[Openstack-operators] VM with a public IP

Matt Joyce matt.joyce at cloudscaling.com
Mon Aug 13 23:16:13 UTC 2012

I agree for the most part, but its important to remember that we don't
always get to choose what people will decide openstack is good for, and
odds are we'll find it doing some pretty crazy stuff as time progresses.  I
for one am excited to see the edge cases.


On Mon, Aug 13, 2012 at 4:02 PM, Narayan Desai <narayan.desai at gmail.com>wrote:

> On Mon, Aug 13, 2012 at 4:55 PM, Paul Walton <paul.d.walton at gmail.com>
> wrote:
> > Unfortunately, I do not manage the network, and do not have access to the
> > DHCP server.  This means that I do not have a subnet of IPs that I can
> > simply hand out freely to my VMs.  If I want a VM to have a public IP
> then
> > it must make a request to the campus DHCP server.  There are special
> cases
> > where I can assign static IPs to servers, but this is infeasible for the
> > majority of the VMs I will create since they will be used by students to
> > complete assignments in class, and will only exist during the course of a
> > semester.
> >
> > So, as I understand things so far, OpenStack assumes that I have my own
> > subnet of public IPs that I can freely use for my VMs?  I can't imagine
> this
> > being a reasonable design assumption to make on their part.  Perhaps I'm
> > overlooking something?
> The use model for external IP addresses is that they can be allocated
> and deallocated from projects on a relatively infrequent basis (ie
> address to project allocations last a long time, so that users can
> count on the external addresses not changing.)
> I'm not sure how IP addresses managed by external DHCP services could
> fit into this model robustly (ie they could disappear out from under
> you at any time). You could hack something up that leases and renews
> ip addresses on a long term basis, but this would definitely be a
> hack.
>  -nld
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