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Hi Jay,

Thanks for your answer

BTW:
About ”unecessarly complex” I do think more or less as you BUT
It’s worth to mention that somebody in the list correctly answered: “we can have many networks, and the subnets within network can have overlap IPs.”

Bye

Marco

From: Jay Pipes [mailto:jaypipes at gmail.com]
Sent: den 12 oktober 2013 16:55
To: Marco Fornaro
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] Tricky questions - 1/3 Quantum Network Object

I've wondered exactly the same question -- or, put another way, why have the concept of a "subnet" at all; why not just have one or more network objects that have either a CIDR or set of IP ranges set on them, along with certain flags like "shared". The way the API is right now seems needlessly complex.
IMO, a tenant should be able to create a router for their networking, create one or more networks for their private addresses, configure the router's gateway to speak with the shared "public" network, and be done with it. The sheer number of steps that is currently necessary to make in order to set up a simple private network for a tenant's VMs is cumbersome and smells of "implementation leaking into the API".

-jay

On Thu, Oct 10, 2013 at 10:10 AM, Marco Fornaro <Marco.Fornaro at huawei.com<mailto:Marco.Fornaro at huawei.com>> wrote:
Hi All,

Some Tricky questions I ask help for (email 1 of 3):


Quantum Network object
In the “openstack networking guide”->”Using Openstack compute with Openstack”->” Advanced VM creation” (http://docs.openstack.org/grizzly/openstack-network/admin/content/advanceed_vm_creation.html) there are example boot a VM on one or more NETWORKs (meaning the quantum Network object):
nova boot --image <img> --flavor <flavor> \
--nic net-id=<net1-id> --nic net-id=<net2-id> <vm-name>

BUT if you look at the description of the network object in the API abstraction it looks like a collection of subnets (meaning the quantum object), so basically a collection of IP Addresses like 192.168.100.0/24<http://192.168.100.0/24>

SO (first question): what happens in the network where I boot the VM has more than a subnet?...I suppose the VM should have a nic for EACH subnet of the network!

THEN (second question): why do I need a network object? Shouldn’t it be more practical to have just the subnet object?..why do I need to create a Network if it’s just a collection of subnets?

Thanks in advance for any help

Best Regards

Marco




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