Chapter 4. Configuring the Overcloud after Creation

The Overcloud requires a IPv6-based Tenant network for instances. Source the overcloudrc file and create an initial Tenant network in neutron. For example:

$ source ~/overcloudrc
$ neutron net-create default --provider:physical_network datacentre --provider:network_type vlan --provider:segmentation_id 101
$ neutron subnet-create default 2001:db8:fd00:6000::/64 --ipv6-ra-mode slaac --ipv6-address-mode slaac --ip-version 6 --name default

This creates a basic neutron network called default. Confirm the created network with neutron net-list:

$ neutron net-list

This scenario configured the node interfaces to use the External network. However, you still need to create this network on the Overcloud so that we can provide network access.

$ neutron net-create public --router:external --provider:physical_network datacentre --provider:network_type vlan --provider:segmentation_id 100
$ neutron subnet-create public 2001:db8:0:2::/64 --ip-version 6 --gateway 2001:db8::1 --allocation-pool start=2001:db8:0:2::2,end=2001:db8:0:2::ffff --ip-version 6 --ipv6_address_mode=slaac --ipv6_ra_mode=slaac

This creates a network called public provides an allocation pool of over 65000 IPv6 addresses for our instances.

Create a router to route instance traffic to the External network.

neutron router-create public-router
neutron router-gateway-set public-router public