SELinux from disabled to enforcing - is it possible?

[drago01]

On Sun, Jul 27, 2008 at 10:58 AM, Mike <mike.cloaked at gmail.com> wrote:
> Having got one machine running with SELinux enabled very recently I decided to
> try to turn SELinux back on for a machine on which I had installed F9 a few
> weeks ago and set SELinux to disabled.
>
> That was a definite no-no - it would not boot once I set SELinux back to
> enforcing unless I added "selinux=0" to the kernel line for boot.
>
> I resorted to re-installing F9 and it works fone now with SELinux enabled.
>
> However I now wonder if it was in fact possible to go from SELinux disabled
> to enforcing or if this is something which is not possible?
>
> If it is impossible then there perhaps ought to be a health warning asking
> the user if they really want to switch to disabled - saying that reversing
> the change is not going to work.
>
> I thought I would ask here if the process is actually possible?

do
touch /.autorelabel
boot with enforcing=0
after the relabling is done it should work.