2016-03-09T07:51:38.905444Z 0 [ERROR] /usr/sbin/mysqld: Can‘t create/write to file ‘/var/run/mysqld/mysqld.pid‘ (Errcode: 2 - No such file or directory)
2016-03-09T07:51:38.905481Z 0 [ERROR] Can‘t start server: can‘t create PID file: No such file or directory
2016-03-09T07:51:38.931861Z mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
/var/run/mysqld/mysqld.pid这个文件路径是在“/etc/init.d/mysqld”中配置的
原文：http://www.cnblogs.com/vickygu2007/p/5258526.html