本文实例讲述了CentOS服务器环境下MySQL主从同步配置方法。分享给大家供大家参考,具体如下:
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
复制代码 代码如下: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)
至此,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。
希望本文所述对大家CentOS服务器维护有所帮助。