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Eugen,

I think config-drive make sense when you don't have initial network in
place. In my case i don't care about fixed-IP for instance. I only
need to setup network using whatever IP neutron provide in that case
how do i query neutron port to find out what IP address is available
or neutron going to provide so i can take that information and pass to
userdata. Its sounds tricky any idea how to do that?

On Thu, Aug 25, 2016 at 2:53 AM, Eugen Block <eblock at nde.ag> wrote:
> Hi,
>
> we've been trying to learn how to feed cloud-init with ip addresses, too. If
> DHCP is disabled in your network, the instance won't get it's eth0
> configured and won't be able to query the metadata server.
> Creating a port before attaching it to a booting instance also doesn't work
> if no dhcp is running on that network, I just tried that to be sure.
>
> I've tried several ways but I only found one working option. For external
> networks (or networks without dhcp) we are using config-drive now. Depending
> on the OpenStack version it could be possible that you'll need
> cloud-init-0.7.7, we had to fix two issues ourselves in version 0.7.6 to get
> it working, one of them was a missing default route.
>
> With enabled config-drive the instance doesn't need a configured interface,
> it's a temporarily mounted drive from where the required information is read
> by cloud-init.
> You can either add the option "--config-drive true" in your nova boot call
> or check the checkbox in Horizon.
>
> To answer your question about ports, you can create a new port either in
> Horizon, but there you won't be able to assign a specific ip address. If you
> want a specific ip address you have to call neutron port-create (port-name
> is optional):
>
>    neutron port-create <NETWORK-ID> --fixed-ip
> subnet_id=<SUBNET-ID>,ip_address=<IP> --name <PORT-NAME>
>
> The resulting ID of that port can be used in nova boot call:
>
>    nova boot --flavor 2 --image <IMAGE> --nic port-id=<PORT-ID>
> <INSTANCE-NAME>
>
> Another way to assign a specific ip address to a booting instance without
> port-creation (but DHCP has to be enabled) would be:
>
>    nova boot --flavor 2 --image <IMAGE> --nic
> net-id=<NET-ID>,v4-fixed-ip=<IP> <INSTANCE-NAME>
>
> for example:
>    nova boot --flavor 2 --image dc05b777-3122-4021-b7eb-8d96fdab2980 --nic
> net-id=4421e160-d675-49f2-8c29-9722aebf03b2,v4-fixed-ip=192.168.124.6 test1
>
> Hope this helps!
>
>
> Zitat von Satish Patel <satish.txt at gmail.com>:
>
>
>> My question is how to query ports and pass info to cloud-init?  is
>> there any document or api which i can call using script and setup
>> network ifcfg-eth0 file
>>
>> On Wed, Aug 24, 2016 at 5:38 PM, Kaustubh Kelkar
>> <kaustubh.kelkar at casa-systems.com> wrote:
>>>
>>> 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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>>
>>
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>
>
>
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