db=blog

//告诉slave只做blog数据库的更新

log-slave-updates

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

"/etc/my.cnf" 23L, 551C

3.把之前主数据库压缩的数据拷贝到对应位置

我这里用的是SecureFX,当然，方法很多，免备案空间，也不细说了，可谓是条条大路通罗马。

4.启动数据库

[root@Test02 mysql]# service mysqld start

Starting mysqld: [ OK ]

5.配置，启动Slave

mysql> slave stop;

Query OK, 0 rows affected (0.00 sec)

mysql> change master to master_host='192.168.1.10',master_user='repl',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=196;

Query OK, 0 rows affected (0.04 sec)

mysql> slave start;

Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G;

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

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.1.10

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000001

Read_Master_Log_Pos: 339

Relay_Log_File: mysqld-relay-bin.000002

Relay_Log_Pos: 394

Relay_Master_Log_File: mysql-bin.000001

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Replicate_Do_DB: www,blog

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: 339

Relay_Log_Space: 550

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)

四)后期测试

主节点-数据增加：

mysql> insert into www values(2);

Query OK, 1 row affected (0.00 sec)

mysql> select * from www;

+------+

| id |

+------+

| 1 |

| 2 |

+------+

2 rows in set (0.00 sec)

从节点数据同步验证：

mysql> select * from www;

+------+

| id |

+------+

| 1 |

| 2 |

+------+

2 rows in set (0.00 sec)

主节点-数据删除：

mysql> delete from www where id ='2';

Query OK, 1 row affected (0.04 sec)

mysql> select * from www;

+------+

| id |

+------+

| 1 |

+------+

1 row in set (0.00 sec)

从节点数据同步验证：

mysql> select * from www;

+------+

| id |

+------+

| 1 |

+------+

1 row in set (0.00 sec)

综述：

Test02，从数据库上能做到同步数据库的更新操作，香港虚拟主机，目前是WWW和blog两张表。当然，这里只是抛砖引玉的作用，大家可以举一反三，根据自己实际需求，做出最好的环境搭建和配置。

最近在弄RHCS和keepalived，闲来有空就记录几笔数据库slave配置，方便大家学习和自己的积累。

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