MYSQLmaster,slave环境的搭建
试验环境:
Linux5.5(32bit)
撰写人:hx10
日期:2010/7/3  hangzhou
Blog:http://hi.baidu.com/hx10
试验环境:
Master:10.80.11.203
Slave1:10.80.11.204
Slave2:10.80.11.205
 
安装mysql
 
cd /usr/local
tar -zxvf mysql-5.1.48-linux-i686-glibc23.tar.gz
mv mysql-5.1.48-linux-i686-glibc23  mysql
groupadd mysql
useradd -g mysql mysql
cd /usr/local/mysql
chown -R root /usr/local/mysql
chgrp -R mysql /usr/local/mysql
chown -R mysql /usr/local/mysql/data
scripts/mysql_install_db --user=mysql
chown -R root .
chown -R mysql data
chgrp -R mysql .
cp /usr/local/mysql/support-files/my-large.cnf /etc/my.cnf
cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
 
增加环境变量
echo "export PATH=$PATH:/usr/local/mysql/bin" >>/etc/profile
source /etc/profile
 
主节点:     
首先在master上建立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;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.01 sec)
 
 
mysql>create database blog;
mysql>use blog;
mysql>create table blog(id int);
mysql>insert into blog values(1);
mysql> select * from blog;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)
 
 
1.vim /etc/my.cnf
注意一下2个参数,这一段在[mysqld]节点中添加
log-bin=mysql-bin       //日志为2进制,不需要更改
server-id    =1         //1就是Master,不需要更改
binlog-do-db=blog        //要同步的库
binlog-do-db=www         //要同步的库
binlog-ignore-db=mysql,test,information_schema   //是不要记录日志的数据库名,多个数据库中间用逗号(,)隔开
 
 
然后把innodb前面的#去掉,结果如下
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
 
 
 
然后启动数据库,让配置文件生效
#service mysqld restart
 
2.master服务器添加要从slave服务器访问master服务器的有权限的帐号
 
#mysql -u root -p
mysql>grant replication slave on *.* to repluser@'10.80.11.204' identified by '123456';
mysql>grant replication slave on *.* to repluser@'10.80.11.205' identified by '123456';
mysql>flush privileges;
 
 
格式:GRANT REPLICATION SLAVE ON *.* TO '帐号'@'从服务器IP或主机名' IDENTIFIED BY '密码';
 
3.备份master数据库数据
mysql> flush tables with read lock;  //不要退出这个终端,否则这个锁就不生效了。从服务器的数据库建好后。在主服务器执行解锁
 
同时要记录下mysql-bin.0000031271
mysql> show master status;
+------------------+----------+--------------+-------------------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB              |
+------------------+----------+--------------+-------------------------------+
| mysql-bin.000002 |      106 | blog,www     | mysql,test,information_schema |
+------------------+----------+--------------+-------------------------------+
1 row in set (0.01 sec)
取得快照并记录日志名和偏移量
 
开启另一个终端对主服务器数据目录做快照。
#cd /usr/local/mysql/data
#tar -zcvf backup.tar.gz www blog
 
此时在主库解开table的锁定
mysql> unlock tables;
 
 
从节点:
 
安装mysql方法同主节点
1. vim /etc/my.cnf   增加以下几项
server-id  = 2
master-host     =   10.80.11.203
master-user     =   repluser
master-password =   123456
master-port     =  3306
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
 
3.把从主数据库服务器备份出来的数据库导入到从服务器中
先用scp把主服务器上的backup.tar.gz拷贝过来,解压到/usr/local/mysql/data目录
#cd /usr/local/mysq/data
#tar -zxvf backup.tar.gz
 
 
 
启动从库服务器
#service mysqld start
停止slave服务,设置主服务器的各种参数
#mysql
mysql>slave stop;
然后敲入以下代码,一行一行的复制
change master to
MASTER_HOST='10.80.11.203',
MASTER_USER='repluser',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000002',
MASTER_LOG_POS=106;
mysql> slave start;
 
然后在master上插入记录,会发现在slave上也会出现
 
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.80.11.203
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 1271
               Relay_Log_File: squid2-relay-bin.000004
                Relay_Log_Pos: 617
        Relay_Master_Log_File: mysql-bin.000003
             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: 1271
              Relay_Log_Space: 773
              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 (0.01 sec)
 
从节点2的配置跟从节点1的配置一样,只是server-id  改成3
 
 
最重要是以下三点:
 
Slave_IO_Running
是否要从 Master Server 复製 Binary Log 资料,必须为 Yes
 
Slave_SQL_Running
是否要执行从 Master Server 复製过来的 Binary Log 资料,必须为 Yes
 
Seconds_Behind_Master
Slave 的资料落后了 Master 多少秒,执行一段时间后应该会是零。
然后在master上更新数据,会发现在2slave上都能查询到数据,本实验测试成功。