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>From my experience, it is rather safe to extend allocation pools directly in the database. 
We also did allocation pool shrinking but always make sure there is no IP associated (or even assigned to a project) from out of the new range. 

Check the neutron MySQL table: ipallocationpools. 

Regards, 
Daniel 

----- Original Message -----

> From: "Aaron Rosen" <arosen at nicira.com>
> To: "Sam Lee" <lixq2000 at gmail.com>
> Cc: "openstack" <openstack at lists.openstack.org>
> Sent: Thursday, November 7, 2013 4:28:44 AM
> Subject: Re: [Openstack] Is there any way to extend the ip address of
> subnet?

> Hi Sam,

> Unfortunately we do not support updating the allocation-pools on
> subnets at this time. This is something that we should definitely
> fix though in neutron.

> Aaron

> On Wed, Nov 6, 2013 at 10:46 PM, Sam Lee < lixq2000 at gmail.com >
> wrote:

> > Hi All,
> 

> > I have created a subnet with 10 ips. But now I need more than ten
> > instances, is there any way to extend the subnet to add ip address?
> 
> > eg:
> 
> > I have ten ips as following:
> 
> > 172.16.2.210 ~ 172.16.2.220
> 

> > I want to add 20 more ips, and so the result will be
> 
> > 172.16.2.210 ~ 172.16.2.230
> 

> > I try subnet-update command and create a new subnet with the same
> > CIDR, but it doesn't work correctly.
> 

> > Thanks in advance.
> 
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