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Hi Jay,

If you are running nova-network in a mode that performs DHCP, you should be
sure that the network Nova is connecting VMs to does not have your
corporate DHCP server on it.  Having two conflicting DHCP servers on the
same network will give unpredictable results.  What may be happening is a
"race" between the two DHCP servers.

The second question is whether dnsmasq is actually running.  You didn't say
that you were using --multi_host=True, so by default the network may have
been assigned to either of the two network-nodes you created.  This would
mean that dnsmasq might be running on either of the two servers running
nova-network (either the controller server or compute server).  Can you
check if it is running on the other server?  If it is not running on
either, we'd probably have to see nova-network logs.   For more info on the
--multi_host flag, see:
http://docs.openstack.org/trunk/openstack-compute/admin/content/existing-ha-networking-options.html

Dan



On Tue, Feb 14, 2012 at 9:31 AM, Jayashree(Jay) Beltur
<jaybeltur at yahoo.com>wrote:

>   Hello,
> I have a two node cluster running on Ubuntu 11.04 (natty) with the Diablo
> release from ppa:openstack- release/ 2011.3
> [2011.3
> (2011.3-nova-milestone-tarball:tarmac-20110922115702-k9nkvxqzhj130av2)]
>
> Controller node  runs nova-compute, nova-volume, nova-network, nova-api -
> 2 NICs
> Compute node runs nova-compute, nova-network and nova_api - 2 NICs
>
> I am using flatDHCPManager.
>
> When I launch on instance on the compute node, the VM is getting ip from
> the company dhcp server. It is not getting IP from the dnsmasq-dhcp server.
> Also, I do not see dnsmasq-dhcp up on the compute node.
>
> In the console log, I see that
>
> Sending discover...
> Sending select for 16.89.26.95...
> Lease of 16.89.26.95 obtained, lease time 1296000
> starting DHCP forEthernet interface eth0  [  OK  ]
> cloud-setup: checking
> http://169.254.169.254/2009-04-04/meta-data/instance-id
> wget: can't connect to remote host (169.254.169.254): No route to host
> cloud-setup: failed 1/30: up 2.04. request failed
> wget: can't connect to remote host (169.254.169.254): No route to host
> cloud-setup: failed 2/30: up 6.05. request failed
>  How to bring up dnsmasq-dhcp on the compute node?
>
> Any help is appreciated.
>
> Thanks,
> -Jay
>
>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dan Wendlandt
Nicira Networks: www.nicira.com
twitter: danwendlandt
~~~~~~~~~~~~~~~~~~~~~~~~~~~
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