IntroductionWe would like to present the work, changes, and features we have done this cycle. We have worked very hard, and we would like to show off some of our work.
What Did We Do?In the past half a year, we have finished the following features:
- Trunk ports (VLAN aware VMs)
- Service Health Report
- Distributed SNAT
What's Next?This is what we plan to do for Queens. If you want something that isn't here, let us know!
- Kuryr Integration
- RPM and DEB Packaging
- LBaaS (Dragonflow native and distributed)
- L3 Flavour
- Troubleshooting Tools
- Multicast and IGMP
Contribution by Companies (Resolved bugs)
Lines of Code by Contributors
Filed Bugs, by Compay:
What Was Done
Dragonflow now supports IPv6. This means that virtual machines that are configured on IPv6 subnets can communicate with each other. IPv6 routing also works, so they don't even have to be on the same network. Security groups also work, so you can create IPv6-based micro-segmentation.
If there is also an IPv6 provider network, these VMs can communicate with the outside world.
Note that since NAT is supposed to be less used in IPv6, it was not implemented.
Trunk Ports (VLAN aware VMs)https://docs.openstack.org/developer/dragonflow/specs/vlan_aware_vms.html
In container scenarios, a virtual machine with a single virtual network card hosts multiple containers. It tags each container's traffic with a VLAN tag, and then Dragonflow can know to which (virtual) port the traffic belongs. Incoming traffic tagged with the container's VLAN tag is forwarded to the container.
Dragonflow now supports this scenario. With trunk ports, virtual sub-ports can be defined to have a segmentation type and ID, and have a completely different network and subnet than its parent.
Since now anything can sit on the network (virtual machine, container, or even an application inside a network namespace), we will refer to all of them as Network Elements.
A few words regarding implementation: Every port in Dragonflow is tagged in an OpenFlow register. Specifically, reg6 contains an internal ID belonging to the source port.
Dragonflow detects the VLAN tag on the packet from a relevant logical port. It untags the packet, and changes reg6 to the logical subport.
To emphasise the container networking angle, see the Kuryr-Kubernetes blog post: http://www.dragonflow.net/2017/09/kubernetes-container-services-at-scale.html. It discusses the Kuryr integration as well.
Service Function Chaining allows the tenant to place Service Functions along the network path between network elements. A service function can be anything - e.g. firewall, deep packet inspection device, or VOIP codec.
A blog post specifically for SFC has been published here:
Service Health Reporthttps://blueprints.launchpad.net/dragonflow/+spec/services-status
It is very important to know which running services are still... running. This is implemented in the Service Health Report feature. Every Dragonflow service now reports its health to the database.
This way you can tell if a service process has died. There isn't a user interface for this yet, but the underlying data is in place.
Border Gateway Protocol (BGP) is a standardized gateway protocol designed to exchange routing and reachability information among autonomous systems.
BGP dynamic routing in OpenStack enables advertisement of self-service network prefixes to physical network devices that support BGP, thus removing the conventional dependency on static routes.
Distributed SNAT is a novel implementation for SNAT that allows it to be fully distributed. This means that no network node is needed. The entire feature is contained within the compute node relevant to the network element using it.
For more information on exactly how it works, see this post: http://www.dragonflow.net/2017/06/distributed-snat-examining-alternatives.html
What Is Yet To Come
Kuryr IntegrationKuryr allows container networking (e.g. Docker, Kubernetes) to be defined using the Neutron API. We want to make sure Dragonflow supports being deployed and used this way.
It is worth mentioning that external LBaaS solutions such as HA Proxy and Octavia already work with Dragonflow. They are used to support Kubernetes services.
RPM and DEB PackagingCurrently, the only installation method is pip. This is not good enough for production. RPM (for RedHat based distributions) and DEB (For Debian based distribution) packages are a must-have for any mature project.
Dragonflow's motto is that everything should be distributed. Bearing that in mind, we believe that we can improve LBaaS performance by implementing it in a distributed manner. Actual implementation should be pushed as far down as it would go (i.e. implement using OpenFlow first if possible, and push it higher-up only if necessary).
Dragonflow is becoming very feature rich, but not all the features are wanted in every deployment. In some cases, only Dragonflow's L3 features (e.g. Distributed SNAT) are needed. Allowing Dragonflow to be deployed as an L3 agent allows Dragonflow to be used with greater flexibility, letting deployers take exactly the features they need.
Troubleshooting cloud networking is a known pain point. It pains developers and operators alike. If there is a problem in the network, you need to quickly find the source of the problem, and quickly identify who can fix it the fastest.
We want to answer this need, by developing troubleshooting tools that will be able to visually show where the network fails, and why.
Sometimes, security groups are just not enough. In some cases, the user wants to define a firewall inside their virtual network. The most logical place to put the firewall implementation is on the wire, i.e. directly in the pipeline the packet passes.
tcpdump is usually the first tool I go to when I don't understand why my network application isn't working. Sometimes even before ping. TAPaaS allows cloud users to have a similar functionality. Implementing this service will go a long way to help users understand why their application isn't working right.
Multicast and IGMPhttps://docs.openstack.org/developer/dragonflow/specs/igmp_application_and_multicast_support.html
Multicast communication has many uses. Its power that its both efficient, and specific. However, none of these strengths come into play in the current multicast implementation. This can be improved greatly.
ConclusionAs you can see, we have a lot planned for the next cycle. It would be great if you could join us to suggest features, priorities, or even patches!
Stay tuned for information regarding the vPTG for Queens.
In the meantime, you can find us on the IRC, on Freenode, in #openstack-dragonflow !