[Novalug] virsh cheat sheet?

Crawford Rainwater crawford.rainwater@linux-etc.com
Thu Aug 15 14:27:02 EDT 2013


JF gets the idea.  I did leave out the DHCP to DNS portion previous I do admit, so thanks there. ;-)

--- Crawford

----- Original Message -----
> From: "John Franklin" <franklin@elfie.org>
> Sent: Thursday, August 15, 2013 12:21:37 PM
> Subject: Re: [Novalug] virsh cheat sheet?
> 
> If you run your own DHCP and DNS servers, you can have DHCP
> automatically update DNS.
> 
> jf
> 
> On Aug 15, 2013, at 13:57 , Crawford Rainwater wrote:
> 
> > John:
> > 
> > The VMs (including clones) have a unique MAC address, do they not?
> > ;-)  The DHCP server lease/release based on said MAC addresses
> > accordingly.  At the same time, use the MAC address for a look up
> > as well.
> > 
> > As I hinted to, there are "layers" above the hypervisor that have
> > such functionality built into them accordingly.  I believe (for
> > those "closed box" ones) and know (for the "FOSS based" ones) this
> > is a method used thanks to the MAC address per VM being unique.
> >  For Greg and your purposes (and others trying the same), you are
> > doing the "by hand" method below this layer which is a good
> > learning experience. :-)
> > 
> > HTH.
> > 
> > --- Crawford
> > 
> > The Linux ETC Company
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> > 
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> >  Be friendly to the environment by saving paper.
> > 
> > ----- Original Message -----
> >> From: "John Holland" <jholland@vin-dit.org>
> >> To: "Crawford Rainwater" <crawford.rainwater@linux-etc.com>
> >> Cc: novalug@calypso.tux.org
> >> Sent: Thursday, August 15, 2013 11:35:34 AM
> >> Subject: Re: [Novalug] virsh cheat sheet?
> >> 
> >> 
> >> Crawford,
> >> 
> >> thanks for diving in. What you said about DHCP etc interested me
> >> but
> >> I
> >> still don't understand. The situation I find myself in is that:
> >> 
> >> 1. I create VMs that use DHCP, which are often based on writable
> >> clones
> >> of a master disk image.
> >> 
> >> 2. I give them names when I create them, but don't know what their
> >> IP
> >> will be.
> >> 
> >> 3. Later, I might want to start one of them back up (virsh start
> >> machineName) but having done so, I don't know the IP. I guess in
> >> that
> >> case I can look for the DHCP information in the log.... But
> >> sometimes
> >> I've left one running for some days or more. At that point how can
> >> I
> >> get
> >> the IP?
> >> 
> >> Maybe I'm approaching this wrong. Tell me how I can solve this.
> >> 
> >> Thanks,
> >> John
> >> 
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> 
> --
> John Franklin
> franklin@elfie.org
> ICBM: 39º 01' 58.4"N 77º 24' 49.6"W Z+84m
> 
> 



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