Before launching your first instance, you must create the necessary
virtual network infrastructure to which the instance will connect.
This network typically provides internet access
from instances. You can enable internet access
to individual instances using a
floating IP address and suitable
security group rules. The admin
tenant owns this network because it provides external network access
for multiple tenants.
This network shares the same subnet associated with the physical network connected to the external interface on the compute node. You should specify an exclusive slice of this subnet to prevent interference with other devices on the external network.
![[Note]](../common/images/admon/note.png) | Note |
|---|---|
Perform these commands on the controller node. |
To create the network
Source the
admintenant credentials:$ source admin-openrc.sh
Create the network:
Replace
NETWORK_CIDRwith the subnet associated with the physical network.$ nova network-create demo-net --bridge br100 --multi-host T \ --fixed-range-v4
NETWORK_CIDRFor example, using an exclusive slice of
203.0.113.0/24with IP address range203.0.113.24to203.0.113.32:$ nova network-create demo-net --bridge br100 --multi-host T \ --fixed-range-v4 203.0.113.24/29
Note This command provides no output.
Verify creation of the network:
$ nova net-list +--------------------------------------+----------+------------------+ | ID | Label | CIDR | +--------------------------------------+----------+------------------+ | 84b34a65-a762-44d6-8b5e-3b461a53f513 | demo-net | 203.0.113.24/29 | +--------------------------------------+----------+------------------+
