Managing subnets using OpenStack terminal client¶

Create a subnet¶

To create a private subnet from the from the OpenStack terminal client, follow these steps:

Run: openstack network list --internal, this will give you a list of available networks to add a subnet to. Note the name of the network.
Decide what subnet range to use. More information in the Subnet Format article.
Decide on using DHCP (recommended) and what pool to use. More information in the DHCP article.
Decide if you want to use a gateway or not. More information in the Connect subnet to router article.
Run: openstack subnet create --subnet-range=[RANGE] --gateway=auto --network=[NETWORK NAME] --dns-nameserver=83.168.225.225 --dns-nameserver=83.168.226.226 --allocation-pool start=[POOL START IP],end=[POOL END IP] [SUBNET NAME], replacing the items in brackets to the values identified in previous steps.

Assign subnet to router¶

To connect to a router, follow these steps:

Run: openstack router list to get the list of your available routers. Save the name of the router you want to connect the subnet to.
Run: openstack subnet list to get the list of your available subnets. Save the name of the subnet you want to connect to the router.
Run: openstack router add subnet [ROUTER NAME] [SUBNET NAME]

Note

In the above example, the router will for instance use the default gateway IP. To have more granular control, try to add “-?” to the commands, you will then get the help function that will show you more options to work with.