[Mongrel] [Slightly OT] Do you use virtualization in production ?

Carl Lerche carl.lerche at gmail.com
Wed Oct 4 01:45:55 EDT 2006


This sounds really sweet, I'm definitely going to have to look into
this more. It would simply pretty much everything from deployment to
backups.

-carl

On 10/3/06, Luis Lavena <luislavena at gmail.com> wrote:
> On 10/3/06, Scott Laird <laird at google.com> wrote:
> > On 10/2/06, Luis Lavena <luislavena at gmail.com> wrote:
> >
> > > Ezra, one thing that still bug me is IP handling. If i have a live
> > > server and decide to do a hot migration to a newer box, how it
> > > manages, and how much downtime will get to the IP switches ges
> > > notified of the migration? (in ms resolution)
> > >
> > > Or i'm forced to have a load balancer that handle the problem for me?
> >
> > If you're doing it right, the switches should notice within a few
> > milliseconds.  Any reasonable virtualization setup will have to assign
> > a virtual MAC address to each virtual ethernet interface, and the MAC
> > address should transfer between machines along with the rest of the
> > VM.  So, assuming that both machines are on the same L2 network, it's
> > just a matter of the new machine sending an Ethernet frame or two out
> > its interface using the virtual MAC address as the source address.  To
> > the switch, it'll look like the virtual server was unplugged from one
> > port and plugged into the new one, which isn't a big deal.  I'd be
> > amazed if VMWare didn't have code in it to explicitly trip this, but
> > even without it it'll happen almost instantly.
> >
>
> Thank you for your answer Scott, I'll investigate Xen further on my
> spare time the following months.
>
> Regards,
>
> >
> > Scott
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> >
>
>
> --
> Luis Lavena
> Multimedia systems
> -
> Leaders are made, they are not born. They are made by hard effort,
> which is the price which all of us must pay to achieve any goal that
> is worthwhile.
> Vince Lombardi
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