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两主机搭建MySQL主从复制后,show slave status显示:Last_IO_Error: error connecting to master ……解决

 

两台主机A、B搭建mysql主从复制关系(A为master,B为slave)后,在slave上执行show slave status,结果中显示Last_IO_Error: error connecting to master 'replication@VMS00782:3306'……

 

首先查看B的错误日志文件,发现如下错误:

 

ERROR] Slave I/O: error connecting to master 'replication@VMS00782:3306' - retry-time: 60  retries: 2, Error_code: 1045

 

接着用perror查看上一部获得的错误代码:

 

perror 1045

 

输出:

MySQL error code 1045 (ER_ACCESS_DENIED_ERROR): Access denied for user '%-.48s'@'%-.64s' (using password: %s)

 

 

难道是复制用的账户存在问题??先在A上确认复制用户账户是否存在且是否赋了正确的权限

 

 mysql> show grants for 'usvr_replication'@'%';+-----------------------------------------------------------------------------------------------------------------------------+| Grants for usvr_replication@%                                                                                               |+-----------------------------------------------------------------------------------------------------------------------------+| GRANT REPLICATION SLAVE ON *.* TO 'usvr_replication'@'%' IDENTIFIED BY PASSWORD '*F4039654D0AFD80BB0A7775938EFD47ACB809529' |+-----------------------------------------------------------------------------------------------------------------------------+1 row in set (0.00 sec)

 

 

发现没有问题!

 

然后,试着从B使用该账户连接至A:

 

mysql -uusvr_replication -h 192.168.83.35 -p -P55944

 

 

输入设置的密码后回车,没连上!!!再次输入,还没连上!!!

 

看来问题出在这儿了,仔细检查,原来是密码记错了!

 

试着用正确的密码重建复制关系:

 

在B上执行:

 

mysql>stop slave;mysql>researt slave;mysql>change master to master_host = 'VMS00782',master_user = 'replication',master_password = 'ReplPass@123456',master_port = 3306,master_log_file = 'VMS00782-bin.000001',master_log_pos = 120;mysql>start slave;mysql>show slave status;

 

 

一切正常!!!

 

需要注意的几个问题:

 

要在change master to语句的master_password部分使用原始的密码而非散列过的密码。

 

注意在第一时间查看错误日志文件,可使用perror工具根据错误代码查看具体的错误。

 

另外几个常见问题:

 

mysql无法启动:先看错误日志文件中提示的错误,依据错误找原因;查看配置文件中数据目录等配置是否正确;检查MySQL相关目录属主和属组是否正确;查看是否有之前未被正确关闭的mysqld进程仍在运行。

 

mysql无法连接:先看mysqld进程是否正确启动了;再看提供的连接串是否争取无误。

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