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[Alan Pevec <1360119@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/icehouse
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1360119

Title:
  Nova tries to re-define an existing nwfilter with the same name but
  different uuid

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) icehouse series:
  New

Bug description:
  Hello,

      I have successfully compiled libvirt 1.2.7 and qemu 2.1.0 but had
  some troubles with nova-compute. It appears like libvirt is throwing
  back an error if a nwfilter is already present.

  Here is my debug log:
  2014-08-22 08:22:25.032 15354 DEBUG nova.virt.libvirt.firewall [req-0959ec86-3939-4e38-9505-48494b44a9fa f1d21892f9a0413c9437b6771e4290ce 9cad53a0432d4164837b8c0b35d91307] nwfilterDefineXML may have failed with (operation failed: filter 'nova-nodhcp' already exists with uuid 59970732-ca52-4521-ba0c-d001049d8460)! _define_filter /usr/lib/python2.6/site-packages/nova/virt/libvirt/firewall.py:239
  2014-08-22 08:22:25.033 15354 DEBUG nova.virt.libvirt.firewall [req-0959ec86-3939-4e38-9505-48494b44a9fa f1d21892f9a0413c9437b6771e4290ce 9cad53a0432d4164837b8c0b35d91307] nwfilterDefineXML may have failed with (operation failed: filter 'nova-base' already exists with uuid b5aa80ad-ea4a-4633-84ac-442c9270a143)! _define_filter /usr/lib/python2.6/site-packages/nova/virt/libvirt/firewall.py:239
  2014-08-22 08:22:25.034 15354 DEBUG nova.virt.libvirt.firewall [req-0959ec86-3939-4e38-9505-48494b44a9fa f1d21892f9a0413c9437b6771e4290ce 9cad53a0432d4164837b8c0b35d91307] nwfilterDefineXML may have failed with (operation failed: filter 'nova-vpn' already exists with uuid b61eb708-a9a5-4a16-8787-cdc58310babc)! _define_filter /usr/lib/python2.6/site-packages/nova/virt/libvirt/firewall.py:239

  Here is the original function:
      def _define_filter(self, xml):
          if callable(xml):
              xml = xml()
          self._conn.nwfilterDefineXML(xml)

  And here is the "patched" function":
      def _define_filter(self, xml):
          if callable(xml):
              xml = xml()
          try:
              self._conn.nwfilterDefineXML(xml)
          except Exception, e:
              LOG.debug(_('nwfilterDefineXML may have failed with (%s)!'), e)

  I'm not a python expert but I think that patch could be adapted to
  raise an error ONLY if the nwfilter rule doesn't already exist.

  Dave

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