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[Launchpad Bug Tracker <1360115@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: 1.2.7 compute icehouse libvirt nova nova-compute nwfilter qemu
-- 
nova-compute doesn't work well with libvirt 1.2.7 and qemu 2.1.0
https://bugs.launchpad.net/bugs/1360115
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