[one-users] Dynamic IP Leases and NIC hotplug on Running VM

[Simon Boulet]

Hi Shank, Carlos,

@Shank I dont see why this breaks anything. Users can already submit
VM with multiple NICs. Plus I believe NIC hotplug is supported by most
hypervisors out there. Say I run a load balancer VM, I can't afford to
have to restart the VM to add NIC/ IP address. I know I can simply
hotplug the NIC from the host but the problem is that OpenNebula
handles the IP Leases. I need to a way to tell OpenNebula that a new
IP address is used /reserved by the VM.

@Carlos

I would be more than happy to help. Here is what I believe needs to be
implemented:

1- Implementing two new calls in the oned XML RPC API (on.vn.assign
and on.vn.unassign)

Standard OpenNebula checks / assignment ie. make sure the user has
access to the Virtual Network and that an IP address is available.

2- Implement 2 new VNM scripts ex. addnic and remnic

There could be several ways of implementing those scripts depending of
the hypervisors (VNM driver of the host). The script would receive
sufficient information to know to which VM the new NIC is to be
attached ex. : base64 encoded XML containing the new <NIC>..</NIC> and
the VMID as a second parameter?

3- Implement "assign" and "unassign" calls in onevnet cli and Sunstone.

I believe we have sufficient knowledge and time here to add this
feature (the oned XML-RPC call, the custom VNM we use here, and could
do the Sunstone part too... would need someone for the cli work as
well as for adding the addnic and remnic to the different VNMs).

I need confirmation this is how we should be implementing it, and
maybe some help through the process. Feel free to contact me directly,
or direct me to another mailing-list for development work.

Simon

2012/3/23 Carlos Martín Sánchez <cmartin at opennebula.org>:
> Hi Simon,
>
> That functionality is not available in OpenNebula at the moment, but it is
> something we have in mind to be included at some point in the mid or
> long-term.
>
> I'm not sure if your email is a feature request, or you were asking for
> comments on how to implement it. We can give you support if that is the
> case.
>
> Regards
> --
> Carlos Martín, MSc
> Project Engineer
> OpenNebula - The Open-source Solution for Data Center Virtualization
> www.OpenNebula.org | cmartin at opennebula.org | @OpenNebula
>
>
>
> On Thu, Mar 22, 2012 at 10:38 PM, Simon Boulet <simon at nostalgeek.com> wrote:
>>
>> Hello
>>
>> I'd like to be able to Add IP addresses (Leases) to running VM (hot
>> plugging new NIC).
>>
>> Is this something possible? From what I understand this is not
>> possible (as of OpenNebula 3.3). A VM would have to be destroyed and a
>> new template submitted.
>>
>> My thinking was something like adding a one.vn.assign API call and an
>> "assign" option under the Lease Management page (on Sunstone). Then a
>> window would come up where you can pick an existing VM. However, I am
>> not sure how this would interact with the hypervisor, perhaps a call
>> to a new vmm script (for hypervisors that can do NIC hotplug).
>>
>> Perhaps an "unassign" call would make sense too (hot remove of IP Leases).
>>
>> What are your thoughts?
>>
>> Thanks
>>
>> Simon
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>
>