[Openstack-operators] VM with a public IP
Kiall Mac Innes
kiall at managedit.ie
Tue Aug 14 08:02:49 UTC 2012
On Mon, Aug 13, 2012 at 10:55 PM, Paul Walton <paul.d.walton at gmail.com>wrote:
> 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?
As others as explained, but I don't believe as clearly as possible, you
likely can fit OpenStack into your existing network.
I'll see if I can do better - the 'nova-network' service runs on 1 or more
servers, each of these servers (which may also host the 'nova-compute'
services - but not necessarily) must have a network interface on your
This subnet is currently managed by your organisations DHCP. If you can ask
your network admins to reserve/exclude a selection of IPs from DHCP
allocation, and if your network setup will allow those IPs to be used by
simply assigning to one of the 'nova-network' servers, you can use
OpenStack without problems.
These IPs need not be contiguous - eg you can be allocated 18.104.22.168, 22.214.171.124
and 126.96.36.199 and this will work.
At that point - those IP's can be added as floating IPs in nova, and
assigned to instances on any of the 'nova-compute' servers.
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