In our architecture, direct attached dhcp IPs are in VLAN 201
neutron net-create dhcp-192-168-201 \ --shared --router:external false \ --provider:network_type vlan \ --provider:physical_network vlan \ --provider:segmentation_id 201
+---------------------------+--------------------------------------+ | Field | Value | +---------------------------+--------------------------------------+ | admin_state_up | True | | id | 1d0fc020-d33b-406e-a287-02032a5a09b0 | | mtu | 0 | | name | dhcp-192-168-201 | | port_security_enabled | True | | provider:network_type | vlan | | provider:physical_network | vlan | | provider:segmentation_id | 201 | | router:external | False | | shared | True | | status | ACTIVE | | subnets | | | tenant_id | e4cd3028bd484741a23bd2b17f3d368e | +---------------------------+--------------------------------------+
note down the id .. we need it in the command below
neutron subnet-create --allocation-pool start=192.168.201.5,end=192.168.201.250 \ --ip-version 4 --no-gateway --host-route destination=0.0.0.0/0,nexthop=192.168.201.1 \ --enable-dhcp --name dhcp-192-168-201 --dns-nameserver 8.8.8.8 \ 1d0fc020-d33b-406e-a287-02032a5a09b0 192.168.201.0/24
Created a new subnet:
+-------------------+----------------------------------------------------------+
| Field | Value |
+-------------------+----------------------------------------------------------+
| allocation_pools | {"start": "192.168.201.5", "end": "192.168.201.250"} |
| cidr | 192.168.201.0/24 |
| dns_nameservers | 8.8.8.8 |
| enable_dhcp | True |
| gateway_ip | |
| host_routes | {"destination": "0.0.0.0/0", "nexthop": "192.168.201.1"} |
| id | c1330e34-c15a-4938-9561-01e569cf051f |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | dhcp-192-168-201 |
| network_id | 1d0fc020-d33b-406e-a287-02032a5a09b0 |
| subnetpool_id | |
| tenant_id | e4cd3028bd484741a23bd2b17f3d368e |
+-------------------+----------------------------------------------------------+
neutron net-list
+--------------------------------------+------------------+-------------------------------------------------------+ | id | name | subnets | +--------------------------------------+------------------+-------------------------------------------------------+ | 1d0fc020-d33b-406e-a287-02032a5a09b0 | dhcp-192-168-201 | c1330e34-c15a-4938-9561-01e569cf051f 192.168.201.0/24 | +--------------------------------------+------------------+-------------------------------------------------------+
neutron subnet-list
+--------------------------------------+------------------+------------------+------------------------------------------------------+
| id | name | cidr | allocation_pools |
+--------------------------------------+------------------+------------------+------------------------------------------------------+
| c1330e34-c15a-4938-9561-01e569cf051f | dhcp-192-168-201 | 192.168.201.0/24 | {"start": "192.168.201.5", "end": "192.168.201.250"} |
+--------------------------------------+------------------+------------------+------------------------------------------------------+
Now you can select DHCP and get the IP directly to instance.
