[Openstack] Quantum dhcp-agent getting out of sync with multiple instance launch / termination

Gary Kotton gkotton at vmware.com
Wed Oct 9 14:15:57 UTC 2013

There was a bug that was related that was fixed a number of months ago -
https://bugs.launchpad.net/neutron/+bug/1191768. I suggest that one of the
guys working on RDO take a look.

On 10/9/13 4:57 PM, "Markku Tavasti" <markku.tavasti at cybercom.com> wrote:

>We are running grizzly-based, RedHat RDO.
>On 10/09/2013 04:50 PM, Gary Kotton wrote:
>> Hi,
>> Which version are you using?
>> Thanks
>> Gary
>> On 10/9/13 4:34 PM, "Markku Tavasti" <markku.tavasti at cybercom.com>
>>> I found out that quantum dhcp agent gets out of sync when many
>>> are launched or deleted same time. As a result, dnsmasq host-file have
>>> lines missing (all launched are not added), or some lines aren't
>>> when they should. When same ip is re-used, remaining extra lines aren't
>>> removed, but same ip has two lines, and dhcp discoveries get no
>>> (no address available error on dnsmasq logs).
>>> Restarting quantum-dhcp-agent will get everything back to proper state,
>>> but running restart on cron every minute does not sound proper fix :-(
>>> On my test, creating 16 instances, 2-3 of them did not get line in
>>> host-file. When removing all those 16, 3-5 false lines were left
>>> On instance creation I see following message on quantum-server.log:
>>> For every instance:
>>> WARNING [quantum.db.agentschedulers_db] Fail scheduling network
>>> {'status': u'ACTIVE', 'subnets':
>>> [u'e9299278-bd49-4dc8-8df1-25b034f3ecea'], 'name': u'pk_tunk2',
>>> 'provider:physical_network': u'vlans-osprv', 'admin_state_up': True,
>>> 'tenant_id': u'06b9c423e10741ef83877b56d7608d7f',
>>> 'provider:network_type': u'vlan', 'router:external': False, 'shared':
>>> False, 'id': u'cbce52ef-58ba-4f3c-96fb-9d51bdbf32fb',
>>> 'provider:segmentation_id': 427L}
>>> However, network ports get created, and seems to work?
>>> And most likely related to missing lines on host file on creation:
>>> WARNING [quantum.scheduler.dhcp_agent_scheduler] No active DHCP agents
>>> For termination of instances there is no warning or error messages.
>>> Any ideas for fixing the situation?
>>> --Tavasti
>>> _______________________________________________
>>> Mailing list:
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>> Post to     : openstack at lists.openstack.org
>>> Unsubscribe :
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack

More information about the Openstack mailing list