Open Stack

You can create the ports beforehand and plug them in while creating the instance. As for assigning IP addresses, you can query the ports and pass the information to cloud-init. I am not sure if there is any other way to do this.

Even if DHCP is disabled, OpenStack assigns IP information to ports when a VM is created, and you can see this in your dashboard. The MAC and IP information is used to configure iptables rules within security groups. Here is the archived thread that provides this information: http://lists.openstack.org/pipermail/openstack-dev/2014-December/053069.html. 


-Kaustubh

> -----Original Message-----
> From: Satish Patel [mailto:satish.txt at gmail.com]
> Sent: Wednesday, August 24, 2016 5:05 PM
> To: James Downs <egon at egon.cc>
> Cc: openstack <openstack at lists.openstack.org>
> Subject: Re: [Openstack] Guest VM IP configuration script
> 
> I am using neutron networking with vlan ( its provider VLAN). We are not using
> DHCP but i need some kind of hack to inject IP address in instance using cloud-
> init.
> 
> We are using cloud-init but i don't know how does it work and get IP from
> neutron. I am new with neutron stuff.
> 
> On Wed, Aug 24, 2016 at 4:29 PM, James Downs <egon at egon.cc> wrote:
> > On Wed, Aug 24, 2016 at 03:25:26PM -0400, Satish Patel wrote:
> >> I enabled following in nova.conf on compute node but didn't work :(
> >>
> >> flat_injected=true
> >>
> >> Do i need to do anything else?
> >
> > Are you using flat networking?
> > Nova-networks or Neutron?
> >
> > At this point, if you're not using DHCP, your only option is to arrange to feed
> the networking information into the metadata for the VM at creation time, and
> use someting like cloud-init to configure the networking. The ancient
> networking injection stuff has either been removed, or been broken for years.
> >
> > Cheers,
> > -j
> >
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