> when I create an instance via nova, can I specify which network the instance 
> should e attached to? For example, suppose that I have
> three VM in a compute node each of them is attached to a network 1,2,3, I 
> want to add the fourth one and specify that this VM
> should be attached in network 2. How can I do that?

This documentation should be of use in relation to creating a VM and
attaching it to a particular network,
http://docs.openstack.org/trunk/openstack-network/admin/content/advanceed_vm_creation.html.
It describes the various means of attaching a VM to a network/networks
using the 'nova' and 'quantum' command line tools.

> what is the difference between the compute node and the openstack controller 
> in the case of Nova? According to my understanding,
> the compute node is the physical or virtual machine where the virtual servers 
> are running, right?

That's it. In general the compute node(s) host the VMs while the
controller node hosts the nova/quantum/etc services. You can also have
a separate Network node hosting the quantum services. Appendix A in
the Networking Guide outlines a few deployment options.
http://docs.openstack.org/trunk/openstack-network/admin/content/app_demo.html

On 9 July 2013 16:31, othmane <douiriothm...@gmail.com> wrote:
> Hi all,
>
>
>
> Im newbie to openstack, my question is: when I create an instance via nova,
> can I specify which network the instance should e attached to? For example,
> suppose that I have three VM in a compute node each of them is attached to a
> network 1,2,3, I want to add the fourth one and specify that this VM should
> be attached in network 2. How can I do that?
>
>
>
> I have another question about understanding Openstack: what is the
> difference between the compute node and the openstack controller in the case
> of Nova? According to my understanding, the compute node is the physical or
> virtual machine where the virtual servers are running, right?
>
>
>
> Thinks a lot, any help would be appreciated.
>
>
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