MySQL建立双向主备复制server配置方法

1、环境描写叙述

　　serverA(主) 192.85.1.175

　　serverB(从) 192.85.1.176

　　Mysql版本号：5.1.61

       系统版本号：System OS：ubuntu 10.10 X86

（系统安装及数据环境搭建，省略）

2. 创建同步用户：

在服务B命令行运行 ：

      grant replication slave on *.* to 'replication'@'%' identified by 'mysqlsync';  
      flush privileges;  
      grant FILE,SELECT, replication slave on *.* to 'replication'@'192.85.1.175' identified by 'mysqlsync';  
      flush privileges;  

在serverA命令行运行：

      grant replication slave on *.* to 'replication'@'%' identified by 'mysqlsync';  
      flush privileges;  
      grant FILE,SELECT, replication slave on *.* to 'replication'@'192.85.1.176' identified by 'mysqlsync';  
      flush privileges;  

在A与Bserver上检查主备复制账号是否正常：

（1）分别在A与Bserver上的MYSQL命令行运行 “  show grants for ‘replication‘@‘%‘;”

假设输出结果类似于例如以下，表示正常，其它均为异常

mysql> show grants for 'replication'@'%';
+--------------------------------------------------------------------------------------------------------------------------------------+
| Grants for replication@%                                                                                                             |
+--------------------------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, FILE, REPLICATION SLAVE ON *.* TO 'replication'@'%' IDENTIFIED BY PASSWORD '*47E2485DF0DBED84B9BD90AF25F48A36E7EAD57E' |
+--------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

（2）使用主备复制账号在Aserver远程登录B ，在Bserver远程登录A ，測试 ，假设能够正常登录说明，账号正常，能够使用。

假设出现例如以下错误信息：

ERROR 2003 (HY000): Can't connect to MySQL server on '192.85.1.175' (111)
sxzichen@ubutun:/var/log/mysql$ ERROR 2003 (HY000): Can't connect to MySQL server on '192.85.1.175' (111) ERROR 2003 (HY000): Can't connect to MySQL server on '192.85.1.175' (111)

或

ERROR 2003 (HY000): Can't connect to MySQL server on '192.85.1.176' (111)
sxzichen@ubutun:/var/log/mysql$ ERROR 2003 (HY000): Can't connect to MySQL server on '192.85.1.176' (111) ERROR 2003 (HY000): Can't connect to MySQL server on '192.85.1.176' (111)

导致原因是，MYSQL数据库不同意远程訪问，须要分别改动A与Bserver 中数据库配置文件my.cnf  ，凝视掉 “   bind-address           = 127.0.0.1 ” 即为 “#bind-address           = 127.0.0.1”

分别又一次启动MYSQLserver ，測试正常 

3.配置数据主切换 之serverA ，改动其相应的数据配置文件----my.cnf ,在 [MYSQLD}加入例如以下行

#mysql replication  
server-id = 1 
log_bin = /var/log/mysql/mysql-bin.log  
master-host = 192.85.1.176  
master-user = replication 
master-password = mysqlsync 
master-port = 3306 
master-connect-retry = 60 
binlog-do-db = hrkip_zhhwd 
binlog-ignore-db = mysql   
binlog-ignore-db = information_schema 
binlog-ignore-db = phpmyadmin 
replicate-do-db = hrkip_zhhwd    
replicate-ignore-db = mysql,information_schema 

配置信息简介：

server-id               = 1    #主机标示，整数
log_bin                 = /var/log/mysql/mysql-bin.log   #确保此文件可写
binlog-do-db         =hrkip_zhhwd   #须要备份数据，多个写多行
binlog-ignore-db    =mysql #不须要备份的数据库，多个写多行

master-user = replication   #远程登录数据库username称
master-password = mysqlsync #远程登录数据库用户密码
master-port = 3306 #远程数据库server端口号，能够使用 show variables like ‘port‘; 命令查看，必要与目标数据库server端口号一致

4.配置数据主切换 之serverB ，改动其相应的数据配置文件----my.cnf ,在 [MYSQLD}加入例如以下行

#mysql replication  
server-id = 2 
log_bin = /var/log/mysql/mysql-bin.log  
master-host = 192.85.1.175  
master-user = replication 
master-password = mysqlsync 
master-port = 3306 
master-connect-retry = 60 
binlog-do-db = hrkip_zhhwd 
binlog-ignore-db = mysql 
binlog-ignore-db = information_schema 
binlog-ignore-db = phpmyadmin 
replicate-do-db = hrkip_zhhwd 
replicate-ignore-db = mysql,information_schema 

5.检查配置是否正常（l两台server上分别检查）：

启动 slave 服务 ，在MYSQL命令行运行

mysql> slave start ;                
Query OK, 0 rows affected, 1 warning (0.00 sec)

查看slave 状态 ，运行命令：

mysql> show slave status \G ;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.85.1.175
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 106
               Relay_Log_File: ubutun-relay-bin.000005
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: hrkip_zhhwd
          Replicate_Ignore_DB: mysql,information_schema
           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: 552
              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)

ERROR: 
No query specified

假设须要又一次启动slave server，首先 运行 slave stop  ,再运行 reset  slave , 删除  MYSQL 数据库相应的my.cnf 文件里log_bin文件夹（ /var/log/mysql/ ）下的"  mysql-bin."开头的全部文件，之后又一次启动MYSQL服务,之后再运行slave start 命令 。

6.进行測试，主备是否正常工作，slave 启动时，两个server上都启动，启动后不要任意关闭再重新启动，比如在serverA上启动后。

在serverA数据中插入

INSERT INTO ddgl_qdlx ( qdlxmc, lxjc, qdlxbz) VALUES
('175a', '75a', '175a');

在serverB中能够看到相应的记录 。

相同在serverB中插入 ：

INSERT INTO ddgl_qdlx (qdlx_id, qdlxmc, lxjc, qdlxbz) VALUES
(  '176b', '76b', '176b') ;

在serverA中能够看到相应的记录 。

測试OK 。