Open Stack

Thanks a lot Aaron and Robert. That worked like a charm!

I set the 'allow_overlapping_ips = True' in quantum.conf and rebooted the
stack(wish there was an easy cli to restart individual projects/services or
may be I dont know if one exists).

And while still in a Flat network setup I could create the duplicate
networks.

root at openstack:~# nova list
+--------------------------------------+------------------+--------+-------------------------------------------+
| ID                                   | Name             | Status |
Networks                                  |
+--------------------------------------+------------------+--------+-------------------------------------------+
| f4762c79-e322-4ec5-8f62-ab2cbe156363 | A1 | ACTIVE | labnet=10.5.12.24;
private1=192.168.168.4 |
| 4bac873f-e081-460b-8bf8-95f8719081c7  | A2 | ACTIVE | labnet=10.5.12.22;
private1=192.168.168.3 |
| d7e47567-81eb-48a3-a2ca-63e1b5df8a08 | B1 | ACTIVE | labnet=10.5.12.23;
private2=192.168.168.3 |
+--------------------------------------+------------------+--------+-------------------------------------------+
root at openstack:~#

Instances A1 and* *A2 can communicate over the private network while B1
cannot talk to A2 as desired and it doesnt complain about conflicting IP
either.

I am using the
quantum.plugins.openvswitch.ovs_quantum_plugin.OVSQuantumPluginV2 plugin.

Regards,
Balu




On Thu, Jan 17, 2013 at 2:17 PM, Aaron Rosen <arosen at nicira.com> wrote:

> Hi,
>
> Yup this is definitely possible. The reason why this isn't set by default
> is that some distros don't ship kernels that build with CONFIG_NET_NS=y or
> their iproute2 package is to outdated to support linux namespaces.  Also,
> until recently nova's metadata service didn't support overlapping ips. If
> you are running ubuntu 12.04 you should be able to set:
>
> Q_ALLOW_OVERLAPPING_IP=True
>
> in your localrc to enable this.
>
> or edit your quantum.conf here and restart quantum to enable overlapping
> ips.
>
> # Enable or disable overlapping IPs for subnets
> # Attention: the following parameter MUST be set to False if Quantum is
> # being used in conjunction with nova security groups and/or metadata
> service.
> # allow_overlapping_ips = False
>
>
> Aaron
>
> p.s: I don't think this will work in a flat network setup though since
> there is no way to isolate that. What plugin are you using?
> > I have the following networks in a flat network setup.
>
>
> On Thu, Jan 17, 2013 at 2:52 AM, Balamurugan V G <balamuruganvg at gmail.com>wrote:
>
>> Hi,
>>
>> Is there a way to create a duplicate network/subnet for tenant in
>> quantum. Basically for a tenant, I want to have some instances(GroupA)
>> share a subnet and another set of instances(GroupB) share the
>> same(duplicate) subnet but GroupA and GroupB should be isolated. I have
>> labnet which is the flat network to which one instance from each group is
>> assigned for external connectivity. Then I want to have two private
>> networks private1 and private2 both sharing the same subnet but I was to
>> assign some instances to private1 and some in private2.
>>
>> I have the following networks in a flat network setup.
>>
>> root at openstack:~# quantum subnet-list
>>
>> +--------------------------------------+------+------------------+------------------------------------------------------+
>> | id                                   | name | cidr             |
>> allocation_pools                                     |
>>
>> +--------------------------------------+------+------------------+------------------------------------------------------+
>> | abb62a74-ad15-452c-857f-ee0a1b388ede |      | 192.168.168.0/24 |
>> {"start": "192.168.168.2", "end": "192.168.168.254"} |
>> | eedc0c12-c3ed-42ce-a860-692e766087a2 |      | 10.5.12.0/24     |
>> {"start": "10.5.12.21", "end": "10.5.12.25"}         |
>>
>> +--------------------------------------+------+------------------+------------------------------------------------------+
>> root at openstack:~#
>>
>>
>> Now, the following gets denied.
>>
>> root at openstack:~# quantum subnet-create --tenant-id
>> 7cda178971e84c5194c8531bf4f229d7  private2 192.168.168.0/24
>> Invalid input for operation: Requested subnet with cidr: 192.168.168.0/24for network: 64ec75d6-0c6f-44e1-a268-b573324c4160 overlaps with another
>> subnet.
>> root at openstack:~#
>>
>> I understand that a duplicate network with a tenant is not a common
>> scenario and perhaps by design its not allowed.
>>
>> But there could be cases like I mentioned.
>>
>> Strangely, I am not allowed to create the duplicate network even across
>> tenants. Atleast this should be allowed.
>>
>> BTW, I am running a single node Devstack.
>>
>> Regards,
>> Balu
>>
>> _______________________________________________
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>>
>
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