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Thursday, March 30 • 16:25 - 17:00
Sched.net: A Network-Aware Kubernetes Scheduler [I] - Akash Gangil & Salvatore Orlando, VMware

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Different workloads have different optimal scheduling requirements. For instance, a video streaming microservice would need higher network bandwidth than a microservice running the codec. Kubernetes exposes an interface to build a custom scheduler. In this talk, we will show how better scheduling decisions can be made with information about the network topology. The scheduler would make pod scheduling decisions as a function of network health, in addition to other resources like cpu and memory predicates used by the default scheduler.

The talk would highlight:
* How kubernetes empowers the users to build their own custom scheduler and challenges that come along with it.
* Why we needed sched.net over the current default scheduler?
* Demonstrate how better scheduling decisions can be made, if the scheduler is also aware of the current network state with a simple demo described below.

Demo setup would consist of kubernetes with OVN as a networking backend using the ovn-kubernetes plugin. It provides a well defined translation between Kubernetes and OVN logical network abstractions. Ex: namespace → logical switch, pod → logical switch port. Sched.net would be implemented by adding a predicate function which would determine “network health” from information gathered from OVN controller.

avatar for Akash Gangil

Akash Gangil

Software Engineer, Uhana
Akash is currently a Sr. Software Engineer at Uhana. Previously, he was a software engineer at Networking and Security Business Unit at VMware. He worked at enabling VMware NSX as a networking fabric for Kubernetes. He recently graduated from Georgia Tech with a focus on Computer Systems and is passionate about middleware and distributed systems.
avatar for Salvatore Orlando

Salvatore Orlando

Staff Engineer, VMware
Salvatore used to be very involved with Openstack Networking. He actually implemented the first version of the Neutron API, then called Quantum. It was so good it had to be re-done from scratch. At some point he decided he made enough damage and left. After spending some time picking colors for painting bike sheds - and shaving yaks - he decided to turn his attention to Kubernetes. | | However, Salvatore is not only known for his wild commits... Read More →

Thursday March 30, 2017 16:25 - 17:00
B 05 - B 06 Berlin Congress Center, Alexanderstraße 11, 10178 Berlin, Germany