军哥你好！lnmp出现500错误。自己找不到原因了

cnhaon

/etc/init.d/mysql restart
MySQL manager or server PID file could not be found! ... failed!
Starting MySQL
Couldn't find MySQL manager (/usr/bin/mysqlmanager) or server (/usr/bin/mysqld_safe) ... failed!


之前删除了金庸的几个open函数，以及下载了sendmail并安装了。。。。。重启后就是这么个情况。。。打开网站是500

打开discuz是下面代码：
Discuz! Database Error(2002) notconnect
PHP Debug

No.	File	Line	Code
1	forum.php	49	discuz_application->init()
2	source/class/discuz/discuz_application.php	65	discuz_application->_init_db()
3	source/class/discuz/discuz_application.php	373	discuz_database::init(%s, Array)
4	source/class/discuz/discuz_database.php	23	db_driver_mysql->connect()
5	source/class/db/db_driver_mysql.php	74	db_driver_mysql->_dbconnect(%s, %s, %s, %s, %s, %s)
6	source/class/db/db_driver_mysql.php	87	db_driver_mysql->halt(%s, %d)
7	source/class/db/db_driver_mysql.php	218	break()

查找网上的教程资料无果。。。另外。。确实没找到MySQL manager (/usr/bin/mysqlmanager) or server (/usr/bin/mysqld_safe)

licess

ln -s /usr/local/mysql/bin/mysqlmanager /usr/bin/
ln -s /usr/local/mysql/bin/mysqld_safe /usr/bin/

500不好说什么原因