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SELinux (Security-Enhanced-Linux) is a fine granulated protection introduced with Linux Kernel 2.6.
SELinux
controls the access of processes not only to files - but also to
devices, sockets, ports and other processes.
If a process needs
access to an object controlled by SELinux, this has to be permitted
by a policy; i.e. permitting commands in a text-file.
Overview:
Setting a SELinux-Policy for MySQL-Database (not yet written)
Open
the application for setting firewalls and SELinux parameters:
Select
>Applications>System
Settings>Security Level.
In
the 'Security Level Configuration' window click the 'SELinux'
tab.
Uncheck the
'Enabled (Modification Requieres Reboot) mark.
Click the
[ OK ] button thereafter.
Thereafter
a 'Warning' window appears, telling that the security level and the
firewall will be overridden.
Confirm this warning by click
the
[ Yes ] button.
The
change requieres a restart of the machine !
TestOpen
a Terminal-window in Linux and enter the following
command:.
/usr/sbin/sestatus
The
output should reflect, that SELinux is disabled: 
To
be written.