[Openstack] Kilo Devstack - DCHP is not assigning IPs to the VMs

Ahmed Medhat a.medhat.h at gmail.com
Mon Jun 20 08:30:11 UTC 2016


Hi Neil,

Thanks for your reply.

I have done tcpdump on dhcp port of the private network in Openstack and I
saw the received dhcp request and replies. It seems tgat the replies are
not received to the VM.
I want to add tgat if I adjusted the ip manually inside the VM instance ,
it works fine and I can ping the dhcp ip 11.0.0.2 in my case.

I hope this info shows you where could be the problem I have.

Best regards,
Ahmed

On Monday, June 20, 2016, Neil Jerram <neil at tigera.io> wrote:

> Hi Ahmed,
>
> Unfortunately there are many possible reasons - and different ones
> depending on your setup.
>
> I will guess, though, that you're using a default OVS setup, without DVR.
> In that case DHCP should be provided by Dnsmasq running on your network
> node, and I would start by checking for that process and looking at its
> logs (which could be in /var/log/syslog, /var/log/messages, journalctl,
> ...) to see if there is any sign of DHCP requests being received, and then
> whether Dnsmasq sends any DHCP responses.
>
> Regards,
>      Neil
>
>
> On Sat, Jun 18, 2016 at 1:34 PM Ahmed Medhat <a.medhat.h at gmail.com
> <javascript:_e(%7B%7D,'cvml','a.medhat.h at gmail.com');>> wrote:
>
>> Hi All,
>>
>> I have installed kilo devstack and have a problem with dhcp, it is not
>> assigning IPs to the VMs.
>> What are the reasons for that ?
>>
>> Best regards,
>> Ahmed
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