centos下MySQL主从同步配置

xiangxingchina

<div class="cnt">一、环境
        主机：
                    master操作系统：centos 5.3
                    IP：192.168.1.222
                    MySQL版本：5.0.77
          从机：          
      slave操作系统：centos 5.3
                     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                      |
+-----------------+------------+-------------------+-----------------------+
1 row in set (0.00 sec)
 
 
 
 
 
 
 
 
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
ERROR 1200 (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 (0.00 sec)，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
1 row in set (0.00 sec)
 
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, 0 rows affected (0.00 sec)
 
 
mysql> insert into test values(1,'zaq');
Query OK, 1 row affected (0.00 sec)
 
 
mysql> insert into test values(1,'xsw');
Query OK, 1 row affected (0.00 sec)
 
 
mysql> select * from test;
+------+------+
| id     | name |
+-------+------+
|     1     | zaq   |
|     1     | xsw |
+-------+------+
2 rows in set (0.00 sec)
 
 
 
 
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 |
+------+------+
2 rows in set (0.00 sec)
 
 
 
 
说明已经配置成功。