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