Create initial network
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.
Perform these commands on the controller node.
To create the network
Source the admin tenant credentials:
$ source admin-openrc.sh
Create the network:
Replace NETWORK_CIDR with the subnet
associated with the physical network.
$ nova network-create demo-net --bridge br100 --multi-host T \
--fixed-range-v4 NETWORK_CIDR
For example, using an exclusive slice of
203.0.113.0/24 with IP address range
203.0.113.24 to 203.0.113.32:
$ nova network-create demo-net --bridge br100 --multi-host T \
--fixed-range-v4 203.0.113.24/29
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 |
+--------------------------------------+----------+------------------+