主从复制是mysql数据库热备份的一个常用的做法,这样可以保存数据库任何一方出现问题可及时更换上,下面小编来分享一篇关于从线上环境配置主从的mysql主从复制安装配置实例.
主机172.16.0.21,172.16.0.22,centos6.2,分别使用yum安装mysql
给21上的mysql新建库:
CREATE DATABASE `replytest1` /*!40100 DEFAULT CHARACTER SET utf8 */;
建表:
- CREATETABLE`replytest1`.`test1`(
- `id`INTUNSIGNEDNOTNULLAUTO_INCREMENT,
- `test1col`VARCHAR(45)NULL,
- PRIMARYKEY(`id`));
插入数据:
- INSERTINTO`replytest1`.`test1`(`test1col`)VALUES(’1′);
- INSERTINTO`replytest1`.`test1`(`test1col`)VALUES(’2′);
修改主库配置文件:
server-id = 1 //数据库ID号,为1时表示为Master,其中master_id必须为1到232–1之间的一个正整数值;
log-bin=mysql-bin //启用二进制日志;
binlog-do-db=data //需要同步的二进制数据库名;可以写多行
binlog-ignore-db=mysql //不同步的二进制数据库名;这个同步后听说很麻烦
log-slave-updates //把更新的记录写到二进制文件中;
slave-skip-errors
创建负责复制的用户:
- ###GRANTALLPRIVILEGESON*.*TOreply@172.16.0.1IDENTIFIEDBY‘reply’WITHGRANTOPTION;
- grantreplicationslaveon*.*totest@192.168.2.119identifiedby‘********’
- flushprivileges;
锁定主库:FLUSH TABLES WITH READ LOCK;
导出主表数据:解锁并检查当前的master状态及复制到哪里.
UNLOCK TABLES;Show master status;
从库设置,修改配置文件,代码如下:
- #从库设置
- server-id=2
- master-host=172.16.0.1
- master-user=reply
- master-password=reply
- master-connect-retry=600#如果发现主服务器断线,重新连接的时间差;
- replicate-ignore-db=mysql
- replicate-ignore-db=test
- log-slave-update
- slave-skip-errors
- #从库设置结束
重启mysql,在从服务器上执行stop slave,reset master命令,重置成主数据库,代码如下:
- mysql>stopslave;
- QueryOK,0rowsaffected,1warning(0.00sec)
- mysql>resetmaster;
- changemastertomaster_host=’172.16.0.21′,master_user=’reply’,master_password=’reply’,master_log_file=’mysql-bin.000001′,master_log_pos=106;
- Slavestart;
- mysql>showslavestatusG
- ***************************1.row***************************
- Slave_IO_State:Waitingformastertosendevent
- Master_Host:172.16.0.21
- Master_User:reply
- Master_Port:3306
- Connect_Retry:600
- Master_Log_File:mysql-bin.000001
- Read_Master_Log_Pos:106
- Relay_Log_File:mysqld-relay-bin.000002
- Relay_Log_Pos:251
- Relay_Master_Log_File:mysql-bin.000001
- Slave_IO_Running:Yes--phpfensi.com
- Slave_SQL_Running:Yes
- Replicate_Do_DB:
- Replicate_Ignore_DB:mysql,test
- 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:407
- 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:
- 1rowinset(0.00sec)