Public bug reported:

We recently run out IP address in the subnet used for our instances and
we had to extend out subnet from /24 to /23.

We edited /etc/nova/nova.conf, restared nova-network using 
/etc/init.d/nova-network restart.
"ifconfig bf100" was showing correct (new) netmask so was "nova-manage network 
list"

When new instances were about to use new range they failed to get IPs:

On compute node:
2013-02-27 10:46:38 ERROR nova.compute.manager [req-xxxx xxxx xxxx] [instance: 
xxxx] Instance failed network setup

And corresponding on our controller:
2013-02-27 10:46:38 DEBUG nova.network.manager [req-xxxx xxxx xxxx] [instance: 
xxxx] networks retrieved for instance: |[<nova.db.sqlalchemy.models.Network 
object at 0x4997850>]| from (pid=2687) allocate_for_instance 
/usr/lib/python2.7/dist-packages/nova/network/manager.py:982
2013-02-27 10:46:38 ERROR nova.openstack.common.rpc.amqp [-] Exception during 
message handling
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp Traceback (most recent 
call last):
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 275, 
in _process_data
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     rval = 
self.proxy.dispatch(ctxt, version, method, **args)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", 
line 145, in dispatch
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     return 
getattr(proxyobj, method)(ctxt, **kwargs)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 257, in wrapped
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     return func(self, 
context, *args, **kwargs)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 320, in 
allocate_for_instance
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     **kwargs)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 257, in wrapped
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     return func(self, 
context, *args, **kwargs)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 986, in 
allocate_for_instance
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     
requested_networks=requested_networks)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 213, in 
_allocate_fixed_ips
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     vpn=vpn, 
address=address)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 1265, in 
allocate_fixed_ip
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     
instance_ref['uuid'])
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/db/api.py", line 442, in 
fixed_ip_associate_pool
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     instance_uuid, 
host)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 111, in 
wrapper
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     return f(*args, 
**kwargs)
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 1089, in 
fixed_ip_associate_pool
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp     raise 
exception.NoMoreFixedIps()
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp NoMoreFixedIps: Zero 
fixed ips available.
2013-02-27 10:46:38 TRACE nova.openstack.common.rpc.amqp 
2013-02-27 10:46:38 ERROR nova.openstack.common.rpc.common [-] Returning 
exception Zero fixed ips available. to caller

After some investigation we realised that fixed_ips table in nova DB only had 
IPs from the old range. We added new IPs using:
INSERT INTO fixed_ips (created_at, deleted, allocated, leased, reserved, 
network_id, address) VALUES (CURDATE(), 0,0,0,0, 1, "xx.xx.xx.xx");
which allowed our instances to get IPs from new range.

On compute node we are running:
ii  nova-common                      2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - common files
ii  nova-compute                     2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - compute node
ii  nova-compute-kvm                 2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - compute node (KVM)
ii  python-nova                      2012.2-0ubuntu5~cloud0                     
   OpenStack Compute Python libraries
ii  python-novaclient                1:2.9.0-0ubuntu1~cloud0                    
   client library for OpenStack Compute API

and on the controller:
ii  nova-api                         2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - API frontend
ii  nova-cert                        2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - certificate management
ii  nova-common                      2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - common files
ii  nova-doc                         2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - documentation
ii  nova-network                     2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - Network manager
ii  nova-objectstore                 2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - object store
ii  nova-scheduler                   2012.2-0ubuntu5~cloud0                     
   OpenStack Compute - virtual machine scheduler
ii  python-nova                      2012.2-0ubuntu5~cloud0                     
   OpenStack Compute Python libraries
ii  python-novaclient                1:2.9.0-0ubuntu1~cloud0                    
   client library for OpenStack Compute API

Both running:
Description:    Ubuntu 12.04.2 LTS
Release:        12.04

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1134604

Title:
  New IPs not available after subnet changes

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