how to force a hard reboot remotely
kline at thought.org
Sun Jul 17 04:26:55 UTC 2011
On Sat, Jul 16, 2011 at 10:39:06PM -0500, Ryan Coleman wrote:
> Date: Sat, 16 Jul 2011 22:39:06 -0500
> From: Ryan Coleman <editor at d3photography.com>
> Subject: Re: how to force a hard reboot remotely
> To: Bill Tillman <btillman99 at yahoo.com>
> Cc: freebsd-questions at freebsd.org
> X-Mailer: Apple Mail (2.1084)
> When bottom replying, please clear the header and signature - thanks.
> You can set up a BIOS boot time, if you can get onsite... that would allow you to power it down at, say, 11:59PM and have it power back on at Midnight.
> Or a UPS that's controlled by another machine. Or the magic packet WOL option... but those require another machine. Maybe a switch or router than can send WOL packets would be a possibility?
I had something like this in late 1995. Remotely
"shutdown -h [time]" got my box powered down, then a
remote timer cycled the power. Problems were: that the
timer was hard to set exacrly. [There may have ben two
timers; it was a bear of a problem. ]
> On Jul 16, 2011, at 10:31 PM, Bill Tillman wrote:
> > WOW! That's a tall order. A reboot from remote is simple, but a cold boot....I
> > don't think that's possible unless you have some kind of Wake-On-Lan capable NIC
> > which could detect a connection attempt while the machine is off. I can't say
> > that for sure because what you've got to remember is that with a cold boot, the
> > machine will no longer remember what OS it was running until it reboots. My
> > advice would be to get to the console if you absolutely have to cold boot it. Or
> > call someone nearby the console and have the actually turn the machine off, wait
> > the obligatory 30 seconds and then restart it. Someone else may have a better
> > idea.
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Gary Kline kline at thought.org http://www.thought.org Public Service Unix
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