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Hi Jeremy<br>
<br>
Nova-network has basically 3 modes (Flat, FlatDHCP and VLAN) while
neutron is designed to handle complex setups needing most
flexibility. And your setup seems to be complex so I think it
would be better of with Neutron networking.<br>
<br>
Thanks,<br>
Amit<br>
<br>
On 05/30/2014 01:21 PM, Jeremy Utley wrote:<br>
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<div>Hello list,<br>
<br>
</div>
I'm working on a proof-of-concept
openstack installation for my company, and
am looking for the answers to some
questions that I haven't been able to find
the answer to. Hopefully someone here can
help point me in the right direction!<br>
<br>
</div>
I've got a basic setup already in place - 2
controller nodes, 3 compute nodes (with 5
more ready to provision when we line
everything out). The main problems I'm
facing right now is in the networking. We
need to integrate this openstack setup with
the network resources already in place in
our setup, and I'm not exactly sure how to
do so. I'll start off with basically going
over how we are currently setup.<br>
<br>
</div>
1. Management and compute nodes are all
connected via infiniband networking, we are
using this as our cluster management network
(10.30.x.x/16). This network has zero
connectivity to anything else - it's
completely private for the cluster.<br>
<br>
</div>
2. eth2 on all compute nodes are connected to
each other via a vlan on our switch, and bridged
to br100 to be our openstack fixed network.
(10.18.x.x/16).<br>
<br>
</div>
3. eth1 on all compute nodes is connected up to
our existing colo private network. We are
currently defining this as our external network.
(<a moz-do-not-send="true"
href="https://urldefense.proofpoint.com/v1/url?u=http://10.5.20.0/22&k=uWCMTgG0stZxwOEwDWvrOA%3D%3D%0A&r=SrS6LVctHAotDvfalKfFvzCQXOUI4d%2BwuHpBCRhEqKk%3D%0A&m=%2FeM6hckXh%2FT8ZrfqIm26OhTyCt9D11gaZDh881YmkC0%3D%0A&s=d031a1f31c5f5feb90b90502c1812948448bf241c1e2a7d539311a5369eaca81">10.5.20.0/22</a>)
- In our current setup (with nova-network and the
FlatDHCPManager), I have taken a block of IP's
from this subnet and reserved them for use as
floating IP's for testing purposes - this is
working perfectly right now.<br>
<br>
</div>
4. eth0 on all compute nodes is connected to our
existing colo public network. We have a /19 public
allocation, broken up into numerous /24 and /25
segments to keep independent divisions of the
company fully segregated - each segment is a
separate vlan on the public network switches. In
what we currently have setup, we are not utilizing
this.<br>
<br>
</div>
Ultimately, we'd like to have our cluster VM's
connected to the fixed network (on eth2), and treat
both eth1 and eth0 as "public networks" we can use
floating IP's from. All VM's should connect to eth1
and be able to have floating IP's assigned from that
network to them, and they should be able to connect to
a single tagged vlan on eth0 as well.<br>
<br>
</div>
From the reading I've done so far, I think what we are
trying to do might be too complicated for nova-network,
since it depends on defining a single interface as the
public interface on the compute nodes, and we might
potentially have more. Am I interpreting that
correctly, or could we maybe accomplish this with
nova-network (perhaps using the VLANManager mode?)<br>
<br>
</div>
If we have to switch to Neutron, can you run the neutron
services on each compute node? We have concerns about
scale if we have to implement a separate network node, as
we could easily end up saturating a full gig-e interface
with this cluster in the future. Plus, the extra cost
expenditure of dedicated network nodes could end up
cost-prohibitive in the early stages of deployment.<br>
<br>
</div>
Anyone got any suggestions for us?<br>
<br>
</div>
Thank you for your time,<br>
<br>
</div>
Jeremy Utley<br>
</div>
<br>
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