mysql Not starting on Fedora 16

[antonio_helder2002]

installed mysql-5.5.21-1.fc16.i686, mysql-server-5.5.21-1.fc16.i68 from rpmfusion repo
trying to run

sudo systemctl start mysqld.service

error

Job failed. See system logs and 'systemctl status' for details.

then ran

sudo systemctl status mysqld.service

result

mysqld.service - MySQL database server
	  Loaded: loaded (/lib/systemd/system/mysqld.service; disabled)
	  Active: failed since Wed, 28 Mar 2012 13:38:27 +0530; 1min 53s ago
	 Process: 5100 ExecStartPost=/usr/libexec/mysqld-wait-ready $MAINPID (code=exited, status=1/FAILURE)
	 Process: 4961 ExecStart=/usr/bin/mysqld_safe --nowatch --basedir=/usr (code=exited, status=0/SUCCESS)
	 Process: 4945 ExecStartPre=/usr/libexec/mysqld-prepare-db-dir (code=exited, status=0/SUCCESS)
	Main PID: 5098 (code=exited, status=1/FAILURE)
	  CGroup: name=systemd:/system/mysqld.service

How do I start the server??

[atreyu]

check the output of the MySQL log, usually /var/log/mysqld.log, and also look in /var/log/messages. maybe there is additional info in one of them. it is possible that a required directory does not exist, or has the wrong permissions. also it may be a problem if it is an botched mysql-server upgrade. speaking of which, you can try updating the package, too, in case a fix was implemented:

yum update mysql-server

also, is SELinux enabled? This can cause problems, too. Check if on with:

getenforce

and temporarily (until a reboot) disable SELinux with:

setenforce 0