mysql主从同步配置

一、环境master：192.168.1.10slave: 192.168.1.11 二、主从数据库将主机上现有的数据库备份，然后在从机上建立同名数据库并还原。 三、master和 slave上的相关配置在/etc目录下可能无my.cnf文件，从/user/share/mysql目录中拷贝my-medium.cnf 到/etc并修改成my.cnf（master和slave上一样）。
如 # cp /user/share/mysql/my-medium.cnf /etc/my.cnf
1.修改master上的配置文件my.cnf。在[mysqld]下添加如下字段：server-id=1log-bin=logbinlog-do-db=database1 //需要同步的数据库binlog-do-db=database2binlog-ignore-db=mysql //被忽略的数据库 在master上位slave添加一个同步账号grant replication slave on *.* to 'backup'@'192.168.1.11' identified by 'password'; //在slave上登陆成功重启master的mysql服务：service mysql restart; 用show master status命令查看日志情况mysql> show master status\G; *************************** 1. row ***************************File: log.000027Position: 3151Binlog_Do_DB: database1,database2Binlog_Ignore_DB:1 row in set (0.00 sec) 2.修改slave上的配置文件my.cnf。在[mysqld]下添加如下字段：server-id=2master-host=192.168.1.10master-user= backupmaster-password= passwordmaster-port=3306master-connect-retry=60replicate-do-db=database1 //同步的数据库replicate-do-db=database2replicate-ignore-db=mysql //被忽略的数据库 重启slave的mysql服务：service mysql restart; 在进入slave机中的mysql。mysql>start slave;mysql>show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.124.51 Master_User: AffairLog Master_Port: 3306 Connect_Retry: 60 Master_Log_File: log.000027 Read_Master_Log_Pos: 3151 Relay_Log_File: localhost-relay-bin.000379 Relay_Log_Pos: 245 Relay_Master_Log_File: log.000027 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: database1,database2 Replicate_Ignore_DB: mysql 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: 3151 Relay_Log_Space: 543 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: 0Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error:1 row in set (0.00 sec) 如果Slave_IO_Running、Slave_SQL_Running状态为Yes则表明设置成功。 四、出现问题Slave_IO_Running: No或者Slave_SQL_Running: No1.停掉slave服务mysql> slave stop;Query OK, 0 rows affected (2.01 sec) 2.解决办法解决办法1a.在master上查看。mysql> show master status\G;*************************** 1. row ***************************File: log.000027Position: 3151Binlog_Do_DB: database1,database2Binlog_Ignore_DB:1 row in set (0.00 sec) b.到slave上手动同步。mysql>change master to
>master_host='192.168.1.10',
>master_user='backup',
>master_password='password',
>master_log_file='log.000027',
>master_log_pos=3151;
Query OK, 0 rows affected (0.00 sec) 解决方法2mysql> slave stop;mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1;mysql> slave start; 3．启动slave服务mysql> slave start; 4．再次查看Slave_IO_Running、Slave_SQL_Running状态，为Yes则表明设置成功。 PS：Slave_IO_Running：连接到主库，并读取主库的日志到本地，生成本地日志文件Slave_SQL_Running:读取本地日志文件，并执行日志里的SQL命令。