[ncolug] Re: vm
- From: "Chuck Stickelman" <CStickelman@xxxxxxxx>
- To: <ncolug@xxxxxxxxxxxxx>
- Date: Thu, 22 Nov 2007 23:11:18 -0500
Larry, I think you mised the point of my prevoius message...
The guests *should* shut down cleanly when the Hypervisor sends them a SIGHUP.
(...regardless of why the Hypervisor sends the signal...) Sending a SIGHUP to
the guest VM *should* be the same as choosing to shut it down from inside the
VM...
They are, afterall, just Linux apps...
Of couse the UPS doesn't send the SIGHUP that's the job of the Linux
Hypervisor. Which is the best choice for monitoring the UPS... Though some UPS
monitoring applications have LAN awareness and can push the UPS status out to
multiple systems - both Physical and Virtual...
Chuck
-----Original Message-----
From: "larry" <larry@xxxxxxxxxxxx>
To: "ncolug@xxxxxxxxxxxxx" <ncolug@xxxxxxxxxxxxx>
Sent: 11/22/2007 10:32 PM
Subject: [ncolug] Re: vm
No, the guests do NOT "shut down cleanly" just because you stopped or
shut down the hypervisor.
You want to talk about "standards" in regard to UPS signaling
behaviour?! Which of the dozen or so standards would you like to discuss?
Mike wrote:
> Chuck Stickelman wrote:
>> So what I hear you say is:
>> Hook the UPS to the physical machine
>> Have the host OS monitor the UPS's state
>> When the UPS signals the host it sends a SIGHUP to the Virtual Machines
>> The VMs should then interpret the SIGHUP as a Shutdown command
>>
>> Is that what you had in mnd?
>>
>> Does anyone know if that's how it works?
>>
>> Chuck
>
> Yes.
>
> The signal may depend on the VM design though. I would hope they have
> used enough sense to honor some standard.
>
> This really is a near trivial problem. The guests shutdown cleanly
> during a normal shutdown, yes? Why should a shutdown instituted by
> UPS software or even admin written (monitoring) scripts be any different?
>
> Mike
>
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>
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to take a distanced view of close things."
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