[Openstack] Network problem: Instances from non-nova-network can't reach outside

Alisson Soares Limeira Pontes apontes at cpqd.com.br
Wed Dec 28 14:07:36 UTC 2011

I am not sure why, but

"sharing the same Network Interface means these three subnets share the
same range. Using the same subnet for Management and Storage network is
common place and should not be an issue, but sharing the Public network
subnet can be tricky."

Is this your case? Probably someone here can better explain why share the
same interface for the Public network is not a good idea.

2011/12/28 Lucio Cossio <lucio_cossio at yahoo.com.br>

> Hello Guys, I'm testing a dual node installation of OpenStack Nova with
> Glance, and i really hope someone can help me with my current problem.
> My setup is like that:
> - First Node : All nova components plus Glance
> - Second Node : nova-compute
> I'm using diablo version  that was installed from the ubuntu repository,
> which i suppose is the nova 2011.3+git20111117-0ubuntu1 oneiric version.
> For what a read, the second node only needs nova-compute ,but sometimes i
> see others saying about using nova-network together. I'm using machines
> that have just one network interface, so they are in the same network with
> other non-OpenStack computers (this network uses dhcp).
> At the network configuration i'm using flatDHCP. The nova.conf file can be
> see here (the ip is not exactly what im using, is just a template):
> http://paste.openstack.org/show/3978/
> So, i'm able to install and run virtual machines in both nodes. My problem
> is, for any instance that is running on the second node, i can't connect
> with the outside world (i can ssh and ping it from the first node, but not
> from an outside computer). Into the first node all goes fine.
> If i restart nova-network (not exactly one time, sometimes more) at some
> point nova-network goes down, and then i'm able to ping the instances. Is
> like the configuration is good but the service break. The error that
> appears on logs is Stderr: 'RTNETLINK answers: File exists\n' -
> http://pastebin.com/qYhhYS6h
> Currently i'm trying the same configuration in another 2 computers, using
> the diablo-final version of the rcb repository, as the openstack forum
> suggest. The errors is different. From what i remember (i'm not the only
> working with that) i was not even able to ping instances from outside after
> restarting the nova-network.
> Then we tried to use nova-network with the second node too. After some
> time, new instances running on the second node start gracefully, and i can
> ping them from outside, however i can't run instances on the first node
> anymore. There's no log errors at nova or qemu folder, i can vnc to the
> instance but it appears stopped (cant do nothing).
> I appreciate any help
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Alisson Pontes
Network Technology Evolution Researcher
CPqD - Center for Research and Development in Telecommunications
Tel.: +55 19 3705-4996
apontes at cpqd.com.br <aponte at cpqd.com.br>
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