<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Shoot the hostage.....<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 29, 2014 at 11:09 PM, Jim Kinney <span dir="ltr"><<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">So you're working away and suddenly you get a console error message:<br>
Kernel: BUG: <fill in your fav thing to break here><br>
and that console pukes and locks.<br>
You're loged in remote over and ssh session and screen. You can't reattach<br>
to that screen session and then, WHAM, another one pops in and informs you<br>
also that cpu core #19 has timed out for the past 67 seconds.<br>
<br>
and THAT console locks.<br>
<br>
Suddenly you get that sinking feeling in the pit of your gut as you realize<br>
you never did set the ipmi port IP address.<br>
<br>
You can ssh in but you have only a few seconds to do something before every<br>
new session you open locks up.<br>
<br>
If you can reboot, you can set the IPMI IP address. But even a remote KVM<br>
console hangs after you hit the 3-finger-salute and you know shutdown -r<br>
now will never finish since you have 3 consoles that are hung with that one.<br>
<br>
Now you're screwed.<br>
<br>
But, ah HA! a solution:<br>
<br>
If you could send an instant "reboot now and do no shutdown stuff" over an<br>
new ssh connection, it might get through.<br>
<br>
In that case, you want to know these commands:<br>
<br>
Force Reboot :<br>
*#echo 1 > /proc/sys/kernel/sysrq *<br>
*#echo b > /proc/sysrq-trigger*<br>
If you want to force shutdown machine try this.<br>
*#echo 1 > /proc/sys/kernel/sysrq*<br>
*#echo o > /proc/sysrq-trigger*<br>
<br>
So you run ssh <a href="mailto:root@brokenbox.com">root@brokenbox.com</a> 'echo 1 > /proc/sys/kernel/sysrq; echo b<br>
> /proc/sysrq-trigger' and your remote KVM console flashes to green as the<br>
video disconnects on the reboot. Resume breathing and reach for a tasty<br>
beverage.<br>
<br>
Now set that IPMI IP address...<br>
<br>
--<br>
--<br>
James P. Kinney III<br>
<br>
Every time you stop a school, you will have to build a jail. What you gain<br>
at one end you lose at the other. It's like feeding a dog on his own tail.<br>
It won't fatten the dog.<br>
- Speech 11/23/1900 Mark Twain<br>
<br>
<br>
*<a href="http://heretothereideas.blogspot.com/" target="_blank">http://heretothereideas.blogspot.com/</a><br>
<<a href="http://heretothereideas.blogspot.com/" target="_blank">http://heretothereideas.blogspot.com/</a>>*<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Pete Hardie<br>--------<br>Better Living Through Bitmaps
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