记一次OpenStack报错：No tenant network is available for allocation

创建selfservice网络时报错：

[root@controller ~]# openstack network create selfservice
Error while executing command: HttpException: Unknown error, {"NeutronError": {"message": "Unable to create the network. No tenant network is available for allocation.", "type": "NoNetworkAvailable", "detail": ""}}

在dashboard上创建网络报同样错误：

查看neutron日志：

[root@controller ~]# cat /var/log/neutron/server.log
2018-06-11 11:09:00.505 5569 ERROR neutron.pecan_wsgi.hooks.translation     raise exc.NoNetworkAvailable()
2018-06-11 11:09:00.505 5569 ERROR neutron.pecan_wsgi.hooks.translation NoNetworkAvailable: Unable to create the network. No tenant network is available for allocation.
2018-06-11 11:09:00.505 5569 ERROR neutron.pecan_wsgi.hooks.translation

google查找原因：
https://access.redhat.com/solutions/756453，这里提到 tunnel_id_ranges = 1:1000。
解决问题：

[root@controller ~]# vim /etc/neutron/plugins/ml2/ml2_conf.ini
[ml2_type_vxlan]

#

vni_ranges = 1:1000   #在配置文件中增加vni_ranges = 1:1000