Kubernetes and the Dragons in Linux Kernel vs. Userspace Tools - Jussi Nummelin

This talk examines the challenges that arise during routine Linux OS updates on Kubernetes nodes, highlighting issues like network rule interruptions caused by iptables, difficulties with modprobe related to compressed kernel modules, and complications with ipset following kernel upgrades. The speaker shares real-world experiences with these compatibility challenges, often referred to as "dragon encounters," which affect Kubernetes stability due to the legacy nature of these low-level tools. Participants will gain insights into troubleshooting techniques and strategies designed to maintain the smooth operation of Kubernetes clusters. Jussi Nummelin brings over a decade of experience in cloud-native technologies and currently works at Mirantis, focusing on the k0s kube distribution and its associated tools.