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= Ultra fast reboot

Technique pas recommandé

Voir 
* https://fr.wikipedia.org/wiki/Magic_SysRq_key

Source article complet :
* https://major.io/2009/01/29/linux-emergency-reboot-or-shutdown-with-magic-commands/

<code bash>
echo 1 > /proc/sys/kernel/sysrq 
echo b > /proc/sysrq-trigger
</code>

Ultra fast shutdown

<code bash>
echo 1 > /proc/sys/kernel/sysrq 
echo o > /proc/sysrq-trigger
</code>

== Autres

<code ->
last |head
root     pts/0        192.168.3.81    Thu May 11 09:19   still logged in
reboot   system boot  3.10.0-327.el7.x Thu May 11 09:17 - 09:24  (00:07)
process  pts/0        192.168.3.81    Wed May 10 16:42 - down   (00:00)
root     pts/0        192.168.3.81    Wed May 10 16:34 - 16:42  (00:07)
reboot   system boot  3.10.0-327.el7.x Wed May 10 16:31 - 16:42  (00:10)
process  pts/0        192.168.3.81    Wed May 10 16:30 - 16:30  (00:00)
root     pts/0        192.168.3.81    Wed May 10 16:28 - 16:29  (00:01)
reboot   system boot  3.10.0-327.el7.x Wed May 10 16:27 - 16:42  (00:15)
root     pts/0        192.168.3.81    Wed May 10 16:19 - crash  (00:08)
reboot   system boot  3.10.0-327.el7.x Wed May 10 16:15 - 16:42  (00:26)
</code>

<code ->
last -x shutdown
shutdown system down  3.10.0-327.el7.x Wed May 10 16:42 - 09:17  (16:34)
shutdown system down  3.10.0-327.el7.x Fri May  5 18:17 - 09:04 (3+14:46)
shutdown system down  3.10.0-327.el7.x Wed Apr  5 16:09 - 15:07 (29+22:58)
</code>

<code bash>
systemctl mask sleep.target suspend.target
uptime
ps -p 1 -o stime
lastb
chmod +s /sbin/halt
chmod +s /sbin/reboot
</code>



== Autres

<code bash>
exec /sbin/init
</code>