[ncolug] Re: vm
- From: "Chuck Stickelman" <CStickelman@xxxxxxxx>
- To: <ncolug@xxxxxxxxxxxxx>
- Date: Fri, 23 Nov 2007 11:07:43 -0500
Look, the Hypervisor is running ontop of Linux. From that perspective each
Virtual Macine is a Linux process. What else could it be? If they are Linux
processes then they will respond to Linux inter-process communications. What
more is there for me to do? If you want, I can run a 'ps' command on authentic
in ASG's lab and show you...
The Windows/MAC OSs wn't see the SIGHUP. The Virtual Mahine layer will catch
that and translate it into an OS-specific shutdown.
This is exactly what Jim's scriCan you back up your statement that an instance
of Windows NT appears to
the hypervisor to be a Linux app? Even id the hypervisor is a Windows
application? Doesn't make sense to me.
I stand by my statement that a SIGHUP is meaningless to any OS other
than Linux.
Chuck Stickelman wrote:
> Writing a program that sends a SIGHUP to another process upon a specific
> event id trivial. I'm not programmer butr I could do it in a BASAH script.
>
> >From trhe hypervisor's point of view they are Linux apps and therefore
> >should behaive as such. Linux apps should behaive properly when they catch
> >a signal. The shell-script that was posted earlier effectively does just
> >that.
>
> The good would be that the guest OS would initiate a shutdown upon seeing the
> SIGHUP from the Hypervisor... Sems pretty useful to me...
>
> Chuck
>
>
> -----Original Message-----
> From: "larry" <larry@xxxxxxxxxxxx>
> To: "ncolug@xxxxxxxxxxxxx" <ncolug@xxxxxxxxxxxxx>
> Sent: 11/23/2007 9:40 AM
> Subject: [ncolug] Re: vm
>
> I am quite sure I am missing things, the point of your message being
> only one of many... that is why I am running this by you all.
>
> 1.) no one has verified that any hypervisor is ABLE to send a SIGHUP in
> response to an external event
> 2.) they are *not* "after all, Linux apps" - they are instances of
> operating systems
> 3.) if it did send it, what good would that do for a Windows guest? Or a
> MAC OS guest?
>
>
> Chuck Stickelman wrote:
>
>> 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
>>>
>>> To unsubscribe send to ncolug-request@xxxxxxxxxxxxx with 'unsubscribe'
>>> in the Subject field.
>>>
>>>
>>>
>>>
>>
>>
>
>
--
"Perception is strong and sight weak. In strategy it is
important to see distant things as if they were close and
to take a distanced view of close things."
Miyamoto Musashi (1584-1645)
To unsubscribe send to ncolug-request@xxxxxxxxxxxxx with 'unsubscribe' in the
Subject field.
To unsubscribe send to ncolug-request@xxxxxxxxxxxxx with 'unsubscribe' in the
Subject field.
Other related posts:
