Ubuntu 20.04
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OpenStack Yoga : Configure Neutron Network
2022/04/04
 
Configure Networking for Virtual Machine Instances.
For example, configure FLAT type of networking on here.
The Node has 2 network interfaces like follows.
        eth0|10.0.0.30 
+-----------+-----------+
|    [ Control Node ]   |
|                       |
|  MariaDB    RabbitMQ  |
|  Memcached  httpd     |
|  Keystone   Glance    |
|   Nova API,Compute    |
|    Neutron Server     |
|  L2,L3,Metadata Agent |
+-----------+-----------+
        eth1|(UP with no IP)

[1] Configure Neutron services.
# create a setting file for anonymous interface
# replace the name [eth1] to your environment

root@dlp ~(keystone)#
vi /etc/systemd/network/eth1.network
[Match]
Name=eth1

[Network]
LinkLocalAddressing=no
IPv6AcceptRA=no

root@dlp ~(keystone)#
ip link set eth1 up

root@dlp ~(keystone)#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# line 206 : add

[ml2_type_flat]
flat_networks = physnet1
root@dlp ~(keystone)#
vi /etc/neutron/plugins/ml2/linuxbridge_agent.ini
# line 190 : add

[linux_bridge]
physical_interface_mappings = physnet1:eth1
root@dlp ~(keystone)#
systemctl restart neutron-linuxbridge-agent

[2] Create virtual network.
root@dlp ~(keystone)#
projectID=$(openstack project list | grep service | awk '{print $2}')
# create network named [sharednet1]

root@dlp ~(keystone)#
openstack network create --project $projectID \
--share --provider-network-type flat --provider-physical-network physnet1 sharednet1

+---------------------------+-----------------------------------------------------------------+
| Field                     | Value                                                           |
+---------------------------+-----------------------------------------------------------------+
| admin_state_up            | UP                                                              |
| availability_zone_hints   |                                                                 |
| availability_zones        |                                                                 |
| created_at                | 2022-04-01T05:38:33Z                                            |
| description               |                                                                 |
| dns_domain                | None                                                            |
| id                        | 1466886c-0af5-4cee-9b8f-9819a7a6da3c                            |
| ipv4_address_scope        | None                                                            |
| ipv6_address_scope        | None                                                            |
| is_default                | False                                                           |
| is_vlan_transparent       | None                                                            |
| location                  | Munch({'cloud': '', 'region_name': '', 'zone': None, 'proj..... |
| mtu                       | 1500                                                            |
| name                      | sharednet1                                                      |
| port_security_enabled     | True                                                            |
| project_id                | c043fb355eff47e69642adfcd7a55620                                |
| provider:network_type     | flat                                                            |
| provider:physical_network | physnet1                                                        |
| provider:segmentation_id  | None                                                            |
| qos_policy_id             | None                                                            |
| revision_number           | 1                                                               |
| router:external           | Internal                                                        |
| segments                  | None                                                            |
| shared                    | True                                                            |
| status                    | ACTIVE                                                          |
| subnets                   |                                                                 |
| tags                      |                                                                 |
| updated_at                | 2022-04-01T05:38:33Z                                            |
+---------------------------+-----------------------------------------------------------------+

# create subnet [10.0.0.0/24] in [sharednet1]

root@dlp ~(keystone)#
openstack subnet create subnet1 --network sharednet1 \
--project $projectID --subnet-range 10.0.0.0/24 \
--allocation-pool start=10.0.0.200,end=10.0.0.254 \
--gateway 10.0.0.1 --dns-nameserver 10.0.0.10

+----------------------+------------------------------------------------------------------------+
| Field                | Value                                                                  |
+----------------------+------------------------------------------------------------------------+
| allocation_pools     | 10.0.0.200-10.0.0.254                                                  |
| cidr                 | 10.0.0.0/24                                                            |
| created_at           | 2022-04-01T05:39:35Z                                                   |
| description          |                                                                        |
| dns_nameservers      | 10.0.0.10                                                              |
| dns_publish_fixed_ip | None                                                                   |
| enable_dhcp          | True                                                                   |
| gateway_ip           | 10.0.0.1                                                               |
| host_routes          |                                                                        |
| id                   | d7debb8e-4978-46ee-9c45-b71b2a3ed4d1                                   |
| ip_version           | 4                                                                      |
| ipv6_address_mode    | None                                                                   |
| ipv6_ra_mode         | None                                                                   |
| location             | Munch({'cloud': '', 'region_name': '', 'zone': None, 'project': M..... |
| name                 | subnet1                                                                |
| network_id           | 1466886c-0af5-4cee-9b8f-9819a7a6da3c                                   |
| project_id           | c043fb355eff47e69642adfcd7a55620                                       |
| revision_number      | 0                                                                      |
| segment_id           | None                                                                   |
| service_types        |                                                                        |
| subnetpool_id        | None                                                                   |
| tags                 |                                                                        |
| updated_at           | 2022-04-01T05:39:35Z                                                   |
+----------------------+------------------------------------------------------------------------+

# confirm settings

root@dlp ~(keystone)#
openstack network list

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| 1466886c-0af5-4cee-9b8f-9819a7a6da3c | sharednet1 | d7debb8e-4978-46ee-9c45-b71b2a3ed4d1 |
+--------------------------------------+------------+--------------------------------------+

root@dlp ~(keystone)#
openstack subnet list

+--------------------------------------+---------+--------------------------------------+-------------+
| ID                                   | Name    | Network                              | Subnet      |
+--------------------------------------+---------+--------------------------------------+-------------+
| d7debb8e-4978-46ee-9c45-b71b2a3ed4d1 | subnet1 | 1466886c-0af5-4cee-9b8f-9819a7a6da3c | 10.0.0.0/24 |
+--------------------------------------+---------+--------------------------------------+-------------+
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