Archived - Use KEDA Instead

This project has been depreacted in place opf using KEDA along with the use of PreStop code:

• https://www.linkedin.com/pulse/scaling-kubernetes-selenium-grid-keda-brandon-wolfe/

Horizontal Pod Scaler for Selenium Grid Kubernetes

This is a small spring boot application which can be used to auto scale the selenium browser pods running inside a kubernetes cluster.

It can give an elasticity to the K8s based selenium grid where the browser nodes can be scaled up/down on demand basis.

To make sure this application does not end up sucking the entire compute power of your cluster, we have a lower and upper cap beyond which the scale will never go.

Modified from this article and source: https://sahajamit.medium.com/spinning-up-your-own-auto-scalable-selenium-grid-in-kubernetes-part-2-15b11f228ed8 https://github.com/sahajamit/selenium-grid-autoscaler

Configurable Properties (found in /src/main/resources/application.properties)

gridUrl=http://<Grid_URL_Or_IP>:<Grid_Port>/grid/console
k8s_api_url=https://<Kubernetes HOST>/v3/project/path_to_chrome_deployment

# This property will control the maximum scale to which the browser pods can be scaled up.
node.chrome.max.scale.limit=2

# This property will decide the minimum number of browser pods you want to run all the time. Recommended value is 1.
node.chrome.min.scale.limit=1

k8s.token=<Kubernetes Service Account Token>
grid_scale_check_frequency_in_sec=10
grid_daily_cleanup_cron=0 10 10 * * ?
logging_level_com_sahajamit_k8s=DEBUG

Quick start

• Docker is required: https://docs.docker.com/docker-for-windows/install/
• Modify the application.properties with what you need
  • All of this can be supplied as environment variables as well
  • Of note the API Bearer token will be required for this to work
• Build the java application
• Run the following to build the container (from the root repo directory):
  • docker build -t selenium-grid-autoscaler .
• Run the following to start the container:
  • docker run selenium-grid-autoscaler