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

Vishvananda Ishaya vishvananda at gmail.com
Thu Dec 29 00:25:23 UTC 2011

In some cases when everything is on one interface you need to set your main bridge to promisc mode to get it to forward properly.

ip link set promisc on br100


On Dec 28, 2011, at 2:39 AM, Lucio Cossio wrote:

> 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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