openstack-ansible-os_neutron/doc/source/app-openvswitch-dvr.rst

Scenario - Using Open vSwitch with DVR

Overview

Operators can choose to utilize Open vSwitch with Distributed Virtual Routing (DVR) instead of Linux Bridges or plain Open vSwitch for the neutron ML2 agent. This offers the possibility to deploy virtual routing instances outside the usual neutron networking node. This document outlines how to set it up in your environment.

Recommended reading

We recommend that you read the following documents before proceeding:

• Neutron documentation on Open vSwitch DVR OpenStack deployments: https://docs.openstack.org/neutron/latest/admin/deploy-ovs-ha-dvr.html
• Blog post on how OpenStack-Ansible works with Open vSwitch: https://trumant.github.io/openstack-ansible-dvr-with-openvswitch.html

Prerequisites

Configure your networking according the Open vSwitch setup:

• Scenario - Using Open vSwitch https://docs.openstack.org/openstack-ansible-os_neutron/latest/app-openvswitch.html

OpenStack-Ansible user variables

Set the following user variables in your /etc/openstack_deploy/user_variables.yml:

# Ensure the openvswitch kernel module is loaded
openstack_host_specific_kernel_modules:
  - name: "openvswitch"
    pattern: "CONFIG_OPENVSWITCH"
    group: "network_hosts"

### neutron specific config
neutron_plugin_type: ml2.ovs.dvr

neutron_ml2_drivers_type: "flat,vlan"

# Typically this would be defined by the os-neutron-install
# playbook. The provider_networks library would parse the
# provider_networks list in openstack_user_config.yml and
# generate the values of network_types, network_vlan_ranges
# and network_mappings. network_mappings would have a
# different value for each host in the inventory based on
# whether or not the host was metal (typically a compute host)
# or a container (typically a neutron agent container)
#
# When using Open vSwitch, we override it to take into account
# the Open vSwitch bridge we are going to define outside of
# OpenStack-Ansible plays
neutron_provider_networks:
  network_flat_networks: "*"
  network_types: "vlan"
  network_vlan_ranges: "physnet1:102:199"
  network_mappings: "physnet1:br-provider"

Note: The only difference to the Standard Open vSwitch configuration is the setting of the ml2_plugin_type.

Customization is needed to support additional network types such as vxlan, GRE or Geneve. Refer to the neutron agent configuration for more information on these attributes.