Why Mysql server cannot be started

The Mysql server cannot be started. The error log prompts:
^ 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] cocould not open log file120415 8:59:10 [ERROR] Can't init tc log120415 8:59:10 [ERROR] Aborting www.2cto.com ======== ===================== a view is the mysql-bin.000013 File Permission changed: -rw ---- 1 root 126 Apr 15 mysql-bin.00 0013 the reason is that I used "/usr/local/mysql/bin/mysqld_safe -- user = root &" last time to start mysqld, so the binlog File Permission generated is changed to root. It is recommended that you do not use the root user to start mysql. The official documentation recommends that you use a non-root user to start mysql. The author rover0