####################################################################################################################################

Horizon GUI error:
Error: Failed to launch instance "test3": Please try again later [Error: No valid host was found. Exceeded max scheduling attempts 3 for instance deabc5e1-fa3f-4ee9-adb4-9ee6e62d5352. Last exception: [u'Traceback (most recent call last):\n', u' File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2014, in do_]. 

####################################################################################################################################

server.log:
2014-11-13 00:07:22.345 5212 WARNING neutron.plugins.ml2.managers [req-9c258074-fd1f-4ef5-bafd-2f68d1d9bb02 None] Failed to bind port 5d85ee56-ce4c-4cc8-a086-a191c98c4aec on host openstack-web-j005.lv1.xxxxxxx.com

####################################################################################################################################

server.log:
2014-11-13 00:07:22.441 5212 DEBUG neutron.common.rpc [req-9c258074-fd1f-4ef5-bafd-2f68d1d9bb02 None] neutron.api.rpc.agentnotifiers.dhcp_rpc_agent_api.DhcpAgentNotifyAPI method cast called with arguments (<neutron.context.Context object at 0x55c81d0>, {
  'args':{
    'payload':{
      'port':{
        'status':u'DOWN',
        'binding:host_id':u'openstack-web-j005.lv1.xxxxxxx.com',
        'allowed_address_pairs':[

        ],
        'extra_dhcp_opts':[

        ],
        'device_owner':        u'compute:nova',
        'binding:profile':{

        },
        'fixed_ips':[
          {
            'subnet_id':u'b96c207c-c8c6-4ac9-90b1-42aa8706010a',
            'ip_address':u'10.96.112.202'
          }
        ],
        'id':u'5d85ee56-ce4c-4cc8-a086-a191c98c4aec',
        'security_groups':[
          u'07c5ca3d-def1-437f-8450-ae689f5ff546'
        ],
        'device_id':u'2b2dcd4c-4f59-47e3-ac6f-2e609caaa6b6',
        'name':u'',
        'admin_state_up':True,
        'network_id':u'b157cc4a-09ff-4f2f-a45e-df753681b90e',
        'tenant_id':u'e728f847c29e4f80b319eeb4deb777e5',
        'binding:vif_details':{

        },
        'binding:vnic_type':'normal',
        'binding:vif_type':'binding_failed',
        'mac_address':        u'fa:16:3e:        f8:90:b6'
      }
    }
  },
  'namespace':None,
  'method':'port_create_end'
}){
  'topic':u'dhcp_agent.openstack-web-j005.lv1.xxxxxxx.com'
} wrapper /usr/lib/python2.7/site-packages/neutron/common/log.py:33

####################################################################################################################################

nova-compute.log:
2014-11-13 00:12:48.214 4924 DEBUG neutronclient.client [-] RESP:200 {'date': 'Thu, 13 Nov 2014 05:12:48 GMT', 'content-length': '727', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-cbfa1903-f03e-41f4-9504-43fc6f5d4bd6'} 
{
  'date':'Thu, 13 Nov 2014 05:12:48 GMT',
  'content-length':'727',
  'content-type':'application/json; charset=UTF-8',
  'x-openstack-request-id':'req-cbfa1903-f03e-41f4-9504-43fc6f5d4bd6'
}
{
  "ports":[
    {
      "status":"DOWN",
      "binding:host_id":"openstack-web-j005.lv1.xxxxxxx.com",
      "allowed_address_pairs":[

      ],
      "extra_dhcp_opts":[

      ],
      "device_owner":"compute:nova",
      "binding:profile":{

      },
      "fixed_ips":[
        {
          "subnet_id":"b96c207c-c8c6-4ac9-90b1-42aa8706010a",
          "ip_address":"10.96.112.202"
        }
      ],
      "id":"5d85ee56-ce4c-4cc8-a086-a191c98c4aec",
      "security_groups":[
        "07c5ca3d-def1-437f-8450-ae689f5ff546"
      ],
      "device_id":"2b2dcd4c-4f59-47e3-ac6f-2e609caaa6b6",
      "name":"",
      "admin_state_up":true,
      "network_id":"b157cc4a-09ff-4f2f-a45e-df753681b90e",
      "tenant_id":"e728f847c29e4f80b319eeb4deb777e5",
      "binding:vif_details":{

      },
      "binding:vnic_type":"normal",
      "binding:vif_type":"binding_failed",
      "mac_address":"fa:16:3e:f8:90:b6"
    }
  ]
}

nova-compute.log:
2014-11-13 00:12:48.436 4924 DEBUG nova.network.base_api [-] Updating cache with info: [VIF({
  'profile':{

  },
  'ovs_interfaceid':None,
  'network':Network(  {
    'bridge':None,
    'subnets':[
      Subnet(      {
        'ips':[
          FixedIP(          {
            'meta':{

            },
            'version':4,
            'type':'fixed',
            'floating_ips':[

            ],
            'address':u'10.96.112.202'
          }          )
        ],
        'version':4,
        'meta':{

        },
        'dns':[

        ],
        'routes':[

        ],
        'cidr':u'10.96.112.0/20',
        'gateway':IP(        {
          'meta':{

          },
          'version':None,
          'type':'gateway',
          'address':None
        }        )
      }      )
    ],
    'meta':{
      'injected':False,
      'tenant_id':u'719476cecbdd4601891aad640a5dff68'
    },
    'id':u'b157cc4a-09ff-4f2f-a45e-df753681b90e',
    'label':u'VLAN 209'
  }  ),
  'devname':u'tap5d85ee56-ce',
  'vnic_type':u'normal',
  'qbh_params':None,
  'meta':{

  },
  'details':{

  },
  'address':  u'fa:16:3e:  f8:90:b6',
  'active':False,
  'type':u'binding_failed',
  'id':u'5d85ee56-ce4c-4cc8-a086-a191c98c4aec',
  'qbg_params':None
})] update_instance_cache_with_nw_info /usr/lib/python2.7/site-packages/nova/network/base_api.py:40

####################################################################################################################################

nova-compute.log:
2014-11-13 00:18:54.424 4924 DEBUG nova.virt.disk.api [req-a19856e5-7f48-4199-9f71-c66d64729074 None] Unable to mount image /var/lib/nova/instances/deabc5e1-fa3f-4ee9-adb4-9ee6e62d5352/disk with error Error mounting /var/lib/nova/instances/deabc5e1-fa3f-4ee9-adb4-9ee6e62d5352/disk with libguestfs (mount_options: /dev/sda on / (options: ''): mount: /dev/sda is write-protected, mounting read-only
2014-11-13 00:18:54.473 4924 ERROR nova.compute.manager [req-a19856e5-7f48-4199-9f71-c66d64729074 None] [instance: deabc5e1-fa3f-4ee9-adb4-9ee6e62d5352] Instance failed to spawn
2014-11-13 00:18:54.917 4810 WARNING nova.scheduler.driver [req-a19856e5-7f48-4199-9f71-c66d64729074 None] [instance: deabc5e1-fa3f-4ee9-adb4-9ee6e62d5352] Setting instance to ERROR state.

####################################################################################################################################

/etc/neutron/plugins/ml2/ml2_conf.ini:
[ml2]
type_drivers = vlan,vxlan
tenant_network_types = vlan,vxlan
mechanism_drivers = openvswitch

[ml2_type_flat]

[ml2_type_vlan]
network_vlan_ranges = physnet1:1:4094
bridge_mappings = physnet1:br-eno2

[ml2_type_gre]

[ml2_type_vxlan]
vni_ranges = 10000:19999
vxlan_group = 239.1.1.1

[securitygroup]
enable_security_group = True

####################################################################################################################################

/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini:
[ovs]
enable_tunneling = True
integration_bridge = br-int
tunnel_bridge = br-tun
local_ip =10.96.121.186

[agent]
polling_interval = 2
tunnel_types =vxlan
vxlan_udp_port =4789
l2_population = False
arp_responder = False

[securitygroup]
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver