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[ZongKai LI <lzklibj@xxxxxxxxxx>]

Public bug reported:

On a 1+2 env, router has external network attached.
Use follow steps to migrate from non-dvr to dvr:
1) modify related config files.
2) restart related services.
3) run command "neutron router-update --distributed=True ROUTER".

Now, there's no snat-* netns create on controller node.
As a workaround, restart neutron-l3-agent on controller node will work.

And in l3-agent.log, we can find:
2015-02-28 01:26:21.377 5283 ERROR neutron.agent.l3.agent [-] 'LegacyRouter' object has no attribute 'dist_fip_count'
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent Traceback (most recent call last):
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent   File "/usr/lib/python2.7/site-packages/neutron/common/utils.py", line 342, in call
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent     return func(*args, **kwargs)
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/l3/agent.py", line 592, in process_router
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent     self.scan_fip_ports(ri)
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/l3/dvr.py", line 128, in scan_fip_ports
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent     if not ri.router.get('distributed') or ri.dist_fip_count is not None:
2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent AttributeError: 'LegacyRouter' object has no attribute 'dist_fip_count'

It seems current code is not ready to migrate LegacyRouter to DvrRouter.

** Affects: neutron
     Importance: Undecided
     Assignee: ZongKai LI (lzklibj)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => ZongKai LI (lzklibj)

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https://bugs.launchpad.net/bugs/1428713

Title:
  migrate non-dvr to dvr case, snat netns not created

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  On a 1+2 env, router has external network attached.
  Use follow steps to migrate from non-dvr to dvr:
  1) modify related config files.
  2) restart related services.
  3) run command "neutron router-update --distributed=True ROUTER".

  Now, there's no snat-* netns create on controller node.
  As a workaround, restart neutron-l3-agent on controller node will work.

  And in l3-agent.log, we can find:
  2015-02-28 01:26:21.377 5283 ERROR neutron.agent.l3.agent [-] 'LegacyRouter' object has no attribute 'dist_fip_count'
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent Traceback (most recent call last):
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent   File "/usr/lib/python2.7/site-packages/neutron/common/utils.py", line 342, in call
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent     return func(*args, **kwargs)
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/l3/agent.py", line 592, in process_router
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent     self.scan_fip_ports(ri)
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/l3/dvr.py", line 128, in scan_fip_ports
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent     if not ri.router.get('distributed') or ri.dist_fip_count is not None:
  2015-02-28 01:26:21.377 5283 TRACE neutron.agent.l3.agent AttributeError: 'LegacyRouter' object has no attribute 'dist_fip_count'

  It seems current code is not ready to migrate LegacyRouter to
  DvrRouter.

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