Re: [gentoo-user] Re: How to poweroff the system from user?

[Fernando Rodriguez]

On Tuesday, March 31, 2015 1:57:32 AM Fernando Rodriguez wrote:
> On Sunday, March 29, 2015 12:23:00 PM lee wrote:
> > Philip Webb <purslow@××××××××.net> writes:
> > What's the last time you pressed Ctrl+Alt+Del and it actually worked?
> > It's a legacy thing from times when freezes/crashes were common and when
> > it did work and was useful.
> >
> > Nowadays, when you're pressing it, usually nothing happens anyway
> > because the machine is down to where you have to press the reset button
> > or to turn off the power (if you can't log in with ssh).  When the
> > machine still works, Ctrl+Alt+Del also works, which means that the
> > default does nothing but create a security hole.
>
> On Linux now there's the Magic SysRq Key feature for that. If enabled (I
think 
> it is by default, may be wrong) you can use ctrl-alt-sysrq plus one these
keys 
> even if your kernel panics or freezes in most cases (ctrl may only be needed
> from xorg):
>
> r - to get the keyboard back so you can switch to VT if xorg freezes
> e - to terminate all processes gracefully (SIGTERM) except pid 1
> i - to terminate all processes forcefully (SIGKILL) except pid 1
> s - to sync all filesystems
> u - to unmount them and remount readonly
> b - to reboot
>
> Easy to remember as "Reboot Even If System Utterly Broken"
> There's a lot of other commands in the kernel docs sysrq.txt
>
> > So how can we have this default changed?
>
> Somebody posted that on this very thread. Replace the ctrlaltdel entry on
> inittab with /bin/false.
>
>
Actually it says after a crash or freeze but not a panic.
-- 
Fernando Rodriguez