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[Henry Gessau <HenryG@xxxxxxxxxx>]

*** This bug is a duplicate of bug 1550434 ***
    https://bugs.launchpad.net/bugs/1550434

** This bug has been marked a duplicate of bug 1550434
   vpnaas alembic migration fails for upgrade liberty

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https://bugs.launchpad.net/bugs/1511982

Title:
  Unable to upgrade the DB from kilo to liberty with VPNaaS

Status in neutron:
  Expired

Bug description:
  i'm trying to upgrade neutron from Kilo to Liberty with VPNaaS enabled.
  While 

  neutron-db-manage --config-file /etc/neutron/neutron.conf  --config-
  file /etc/neutron/plugins/ml2/ml2_conf.ini upgrade liberty

  I get this error.

  Traceback (most recent call last):
    File "/usr/bin/neutron-db-manage", line 10, in <module>
      sys.exit(main())
    File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 554, in main
      CONF.command.func(config, CONF.command.name)
    File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 188, in do_upgrade
      run_sanity_checks(config, revision)
    File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 541, in run_sanity_checks
      script_dir.run_env()
    File "/usr/lib/python2.7/dist-packages/alembic/script/base.py", line 397, in run_env
      util.load_python_file(self.dir, 'env.py')
    File "/usr/lib/python2.7/dist-packages/alembic/util/pyfiles.py", line 81, in load_python_file
      module = load_module_py(module_id, path)
    File "/usr/lib/python2.7/dist-packages/alembic/util/compat.py", line 79, in load_module_py
      mod = imp.load_source(module_id, path, fp)
    File "/usr/lib/python2.7/dist-packages/neutron_vpnaas/db/migration/alembic_migrations/env.py", line 87, in <module>
      run_migrations_online()
    File "/usr/lib/python2.7/dist-packages/neutron_vpnaas/db/migration/alembic_migrations/env.py", line 78, in run_migrations_online
      context.run_migrations()
    File "<string>", line 8, in run_migrations
    File "/usr/lib/python2.7/dist-packages/alembic/runtime/environment.py", line 797, in run_migrations
      self.get_context().run_migrations(**kw)
    File "/usr/lib/python2.7/dist-packages/alembic/runtime/migration.py", line 303, in run_migrations
      for step in self._migrations_fn(heads, self):
    File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 532, in check_sanity
      revision, rev, implicit_base=True):
    File "/usr/lib/python2.7/dist-packages/alembic/script/revision.py", line 664, in _iterate_revisions
      raise RangeNotAncestorError(lower, upper)
  alembic.script.revision.RangeNotAncestorError: Revision (u'2c82e782d734',) is not an ancestor of revision 24f28869838b

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