Neutron is a virtual network service for Openstack, and a part of
Netstack. Just like OpenStack Nova provides an API to dynamically
request and configure virtual servers, Neutron provides an API to
dynamically request and configure virtual networks. These networks
connect "interfaces" from other OpenStack services (e.g., virtual NICs
from Nova VMs). The Neutron API supports extensions to provide
advanced network capabilities (e.g., QoS, ACLs, network monitoring,
This charm provides the OpenStack Neutron Open vSwitch agent, managing
L2 connectivity on nova-compute services.
This subordinate charm provides the Neutron OpenvSwitch configuration for a compute node.
Once deployed it takes over the management of the Neutron base and plugin configuration on the compute node.
To deploy (partial deployment of linked charms only):
juju deploy rabbitmq-server
juju deploy neutron-api
juju deploy nova-compute
juju deploy neutron-openvswitch
juju add-relation neutron-openvswitch nova-compute
juju add-relation neutron-openvswitch neutron-api
juju add-relation neutron-openvswitch rabbitmq-server
Note that the rabbitmq-server can optionally be a different instance of the rabbitmq-server charm than used by OpenStack Nova:
juju deploy rabbitmq-server rmq-neutron
juju add-relation neutron-openvswitch rmq-neutron
juju add-relation neutron-api rmq-neutron
The neutron-api and neutron-openvswitch charms must be related to the same instance of the rabbitmq-server charm.
It should only be used with OpenStack Icehouse and above and requires a separate neutron-api service to have been deployed.
WARNING: this feature allows you to effectively disable security on your cloud!
This charm has a configuration option to allow users to disable any per-instance security group management; this must used with neutron-security-groups enabled in the neutron-api charm and could be used to turn off security on selected set of compute nodes:
juju deploy neutron-openvswitch neutron-openvswitch-insecure
juju set neutron-openvswitch-insecure disable-security-groups=True prevent-arp-spoofing=False
juju deploy nova-compute nova-compute-insecure
juju add-relation nova-compute-insecure neutron-openvswitch-insecure
These compute nodes could then be accessed by cloud users via use of host aggregates with specific flavors to target instances to hypervisors with no per-instance security.
This charm supports the use of Juju Network Spaces, allowing the charm to be bound to network space configurations managed directly by Juju. This is only supported with Juju 2.0 and above.
Open vSwitch endpoints can be configured using the 'data' extra-binding, ensuring that tunnel traffic is routed across the correct host network interfaces:
juju deploy neutron-openvswitch --bind "data=data-space"
alternatively these can also be provided as part of a juju native bundle configuration:
NOTE: Spaces must be configured in the underlying provider prior to attempting to use them.
NOTE: Existing deployments using os-data-network configuration options will continue to function; this option is preferred over any network space binding provided if set.
For OpenStack Mitaka running on Ubuntu 16.04, its possible to use experimental DPDK userspace network acceleration with Open vSwitch and OpenStack.
Currently, this charm supports use of DPDK enabled devices in bridges supporting connectivity to provider networks.
To use DPDK, you'll need to have supported network cards in your server infrastructure (see dpdk-nics[DPDK documentation]); DPDK must be enabled and configured during deployment of the charm, for example:
data-port: "br-phynet1:a8:9d:21:cf:93:fc br-phynet2:a8:9d:21:cf:93:fd br-phynet3:a8:9d:21:cf:93:fe"
As devices are not typically named consistently across servers, multiple instances of each bridge -> mac address mapping can be provided; the charm deals with resolution of the set of bridge -> port mappings that are required for each individual unit of the charm.
DPDK requires the use of hugepages, which is not directly configured in the neutron-openvswitch charm; Hugepage configuration can either be done by providing kernel boot command line options for individual servers using MAAS or using the 'hugepages' configuration option of the nova-compute charm:
By default, the charm will configure Open vSwitch/DPDK to consume a processor core + 1G of RAM from each NUMA node on the unit being deployed; this can be tuned using the dpdk-socket-memory and dpdk-socket-cores configuration options of the charm. The userspace kernel driver can be configured using the dpdk-driver option. See config.yaml for more details.
NOTE: Changing dpdk-socket-* configuration options will trigger a restart of Open vSwitch, which currently causes connectivity to running instances to be lost - connectivity can only be restored with a stop/start of each instance.
NOTE: Enabling DPDK support automatically disables security groups for instances.
For deployments using Open vSwitch 2.6.0 or later (OpenStack Ocata on Ubuntu 16.04 onwards), its also possible to use native Open vSwitch DPDK bonding to provide increased resilience for DPDK based deployments.
This feature is configured using the dpdk-bond-mappings and dpdk-bond-config options of this charm, for example:
dpdk-bond-mappings: "dpdk-bond0:a8:9d:21:cf:93:fc dpdk-bond0:a8:9d:21:cf:93:fd"
In this example, the PCI devices associated with the two MAC addresses provided will be configured as an OVS DPDK bond device named dpdk-bond0; this bond device is then used in br-phynet1 to provide resilient connectivity to the underlying network fabric.
The charm will automatically detect which PCI devices are on each unit of the application based on the dpdk-bond-mappings configuration provided, supporting use in environments where network device naming may not be consistent across units.
NOTE: External port configuration only applies when DVR mode is enabled.
All network types (internal, external) are configured with bridge-mappings and
data-port and the flat-network-providers configuration option of the
neutron-api charm. Once deployed, you can configure the network specifics
using neutron net-create.
If the device name is not consistent between hosts, you can specify the same
bridge multiple times with MAC addresses instead of interface names. The charm
will loop through the list and configure the first matching interface.
Basic configuration of a single external network, typically used as floating IP
addresses combined with a GRE private network:
neutron net-create --provider:network_type flat \
--provider:physical_network physnet1 --router:external=true \
neutron router-gateway-set provider external
Alternative configuration with two networks, where the internal private
network is directly connected to the gateway with public IP addresses but a
floating IP address range is also offered.
bridge-mappings: physnet1:br-data external:br-ex
data-port: br-data:eth1 br-ex:eth2
flat-network-providers: physnet1 external
Alternative configuration with two external networks, one for public instance
addresses and one for floating IP addresses. Both networks are on the same
physical network connection (but they might be on different VLANs, that is
configured later using neutron net-create).
neutron net-create --provider:network_type vlan \
--provider:segmentation_id 400 \
--provider:physical_network physnet1 --shared external
neutron net-create --provider:network_type vlan \
--provider:segmentation_id 401 \
--provider:physical_network physnet1 --shared --router:external=true \
neutron router-gateway-set provider floating
This replaces the previous system of using ext-port, which always created a bridge
called br-ex for external networks which was used implicitly by external router