[Openstack] How to work with Flat DHCP Grizzly

Calvin Austin caustin at bitglass.com
Thu Jul 25 17:44:58 UTC 2013

Openstack networking can be very frustrating, the guide you are following
is for quantum so you don't use nova.networking configurations.

1. download the cirros image in the tutorial , you can then login via vnc
without networking and rebuild a static network on that image for testing

Quantum is managing the dhcp so look at the dhcp logs to see if it even
received the request, I believe quantum still uses dnsmasq for managing
dhcp, tcpdump -i the bridge to see if you see where the request is going.

The guide you are using seems quite specialized, I would suggest comparing
with other guides, I use nova networking myself.


On Thu, Jul 25, 2013 at 4:16 AM, comiqadze <comiq at yandex.ru> wrote:

> Hi, folks!
> Does somebody know any guide for installation of the Flat DHCP step by
> step?
> I followed this guide for building the system:
> https://gist.github.com/tmartinx/d36536b7b62a48f859c2
> my system is: 2 machines with ubuntu 12.04. one compute, one controller.
> I neatly followed this guide, except for one thing: my IPs for controller
> and compute nodes and for instances are of the same network.
> Controller, Compute - x.x.15.70, 71. Instances pool: x.x.15.230-240
> Do I need to specify Network Manager in nova.conf?
> Like: network_manager=nova.network.manager.FlatManager
> flat_network_bridge=br-eth0
> flat_interface=eth0
> Currently I can create an instance, I can see it's IP in Dashboard, but I
> cannot ping it. And inside there is no network.
> Even when I manually changed Interfaces file, I still cannot ping it.
> When I load Ubuntu instance, it requests login and password? Does somebody
> know where I can find it?
> Thank you. Any help will be very appreciated.
> regards, comiq
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