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[Roman Podoliaka <rpodolyaka+bugs@xxxxxxxxxxxx>]

Public bug reported:

When a host is rebooted and resume_guests_state_on_host_boot is set to True, it may happen that nova-compute starts before Neutron L2 agent finishes its initialization, which includes creation of an OVS integration bridge, and thus we'll see the following error when creating an ovs vif port:
    
 2016-01-05 02:57:57.970 11932 ERROR nova.network.linux_net [req-e5b5ba37-fff7-4b41-9dda-00c2c54a8e22 - - - - -] Unable to execute ['ovs-vsctl', '--timeout=120', '--', '--if-exists', 'del-port', u'qvob2efeceb-e4', '--', 'add-port', u'br-int', u'qvob2efeceb-e4', '--', 'set', 'Interface', u'qvob2efeceb-e4', u'external-ids:iface-id=b2efeceb-e46f-41f5-a1b2-add7f5dd7a80', 'external-ids:iface-status=active', u'external-ids:attached-mac=fa:16:3e:34:91:87', 'external-ids:vm-uuid=50118e0e-e104-4cc0-b154-b0dcdaef0494']. Exception: Unexpected error while running command.
Command: sudo nova-rootwrap /etc/nova/rootwrap.conf ovs-vsctl --timeout=120 -- --if-exists del-port qvob2efeceb-e4 -- add-port br-int qvob2efeceb-e4 -- set Interface qvob2efeceb-e4 external-ids:iface-id=b2efeceb-e46f-41f5-a1b2-add7f5dd7a80 external-ids:iface-status=active external-ids:attached-mac=fa:16:3e:34:91:87 external-ids:vm-uuid=50118e0e-e104-4cc0-b154-b0dcdaef0494
Exit code: 1
Stdout: u''
Stderr: u'ovs-vsctl: no bridge named br-int\n'
    
An instance will be booted successfully, but there will be no network connectivity inside the VM.

** Affects: nova
     Importance: Undecided
     Assignee: Roman Podoliaka (rpodolyaka)
         Status: In Progress

** Changed in: nova
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1532890

Title:
  No network connectivity inside VMs after host reboot

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  When a host is rebooted and resume_guests_state_on_host_boot is set to True, it may happen that nova-compute starts before Neutron L2 agent finishes its initialization, which includes creation of an OVS integration bridge, and thus we'll see the following error when creating an ovs vif port:
      
   2016-01-05 02:57:57.970 11932 ERROR nova.network.linux_net [req-e5b5ba37-fff7-4b41-9dda-00c2c54a8e22 - - - - -] Unable to execute ['ovs-vsctl', '--timeout=120', '--', '--if-exists', 'del-port', u'qvob2efeceb-e4', '--', 'add-port', u'br-int', u'qvob2efeceb-e4', '--', 'set', 'Interface', u'qvob2efeceb-e4', u'external-ids:iface-id=b2efeceb-e46f-41f5-a1b2-add7f5dd7a80', 'external-ids:iface-status=active', u'external-ids:attached-mac=fa:16:3e:34:91:87', 'external-ids:vm-uuid=50118e0e-e104-4cc0-b154-b0dcdaef0494']. Exception: Unexpected error while running command.
  Command: sudo nova-rootwrap /etc/nova/rootwrap.conf ovs-vsctl --timeout=120 -- --if-exists del-port qvob2efeceb-e4 -- add-port br-int qvob2efeceb-e4 -- set Interface qvob2efeceb-e4 external-ids:iface-id=b2efeceb-e46f-41f5-a1b2-add7f5dd7a80 external-ids:iface-status=active external-ids:attached-mac=fa:16:3e:34:91:87 external-ids:vm-uuid=50118e0e-e104-4cc0-b154-b0dcdaef0494
  Exit code: 1
  Stdout: u''
  Stderr: u'ovs-vsctl: no bridge named br-int\n'
      
  An instance will be booted successfully, but there will be no network connectivity inside the VM.

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