Installation¶

The networking-ovn repository includes integration with DevStack that enables creation of a simple Open Virtual Network (OVN) development and test environment. This document discusses what is required for manual installation or integration into a production OpenStack deployment tool of conventional architectures that include the following types of nodes:

Controller - Runs OpenStack control plane services such as REST APIs and databases.
Network - Runs the layer-2, layer-3 (routing), DHCP, and metadata agents for the Networking service. Some agents optional. Usually provides connectivity between provider (public) and project (private) networks via NAT and floating IP addresses.

Note

Some tools deploy these services on controller nodes.
Compute - Runs the hypervisor and layer-2 agent for the Networking service.

Packaging¶

Open vSwitch (OVS) includes OVN beginning with version 2.5 and considers it experimental. The Networking service integration for OVN uses an independent package, typically networking-ovn.

Building OVS from source automatically installs OVN. For deployment tools using distribution packages, the openvswitch-ovn package for RHEL/CentOS and compatible distributions automatically installs openvswitch as a dependency. Ubuntu/Debian includes ovn-central, ovn-host, ovn-docker, and ovn-common packages that pull in the appropriate Open vSwitch dependencies as needed.

A python-networking-ovn RPM may be obtained for Fedora or CentOS from the RDO project. A package based on the master branch of networking-ovn can be found at http://trunk.rdoproject.org/.

Fedora and CentOS RPM builds of OVS and OVN from the master branch of ovs can be found in this COPR repository: https://copr.fedorainfracloud.org/coprs/leifmadsen/ovs-master/. If you would like packages that are built with DPDK integration enabled, you can try this COPR repository, instead: https://copr.fedorainfracloud.org/coprs/pmatilai/dpdk-snapshot/.

Controller nodes¶

Each controller node runs the OVS service (including dependent services such as ovsdb-server) and the ovn-northd service. However, only a single instance of the ovsdb-server and ovn-northd services can operate in a deployment. However, deployment tools can implement active/passive high-availability using a management tool that monitors service health and automatically starts these services on another node after failure of the primary node. See the FAQ for more information.

Install the openvswitch-ovn and networking-ovn packages.
Start the OVS service. The central OVS service starts the ovsdb-server service that manages OVN databases.

Using the systemd unit:
```
# systemctl start openvswitch
```
Using the ovs-ctl script:
```
# /usr/share/openvswitch/scripts/ovs-ctl start  --system-id="random"
```
Configure the ovsdb-server component. By default, the ovsdb-server service only permits local access to databases via Unix socket. However, OVN services on compute nodes require access to these databases.
- Permit remote database access.
```
# ovs-appctl -t ovsdb-server ovsdb-server/add-remote ptcp:6640:IP_ADDRESS
```
  Replace IP_ADDRESS with the IP address of the management network interface on the controller node.
  
  Note
  
  Permit remote access to TCP port 6640 on any host firewall.

Start the ovn-northd service.

Using the systemd unit:

# systemctl start ovn-northd

Using the ovn-ctl script:

# /usr/share/openvswitch/scripts/ovn-ctl start_northd

Options for start_northd:

# /usr/share/openvswitch/scripts/ovn-ctl start_northd --help
# ...
# DB_NB_SOCK="/usr/local/etc/openvswitch/nb_db.sock"
# DB_NB_PID="/usr/local/etc/openvswitch/ovnnb_db.pid"
# DB_SB_SOCK="usr/local/etc/openvswitch/sb_db.sock"
# DB_SB_PID="/usr/local/etc/openvswitch/ovnsb_db.pid"
# ...

Configure the Networking server component. The Networking service implements OVN as an ML2 driver. Edit the /etc/neutron/neutron.conf file:
- Enable the ML2 core plug-in.
```
[DEFAULT]
...
core_plugin = neutron.plugins.ml2.plugin.Ml2Plugin
```
- If the QoS service is enabled then you also need to enable the OVN QoS notification driver.
```
[qos]
...
notification_drivers = ovn-qos
```
- (Optional) Enable the native or conventional layer-3 service.
```
[DEFAULT]
...
service_plugins = L3_SERVICE
```
  Note
  
  Replace L3_SERVICE with networking_ovn.l3.l3_ovn.OVNL3RouterPlugin to enable the native layer-3 service or with neutron.services.l3_router.l3_router_plugin.L3RouterPlugin to enable the conventional layer-3 service. See Features and FAQ for more information.
Configure the ML2 plug-in. Edit the /etc/neutron/plugins/ml2/ml2_conf.ini file:
- Configure the OVN mechanism driver, network type drivers, self-service (tenant) network types, and enable the port security extension.
```
[ml2]
...
mechanism_drivers = ovn
type_drivers = local,flat,vlan,geneve
tenant_network_types = geneve
extension_drivers = port_security
overlay_ip_version = 4
```
Note

To enable VLAN self-service networks, add vlan to the tenant_network_types option. The first network type in the list becomes the default self-service network type.

To use IPv6 for all overlay (tunnel) network endpoints, set the overlay_ip_version option to 6.
- Configure the Geneve ID range and maximum header size. The IP version overhead (20 bytes for IPv4 (default) or 40 bytes for IPv6) is added to the maximum header size based on the ML2 overlay_ip_version option.
```
[ml2_type_geneve]
...
vni_ranges = 1:65536
max_header_size = 38
```
  Note
  
  The Networking service uses the vni_ranges option to allocate network segments. However, OVN ignores the actual values. Thus, the ID range only determines the quantity of Geneve networks in the environment. For example, a range of 5001:6000 defines a maximum of 1000 Geneve networks.
- Optionally, enable support for VLAN provider and self-service networks on one or more physical networks. If you specify only the physical network, only administrative (privileged) users can manage VLAN networks. Additionally specifying a VLAN ID range for a physical network enables regular (non-privileged) users to manage VLAN networks. The Networking service allocates the VLAN ID for each self-service network using the VLAN ID range for the physical network.
```
[ml2_type_vlan]
...
network_vlan_ranges = PHYSICAL_NETWORK:MIN_VLAN_ID:MAX_VLAN_ID
```
  Replace PHYSICAL_NETWORK with the physical network name and optionally define the minimum and maximum VLAN IDs. Use a comma to separate each physical network.
  
  For example, to enable support for administrative VLAN networks on the physnet1 network and self-service VLAN networks on the physnet2 network using VLAN IDs 1001 to 2000:
```
network_vlan_ranges = physnet1,physnet2:1001:2000
```
- Enable security groups.
```
[securitygroup]
...
enable_security_group = true
```
  Note
  
  The firewall_driver option under [securitygroup] is ignored since the OVN ML2 driver itself handles security groups.
- Configure OVS database access, OVN L3 mode, L3 scheduler, L3 admin net CIDR and OVN DHCP mode
```
[ovn]
...
ovn_nb_connection = tcp:IP_ADDRESS:6641
ovn_sb_connection = tcp:IP_ADDRESS:6642
ovn_l3_mode = OVN_L3_MODE
ovn_l3_scheduler = OVN_L3_SCHEDULER
ovn_l3_admin_net_cidr = OVN_L3_ADMIN_NET_CIDR
ovn_native_dhcp = OVN_NATIVE_DHCP
```
  Note
  
  Replace IP_ADDRESS with the IP address of the controller node that runs the ovsdb-server service. Replace OVN_L3_MODE with True if you enabled the native layer-3 service in /etc/neutron/neutron.conf else False. The ovn_l3_scheduler value is only valid if ovn_l3_mode is set to True. Replace OVN_L3_SCHEDULER with leastloaded if you want the scheduler to select a compute node with the least number of gateway routers or chance if you want the scheduler to randomly select a compute node from the available list of compute nodes. The ovn_l3_admin_net_cidr value is only valid if ovn_l3_mode is set to True. The deafult value for OVN_L3_ADMIN_NET_CIDR is 169.254.128.0/30, if you want to use a diferent cidr replace OVN_L3_ADMIN_NET_CIDR to a new cidr. And finally, replace OVN_NATIVE_DHCP with True if you want to enable the native DHCP service else False to use the conventional DHCP agent.
Start the neutron-server service.

Network nodes¶

Deployments using OVN native layer-3 and DHCP services do not require conventional network nodes because connectivity to external networks (including VTEP gateways) and routing occurs on compute nodes. OVN currently relies on the conventional metadata agent that typically operates on network nodes. However, you can deploy this agent on controller or compute nodes.

Compute nodes¶

Each compute node runs the OVS and ovn-controller services. The ovn-controller service replaces the conventional OVS layer-2 agent.

Install the openvswitch-ovn and networking-ovn packages.

Start the OVS service.

Using the systemd unit:

# systemctl start openvswitch

Using the ovs-ctl script:

# /usr/share/openvswitch/scripts/ovs-ctl start --system-id="random"

Configure the OVS service.
- Use OVS databases on the controller node.
```
# ovs-vsctl set open . external-ids:ovn-remote=tcp:IP_ADDRESS:6642
```
  Replace IP_ADDRESS with the IP address of the controller node that runs the ovsdb-server service.
- Enable one or more overlay network protocols. At a minimum, OVN requires enabling the geneve protocol. Deployments using VTEP gateways should also enable the vxlan protocol.
```
# ovs-vsctl set open . external-ids:ovn-encap-type=geneve,vxlan
```
  Note
  
  Deployments without VTEP gateways can safely enable both protocols.
  
  Note
  
  Overlay network protocols generally require reducing MTU on VM interfaces to account for additional packet overhead. See the DHCP agent configuration in the Installation Guide for more information.
- Configure the overlay network local endpoint IP address.
```
# ovs-vsctl set open . external-ids:ovn-encap-ip=IP_ADDRESS
```
  Replace IP_ADDRESS with the IP address of the overlay network interface on the compute node.

Start the ovn-controller service.

Using the systemd unit:

# systemctl start ovn-controller

Using the ovn-ctl script:

# /usr/share/openvswitch/scripts/ovn-ctl start_controller

Verify operation¶

Each compute node should contain an ovn-controller instance.
```
# ovn-sbctl show
  <output>
```

OpenStack

Installation¶

Packaging¶

Controller nodes¶

Network nodes¶

Compute nodes¶

Verify operation¶

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