I am trying to create cluster using magnum without internet access. But I got the following error:

"ERROR magnum.drivers.heat.template_def [req-8b4d63f6-1839-4c24-893f-e299efeb9fb8 - - - - -] HTTPSConnectionPool(host='discovery.etcd.io', port=443): Max retries exceeded with url: /new?size=1 (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f776b0ab450>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)): ConnectionError: HTTPSConnectionPool(host='discovery.etcd.io', port=443): Max retries exceeded with url: /new?size=1 (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f776b0ab450>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))
magnum-conductor.log:132:2018-01-31 09:41:19.690 4977 ERROR oslo_messaging.rpc.server [req-8b4d63f6-1839-4c24-893f-e299efeb9fb8 - - - - -] Exception during message handling: GetDiscoveryUrlFailed: Failed to get discovery url from 'https://discovery.etcd.io/new?size=1'.

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But with internet access cluster created successfully. Only without internet access cluster creation failed. I am using openstack pike version. Can Someone help me how to create cluster without internet access?