Scaling a Kubernetes Selenium Grid with KEDA

Fri, 19 Aug 2022 00:00:00 +0000

The Issue

If you have any experience with Selenium Grid and Kubernetes you will probably run into an issue with scaling. Kubernetes (K8S) works wonders for scaling up and down applications based on their CPU and Memory usage, but it is not so straightforward when it comes down to applications like Selenium Grid.

The issue is described quite well in this blog post. But in short, the Horizontal Pod AutoScaler (HPA) that is built into Kubernetes checks (by default) for resource consumption to determine if a deployment needs to be scaled up or down. This becomes an issue for Selenium Grid for a couple reasons:

Keda on Selenium

Scaling a Kubernetes Selenium Grid with KEDA

The Issue