DHCP timeout when creating instances for specific tenants

Grant Morley grant at civo.com
Wed Dec 4 23:40:28 UTC 2019

Hi Eric,

Thanks for getting back to me. I am fairly sure it is a DHCP error. The 
instances are getting an IP when they eventually boot, it is just taking 
a long time for them to bring up networking. The strange thing is, it 
only seems to be new tenants. All existing tenants are absolutely fine.

I can check DNS as well just to be on the safe side, however I wasn't 
seeing any errors in the Nova or Neutron logs when the instance(s) were 
being created.


On 04/12/2019 22:47, Eric K. Miller wrote:
> Hi Grant,
> Are you sure this is a DHCP timeout and not a DNS resolution issue?  I 
> ask because we have seen a strange DNS issue occur that can cause 
> something similar.
> Are the VMs being assigned an IP after they finally boot?
> Eric K. Miller
> Genesis Hosting Solutions, LLC
> Try our Genesis Public Cloud - powered by OpenStack!eut
> https://genesishosting.com/
> *From:*Grant Morley [mailto:grant at civo.com]
> *Sent:* Wednesday, December 04, 2019 11:00 AM
> *To:* openstack-operators at lists.openstack.org
> *Cc:* Ian Banks
> *Subject:* DHCP timeout when creating instances for specific tenants
> Hi all,
> I wonder if anyone can help shed any light on an odd issue we are 
> seeing with only a couple of specific tenants. Basically if they 
> launch an instance they are taking about 5 minutes to launch rather 
> than our usual 30 second or so launch.
> We are seeing the following on the instance logs:
> https://pastebin.com/hDstsd8G
> Weirdly it only seems to be happening for 1 or 2 new tenants. I have 
> tested this on our personal account and a few other customers have 
> tested and their instances launch really quickly as expected.
> Is there anything specific during the tenant creation that can cause 
> this issue? Or are there any logs in nova / neutron I should be 
> looking out for that might shed some light?
> I haven't seen anything that is obvious. Any help would be much 
> appreciated as we are a little stumped at the moment.
> Many thanks,
> -- 
> Grant Morley
> Cloud Lead, Civo Ltd
> www.civo.com <https://www.civo.com/>| Signup for an account! 
> <https://www.civo.com/signup>
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