centos下MySQL主从同步配置(转)

转自http://hi.baidu.com/shenliling/blog/item/0aa441def7b4a20363279896.html

centos下MySQL主从同步配置

centos下MySQL主从同步配置
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。
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