How can I come up with a VM with 2 nics automatically configured by dhcp?

asked 2014-07-21 02:40:44 -0600

arturo.mayoral gravatar image

Hello devs,

I have an openstack cloud deployment with 1 controller node, 1 hybrid network/compute node with neutron-* services (l3, dhcp-agent, neutron-plugin-openvswitch-agent) and 2 more compute nodes with neutron-ovs-plugin and dhcp-agent in each of them.

I have configured three different networks in neutron: - Public - Private1 - Private2

I have been working with VMs in one of the private ones and everything have been working properly for a long time, but now I am trying to create VMs attached to the two Private networks at the same time with 2 nics. I can create them and no-errors occur but, when I open the console I discover that there is only one NIC configured by dhcp. The other one is created but is not "up-and-running" and the IP is not configured.

Furthermore, I detected that the VM only sends DHCP-Discover msgs of one of the Nics and I dont know why.

I am using Openstack Havanna distribution and the VMs are created with a Cirros-Image.

I would very appreciate if anyone could have any idea of which could be the problem.

Thanks you, Arturo Mayoral.

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That's right Beny,

I modified the Cirros image by adding another line in /etc/network/interfaces file:

auto eth1 iface eth1 inet dhcp

,and now I can boot an instance with two Nics which automatically are configured by DHCP agent.

Thanks you very much, Regards,


arturo.mayoral gravatar imagearturo.mayoral ( 2014-07-21 07:59:50 -0600 )edit

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answered 2014-07-21 06:59:59 -0600

Beny gravatar image

Hi Arturo,

I guess by default only one nic card is enabled in the cirros image.

So you could try bundle a new image with two nic cards enabled (eth0 and eth1) and launching an instance will get the dhcp address.

Thanks, Beny

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Asked: 2014-07-21 02:40:44 -0600

Seen: 1,284 times

Last updated: Jul 21 '14