What are the steps to use an external dhcp server with vlan or flat provider?

asked 2018-07-19 08:58:09 -0600

tonyp12 gravatar image

I have a Pike openstack with 1 controller/network node and 2 x compute nodes.

The controller / network node is a VM. The compute nodes are physical.

I have configured a VLAN network and launched some instances but they are not receiving DHCP most of the time. BTW the gre networks and floating ip's to through the controller/network node is working fine but as it's a VM there's a limitation where I'm unable to use VLANs through the VM.

I decided to configure an external dhcp server for the VLAN network. What I find is 1) the external DHCP server offers a DHCP to the instance on openstack, but openstack shows that it has a different IP. This in turn breaks IP connectivity to the instance because the iptables rules do not match the instances IP. I have tried having no dhcp on the openstack network config but I find that openstack still configures an ip there.

How can I move completely to external dhcp for the VLAN network? Seems it's conflicting with openstack somewhere, but i am unsure as to where exactly.

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would be interested as well. I have an OpenStack installation with a configured VLAN, and the DHCP IP address should be assigned by an external IP provider and from any OpenStack allocation pool configured for this particular network...

fattony666 gravatar imagefattony666 ( 2018-09-05 08:58:46 -0600 )edit

Hi tonyp12, how did you solve your issue?

Alex Sousa gravatar imageAlex Sousa ( 2018-11-05 05:47:52 -0600 )edit

I too am very interested in this.

Alain Edwards gravatar imageAlain Edwards ( 2019-10-21 16:19:38 -0600 )edit