Engineers may be tasked with rolling out a new Container Networking Interface (CNI) to their environment. Sounds easy enough! Delete the old one, deploy the new one. Or maybe just deploy a brand new cluster! What if... there was another way? The talk will show how a live, in-place migration of the CNI plugin was performed in production clusters. It will highlight a few approaches that were considered, and what approach was eventually selected before proceeding with the migration process. Lastly, the procedure and steps taken to execute this migration will be shared, along with any lessons learned.
