Answer by Pavel Chechetin for controller>neutron net-create ext-net --shared --router:external=True 503-{u'NeutronError': {u'message': u'Unable to create the network. No tenant network is available for allocation.', u'type': u'NoNetworkAvailable', u'detail': u''}} I refer Openstack Document install openstack icehouse on ubuntu 14.04. I do not know where the wrong. view the Log File: controller>cat /var/log/neutron/server.log 2014-05-09 15:34:47.144 989 INFO neutron.wsgi [-] (989) accepted ('10.0.0.251', 46917) 2014-05-09 15:34:47.147 989 INFO urllib3.connectionpool [-] Starting new HTTP connection (1): controller 2014-05-09 15:34:47.258 989 ERROR neutron.api.v2.resource [req-eeb01f6a-9b04-4c20-a118-9303ee7b794a None] create failed 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource Traceback (most recent call last): 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 87, in resource 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource result = method(request=request, **args) 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 419, in create 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource obj = obj_creator(request.context, **kwargs) 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/plugin.py", line 384, in create_network 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource segment = self.type_manager.allocate_tenant_segment(session) 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/managers.py", line 96, in allocate_tenant_segment 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource raise exc.NoNetworkAvailable() 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource NoNetworkAvailable: Unable to create the network. No tenant network is available for allocation. 2014-05-09 15:34:47.258 989 TRACE neutron.api.v2.resource 2014-05-09 15:34:47.264 989 INFO neutron.wsgi [req-eeb01f6a-9b04-4c20-a118-9303ee7b794a None] 10.0.0.251 - - [09/May/2014 15:34:47] "POST /v2.0/networks.json HTTP/1.1" 503 360 0.118819 controller>ps aux | grep neutron neutron 2587 0.2 4.0 211936 52140 ? Ss 17:06 0:07 /usr/bin/python /usr/bin/neutron-server --config-file /etc/neutron/neutron.conf --log-file /var/log/neutron/server.log --config-file /etc/neutron/plugins/ml2/ml2_conf.ini root 3356 0.0 0.0 11744 924 pts/1 S+ 17:57 0:00 grep --color=auto neutron controller neutron.conf file: [DEFAULT] verbose = True state_path = /var/lib/neutron lock_path = $state_path/lock core_plugin = ml2 service_plugins = router allow_overlapping_ips = True notify_nova_on_port_status_changes = True notify_nova_on_port_data_changes = True nova_url = http://controller:8774/v2 nova_admin_username = nova nova_admin_tenant_id = 36bf9ca9fbee42a5abad0d0ad2a69e02 nova_admin_password = nova nova_admin_auth_url = http://controller:35357/v2.0 auth_strategy = keystone rpc_backend = neutron.openstack.common.rpc.impl_kombu rabbit_host = controller rabbit_password = guest rabbit_userid = guest notification_driver = neutron.openstack.common.notifier.rpc_notifier [quotas] [agent] root_helper = sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf [keystone_authtoken] auth_uri = http://controller:5000 auth_host = controller auth_port = 35357 ... (more)

It looks like you didn't restart some services after configuration changes and some changes hasn't been applied yet. Restart services or even restart the machine (if it's possible).