[Openstack] libvirtd and Folsom Quantum/Neutron and iptables

Daniel P. Berrange berrange at redhat.com
Fri Oct 25 08:14:50 UTC 2013

On Thu, Oct 24, 2013 at 04:02:04PM -0700, Craig E. Ward wrote:
> I have a Folsom installation that has re-tasked some of the host
> hardware. What was a nova compute node is now a Quantum (agent)
> node. In the conversion, the libvirtd service was not removed. It
> looks like it could be cause some issues with the iptables rules.
> Will libvirtd insert rules that may conflict with the rules inserted
> by Quautum? Or do I need to look elsewhere for conflicts?

It depends on the installation - if the libvirt default network is
present (eg virbr0 bridge device), then there will be a few iptables
rules present. I don't know if those will conflict with openstack
or not. A 'virsh net-destroy default'  'virsh net-autostart --disable default'
will remove the network libvirt has (if present).

> Is there any reason to leave libvirtd running on a Folsom Quantum node?

No, it is only required where 'nova-compute' is running.

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