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[Attila Fazekas <afazekas@xxxxxxxxxx>]

** Also affects: neutron
   Importance: Undecided
       Status: New

** No longer affects: neutron

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https://bugs.launchpad.net/bugs/1251784

Title:
  nova+neutron scheduling error: Connection to neutron failed: Maximum
  attempts reached

Status in OpenStack Compute (Nova):
  Fix Released
Status in tripleo - openstack on openstack:
  Fix Released

Bug description:
  VMs are failing to schedule with the following error

  2013-11-15 20:50:21.405 ERROR nova.scheduler.filter_scheduler [req-
  d2c26348-53e6-448a-8975-4f22f4e89782 demo demo] [instance: c8069c13
  -593f-48fb-aae9-198961097eb2] Error from last host: devstack-precise-
  hpcloud-az3-662002 (node devstack-precise-hpcloud-az3-662002):
  [u'Traceback (most recent call last):\n', u'  File
  "/opt/stack/new/nova/nova/compute/manager.py", line 1030, in
  _build_instance\n    set_access_ip=set_access_ip)\n', u'  File
  "/opt/stack/new/nova/nova/compute/manager.py", line 1439, in _spawn\n
  LOG.exception(_(\'Instance failed to spawn\'), instance=instance)\n',
  u'  File "/opt/stack/new/nova/nova/compute/manager.py", line 1436, in
  _spawn\n    block_device_info)\n', u'  File
  "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 2100, in
  spawn\n    admin_pass=admin_password)\n', u'  File
  "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 2451, in
  _create_image\n    content=files, extra_md=extra_md,
  network_info=network_info)\n', u'  File
  "/opt/stack/new/nova/nova/api/metadata/base.py", line 165, in
  __init__\n
  ec2utils.get_ip_info_for_instance_from_nw_info(network_info)\n', u'
  File "/opt/stack/new/nova/nova/api/ec2/ec2utils.py", line 149, in
  get_ip_info_for_instance_from_nw_info\n    fixed_ips =
  nw_info.fixed_ips()\n', u'  File
  "/opt/stack/new/nova/nova/network/model.py", line 368, in
  _sync_wrapper\n    self.wait()\n', u'  File
  "/opt/stack/new/nova/nova/network/model.py", line 400, in wait\n
  self[:] = self._gt.wait()\n', u'  File "/usr/local/lib/python2.7/dist-
  packages/eventlet/greenthread.py", line 168, in wait\n    return
  self._exit_event.wait()\n', u'  File "/usr/local/lib/python2.7/dist-
  packages/eventlet/event.py", line 120, in wait\n
  current.throw(*self._exc)\n', u'  File "/usr/local/lib/python2.7/dist-
  packages/eventlet/greenthread.py", line 194, in main\n    result =
  function(*args, **kwargs)\n', u'  File
  "/opt/stack/new/nova/nova/compute/manager.py", line 1220, in
  _allocate_network_async\n    dhcp_options=dhcp_options)\n', u'  File
  "/opt/stack/new/nova/nova/network/neutronv2/api.py", line 359, in
  allocate_for_instance\n    nw_info =
  self._get_instance_nw_info(context, instance, networks=nets)\n', u'
  File "/opt/stack/new/nova/nova/network/api.py", line 49, in wrapper\n
  res = f(self, context, *args, **kwargs)\n', u'  File
  "/opt/stack/new/nova/nova/network/neutronv2/api.py", line 458, in
  _get_instance_nw_info\n    nw_info =
  self._build_network_info_model(context, instance, networks)\n', u'
  File "/opt/stack/new/nova/nova/network/neutronv2/api.py", line 1022,
  in _build_network_info_model\n    subnets =
  self._nw_info_get_subnets(context, port, network_IPs)\n', u'  File
  "/opt/stack/new/nova/nova/network/neutronv2/api.py", line 924, in
  _nw_info_get_subnets\n    subnets =
  self._get_subnets_from_port(context, port)\n', u'  File
  "/opt/stack/new/nova/nova/network/neutronv2/api.py", line 1066, in
  _get_subnets_from_port\n    data =
  neutronv2.get_client(context).list_ports(**search_opts)\n', u'  File
  "/opt/stack/new/python-neutronclient/neutronclient/v2_0/client.py",
  line 111, in with_params\n    ret = self.function(instance, *args,
  **kwargs)\n', u'  File "/opt/stack/new/python-
  neutronclient/neutronclient/v2_0/client.py", line 306, in list_ports\n
  **_params)\n', u'  File "/opt/stack/new/python-
  neutronclient/neutronclient/v2_0/client.py", line 1250, in list\n
  for r in self._pagination(collection, path, **params):\n', u'  File
  "/opt/stack/new/python-neutronclient/neutronclient/v2_0/client.py",
  line 1263, in _pagination\n    res = self.get(path, params=params)\n',
  u'  File "/opt/stack/new/python-
  neutronclient/neutronclient/v2_0/client.py", line 1236, in get\n
  headers=headers, params=params)\n', u'  File "/opt/stack/new/python-
  neutronclient/neutronclient/v2_0/client.py", line 1228, in
  retry_request\n    raise exceptions.ConnectionFailed(reason=_("Maximum
  attempts reached"))\n', u'ConnectionFailed: Connection to neutron
  failed: Maximum attempts reached\n']

  
  Connection to neutron failed: Maximum attempts reached

  http://logs.openstack.org/96/56496/1/gate/gate-tempest-devstack-vm-
  neutron-
  isolated/8df6c6c/logs/screen-n-sch.txt.gz#_2013-11-15_20_50_21_405

  
  logstash query: "Connection to neutron failed: Maximum attempts reached"  AND filename:"logs/screen-n-sch.txt"

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