When I create network/subnetwork, qdchp name space does not create?

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With no keystone configured, openstack(nova, neutron, glance etc.) are installed on Ubuntu12.04 successfully. when I use curl command to create network/subnetwork, use ip netns to show the qdhcp name space, but it is empty, who knows why?

curl -s -X POST -d '{"network":{"tenant_id":"f406297155a24bffb9a52aa9da5b3e89", "name":"demo-net","admin_state_up":false}}' http://127.0.0.1:9696/v2.0/networks -H "X-Auth-Token:f406297155a24bffb9a52aa9da5b3e89" -H "Content-type:application/json" | python -mjson.tool

curl -s -X POST -d '{"subnet":{"tenant_id":"f406297155a24bffb9a52aa9da5b3e89", "enable_dhcp": true, "network_id":"b78123d6-d92a-429b-be94-fb54645779c0", "name":"demo-subnet", "cidr":"192.8.8.0/24","allocation_pools": [{"start": "192.8.8.2", "end": "192.8.8.9"}], "ip_version": 4}}' http://127.0.0.1:9696/v2.0/subnets -H "X-Auth- Token:f406297155a24bffb9a52aa9da5b3e89" -H "Content-Type: application/json" -H "Accept: application/json" -H "User-Agent: python-neutronclient"