MySQL的远程连接出现错误提示分析_MySQL
技巧问题 Mysql的远程连接出现"Lost connection to MySQL server during query" 安装完了RH 8.0用自带的mysql以后直接在本机上可以正常使用mysql登陆,用
mysql -u root -p
添加了一些用户,如* beginner pass
即beginner可以从任何地方通过密码可以访问这台Mysql服务器(假设我的mysql服务器为mysql.test.com)但当我运行
mysql -h mysql.test.com -u beginner -p
就提示:
ERROR 2013: Lost connection to MySQL server during query
其实我只要输入
mysql -h mysql.test.com时就出现上面的提示,也就是说它根本还没有到验证密码那一步。
这个问题是由于glibc的一个bug造成的。
在glibc某些版本中,gethostbyaddr函数(确切地说是_nss_dns_gethostbyaddr_r)存在缓冲区溢出问题,在处理大数据时会造成SEGMENT FAULT。
在处理远程连接时,mysqld会调用ip_to_hostname()函数,再由这个函数调用gethostbyaddr函数,最后系统在执行nss_dns_gethostbyaddr_r函数处崩溃。因此,会出现上述情况。
解决问题的办法是升级glibc。

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