Networking Guide¶
The Tricircle is to provide networking automation across Neutron servers in multi-region OpenStack clouds deployment, many cross Neutron networking mode are supported. In this guide, how to use CLI to setup typical networking mode will be described.
Prerequisites¶
One CentralRegion in which central Neutron and Tricircle services are started, and central Neutron is configured with Tricircle Central Neutron plugin properly. And at least two regions(RegionOne, RegionTwo) in which Tricircle Local Neutron plugin is configured properly in local Neutron.
RegionOne is mapped to az1, and RegionTwo is mapped to az2 by pod management through Tricircle Admin API.
You can use az1 or RegionOne as the value of availability-zone-hint when creating a network. Although in this document only one region in one availability zone, one availability zone can include more than one region in Tricircle pod management, so if you specify az1 as the value, then it means the network will reside in az1, and az1 is mapped to RegionOne, if you add more regions into az1, then the network can spread into these regions too.
Please refer to the installation guide and configuration guide how to setup multi-region environment with Tricircle service enabled.
If you setup the environment through devstack, you can get these settings which are used in this document as follows:
Suppose that each node has 3 interfaces, and eth1 for tenant vlan network, eth2 for external vlan network. If you want to verify the data plane connectivity, please make sure the bridges “br-vlan” and “br-ext” are connected to regarding interface. Using following command to connect the bridge to physical ethernet interface, as shown below, “br-vlan” is wired to eth1, and “br-ext” to eth2:
sudo ovs-vsctl add-br br-vlan
sudo ovs-vsctl add-port br-vlan eth1
sudo ovs-vsctl add-br br-ext
sudo ovs-vsctl add-port br-ext eth2
Suppose the vlan range for tenant network is 101~150, external network is 151~200, in the node which will run central Neutron and Tricircle services, configure the local.conf like this:
Q_ML2_PLUGIN_VLAN_TYPE_OPTIONS=(network_vlan_ranges=bridge:101:150,extern:151:200)
OVS_BRIDGE_MAPPINGS=bridge:br-vlan,extern:br-ext
TRICIRCLE_START_SERVICES=True
enable_plugin tricircle https://github.com/openstack/tricircle/
In the node which will run local Neutron without Tricircle services, configure the local.conf like this:
Q_ML2_PLUGIN_VLAN_TYPE_OPTIONS=(network_vlan_ranges=bridge:101:150,extern:151:200)
OVS_BRIDGE_MAPPINGS=bridge:br-vlan,extern:br-ext
TRICIRCLE_START_SERVICES=False
enable_plugin tricircle https://github.com/openstack/tricircle/
You may have noticed that the only difference is TRICIRCLE_START_SERVICES is True or False. All examples given in this document will be based on these settings.
In both RegionOne and RegionTwo, external network is able to be provisioned, the settings will look like this in /etc/neutron/plugins/ml2/ml2_conf.ini:
network_vlan_ranges = bridge:101:150,extern:151:200
vni_ranges = 1:1000
bridge_mappings = bridge:br-vlan,extern:br-ext
Please be aware that the physical network name for tenant VLAN network is “bridge”, and the external network physical network name is “extern”.
In central Neutron’s configuration file, the default settings look like as follows:
bridge_network_type = vlan
network_vlan_ranges = bridge:101:150
tenant_network_types = local,vlan
type_drivers = local,vlan
The default network type in central Neutron is local network, i.e, one network can only be presented in one local Neutron. In which region the local network will be located, it’s up to in which region the first instance will be booted in this network. After that, it’ll fail if you want to boot instance in another region to this network. The local network could be VLAN or VxLAN or GRE network by default, it’s up to your local Neutron’s configuration.
If you want to create a L2 network across multiple Neutron, then you have to speficy –provider-network-type vlan in network creation command for vlan network type. Currently only vlan network type could work as the bridge network. VxLAN network to support L2 networking across Neutron will be introduced later.
You can create L2 network for different purposes, and the supported network types for different purposes are summarized as follows.
Networking purpose Supported Local L2 network for instances VLAN, VxLAN Cross Neutron L2 network for instances VLAN Bridge network for routers VLAN External network VLAN