Virtual Event
May 4 - May 7
Learn More and Register to Attend

The Sched app allows you to build your schedule but is not a substitute for your event registration. You must be registered for KubeCon + CloudNativeCon Europe 2021 Virtual to participate in the sessions. If you have not registered but would like to join us, please go to the event registration page to purchase a registration.

Please note: This schedule is automatically displayed in Central European Summer Time (UTC +2). To see the schedule in your preferred timezone, please select from the drop-down menu to the right, above "Filter by Date." The schedule is subject to change.

Back To Schedule
Friday, May 7 • 14:35 - 15:10
Discontiguous CIDRs for Dynamic Cluster Scaling - Rahul Joshi & Sudeep Modi, Google

Sign up or log in to save this to your schedule, view media, leave feedback and see who's attending!

Feedback form is now closed.
Users want more out of their existing clusters. As demand increases, they would like to increase the size of their clusters by adding more nodes and pods (scaling horizontally). One of the key limitations in doing this is immutability of IP addresses. Providing each additional node and pod an IP, quickly exhausts users’ initial IP allocations. They must resort to optimizing IP addresses in their existing clusters, or pre-emptively over-allocating IP addresses during cluster creation time. With Discontiguous Pod and Node CIDRs, IP addresses become a mutable resource that can be added post-cluster creation thereby helping in the growing the cluster dynamically. Adding support for disjoint CIDRs also allows fitting clusters into fragmented IP spaces, a problem commonly faced by enterprise customers. This talk will describe how GKE solves the problem for customers and the lessons learnt along the way. This talk also proposes ideas on how to solve this natively in Kubernetes.

avatar for Rahul Joshi

Rahul Joshi

Software Engineer, Google
Rahul is a Software Engineer at Google, working on Kubernetes and Google Kubernetes Engine (GKE) Networking. Previously, he worked on App Engine and Cloud Functions (GCP’s Serverless offerings), and as a SRE supporting GKE.
avatar for Sudeep Modi

Sudeep Modi

Software Engineer, Google
I am a Software Engineer at Google, working on the Google Kubernetes Engine (GKE) Networking team. I have worked in the networking industry for about 12 years. I started my career working on the Linux kernel networking stack at Riverbed Technology. I spent a lot of fun years working... Read More →

Friday May 7, 2021 14:35 - 15:10 CEST
Networking Theater