آپگرید mysql و از کار افتادن آن

[dc.saeed]

[root@server1 ~]# mv /etc/my.cnf /etc/my.cnf.bak
mv: overwrite `/etc/my.cnf.bak'? y
[root@server1 ~]# service mysqld restart
MySQL server PID file could not be found!                  [FAILED]
Starting MySQL.The server quit without updating PID file (/[FAILED]mysql/server1*********.pid). 

تشکر ولی رفع نشد