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Support for OpenStack LBaaS

 

Starting with Release 3.1, Contrail provides support for the OpenStack Load Balancer as a Service (LBaaS) Version 2.0 APIs in the Liberty release of OpenStack.

OpenStack Neutron LBaaS Version 2.0

Platform Support

Table 1 shows which Contrail with OpenStack release combinations support which version of OpenStack LBaaS APIs.

Table 1: Contrail OpenStack Platform Support for LBaaS Versions

Contrail OpenStack Platform

LBaaS Support

Contrail-3.1-Liberty (and subsequent OS releases)

Only LBaaS v2 is supported.

Contrail-3.0-Liberty (and subsequent OS releases)

LBaaS v1 is default. LBaaS v2 is Beta.

<Contrail-any-release>-Kilo (and previous OS releases)

Only LBaaS v1 is supported.

Using OpenStack LBaaS Version 2.0

The OpenStack LBaaS Version 2.0 extension enables tenants to manage load balancers for VMs, for example, load-balancing client traffic from a network to application services, such as VMs, on the same network. The LBaaS Version 2.0 extension is used to create and manage load balancers, listeners, pools, members of a pool, and health monitors, and to view the status of a resource.

For LBaaS v2.0, the Contrail controller aggregates the configuration by provider. For example, if haproxy is the provider, the controller generates the configuration for haproxy and eliminates the need to send all of the load-balancer resources to the vrouter-agent; only the generated configuration is sent, as part of the service instance.

For more information about OpenStack v2.0 APIs, refer to the section LBaaS 2.0 (STABLE) (lbaas, loadbalancers, listeners, health_monitors, pools, members), at http://developer.openstack.org/api-ref-networking-v2-ext.html.

LBaaS v2.0 also allows users to listen to multiple ports for the same virtual IP, by decoupling the virtual IP address from the port.

The object model has the following resources:

  • Load balancer—Holds the virtual IP address

  • Listeners—One or many listeners with different ports, protocols, and so on

  • Pools

  • Members

  • Health monitors

Support for Multiple Certificates per Listener

Multiple certificates per listener are supported, with OpenStack Barbican as the storage for certificates. OpenStack Barbican is a REST API designed for the secure storage, provisioning, and management of secrets such as passwords, encryption keys, and X.509 certificates.

The following is an example CLI to store certificates in Barbican:

- barbican --os-identity-api-version 2.0 secret store --payload-content-type='text/plain' --name='certificate' --payload="$(cat server.crt)"

For more information about OpenStack Barbican, see: https://wiki.openstack.org/wiki/Barbican.

Neutron Load-Balancer Creation

Note

The following procedure is written using the Neutron LBaaS plugin v1.0. Starting with the OpenStack Train release, neutron-lbaas is replaced by Octavia.

The following is an example of Neutron load-balancer creation:

OpenStack Octavia LBaaS

Using Octavia Load-Balancer

Contrail Networking Release 2005 supports Octavia as LBaaS. The deployment supports RHOSP and Juju platforms.

With Octavia as LBaaS, Contrail Networking is only maintaining network connectivity and is not involved in any load balancing functions.

For each OpenStack load balancer creation, Octavia launches a VM known as amphora VM. The VM starts the HAPROXY when listener is created for the load balancer in OpenStack. Whenever the load balancer gets updated in OpenStack, amphora VM updates the running HAPROXY configuration. The amphora VM is deleted on deleting the load balancer.

Contrail Networking provides connectivity to amphora VM interfaces. Amphora VM has two interfaces; one for management and the other for data. The management interface is used by the Octavia services for the management communication. Since, Octavia services are running in the underlay network and amphora VM is running in the overlay network, SDN gateway is needed to reach the overlay network. The data interface is used for load balancing the traffic.

If the load balancer service is exposed to public, you must create the load balancer VIP in the public subnet. The load balancer members can be in the public or private subnet.

You must create network policy between public network and private network if the load balancer members are in the private network.

Octavia Load-Balancer Creation

The following is an example of Octavia load-balancer creation:

Release History Table
Release
Description
Contrail Networking Release 2005 supports Octavia as LBaaS.