mysql主从复制
时间:2013-12-01 02:12:00 作者:beebol 标签: master mysql replication slave 分类: Mysql
环境说明：
一台master：
IP地址：192.168.0.105 mysql版本：5.5.15
一台slave：
IP地址：192.168.0.104 mysql版本：5.5.15
首先来配置master，修改/etc/my.cnf文件，在[mysqld]下增加如下内容：
log-bin=mysql-bin #开启二进制日志，这个是必须的，mysql主从复制就是基于二进制日志的 server-id = 1#主从必须有一个唯一的server-id #主从必须有一个唯一的server-id
master配置很简单，配置好后重启mysql，给复制添加专门的用户。
mysql> GRANT REPLICATION SLAVE,REPLICATION CLIENT on *.* to beebol@'192.168.0.104' identified by '123456'; Query OK, 0 rows affected (0.01 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> SHOW GRANTS FOR beebol@'192.168.0.104'; +---------------------------------------------------------------------------------------------------------------------------------------------------+ | Grants for beebol@192.168.0.104 | +---------------------------------------------------------------------------------------------------------------------------------------------------+ | GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'beebol'@'192.168.0.104' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' | +---------------------------------------------------------------------------------------------------------------------------------------------------+1 row in set (0.01 sec) 1 row in set (0.01 sec)
只要给从mysql replication slave和replication client就可以了。
然后来配置slave端，修改/etc/my.cnf
#log-bin=mysql-bin #在从上就不需要开启二进制日志了 relay-log=relay-bin relay-log-index=relay-bin.index #开启中继日志 # binary logging format - mixed recommended binlog_format=mixed # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id = 11 #这个server-id很关键，不能与上面的主server-id一致就行 replicate-do-db=beebolblog#只复制beebolblog库 #只复制beebolblog库
再将master中的beebolblog数据库备份导出来，导入到从库
mysqldump -f --single-transaction -R -q --master-data=1 -B beebolblog >beebolblog.sql [root@localhost ~]# scp beebolblog.sql 192.168.0.104:/tmpbeebolblog.sql 100% 2336KB 2.3MB/s 00:00 beebolblog.sql 100% 2336KB 2.3MB/s 00:00
把master备份库beebolblog数据库导入到slave中：
[root@server1 tmp]# mysql <beebolblog.sql
[root@server1 tmp]# grep 'CHANGE MASTER' beebolblog.sql
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000015', MASTER_LOG_POS=107;
#导入后，再看看从服务器应该从那个二进制日志开始，什么位置开始。显示这个change master信息中在导出数据时添加了--master-data
#在slave端进行配置连接信息
mysql> CHANGE MASTER TO MASTER_HOST='192.168.0.105',MASTER_USER='beebol',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql-bin.000015',MASTER_LOG_POS=107;
Query OK, 0 rows affected (0.08 sec)
#配置好后，可以启动slave
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
#查看状态
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.105
Master_User: beebol
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000015
Read_Master_Log_Pos: 355
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 501
Relay_Master_Log_File: mysql-bin.000015
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: beebolblog
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: 355
Relay_Log_Space: 651
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:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
ERROR: No query specified
No query specified
查看状态显示两个线程正常：Slave_IO_Running: Yes，Slave_SQL_Running: Yes，这表示一切正常。
Slave_IO_Running:IO线程负责接收master传过来的二进制日志，放入中继日志当中
Slave_SQL_Running: SQL线程负责将中继日志的sql语句执行一遍
如上操作就可以实现mysql的主从复制功能了。