Mysql服务器无法启动的原因简析

Mysql服务器无法启动，错误日志中提示:

^G/usr/local/mysql/bin/mysqld: File './mysql-bin.000013' not found (Errcode: 13)
120415  8:59:10 [ERROR] Failed to open log (file './mysql-bin.000013', errno 13)
120415  8:59:10 [ERROR] Could not open log file
120415  8:59:10 [ERROR] Can't init tc log
120415  8:59:10 [ERROR] Aborting ==============================
一查看是mysql-bin.000013文件的权限变为了:
-rw-rw---- 1 root root       126 Apr 15 00:10 mysql-bin.000013

原因是我上次使用了"/usr/local/mysql/bin/mysqld_safe --user=root ;"启动mysqld,所以产生的binlog文件权限变为root。
提醒一下启动mysql最好不要使用root用户，官方文档提倡用非root用户启动;