OS Patching on Ubuntu for Multi-Node Environment

This section provides a step-by-step guide for applying OS patches in an Ubuntu environment while minimizing downtime in a multi-node, multi-data center (DC) Kubernetes setup. By following the rolling update procedure, OS patches can be applied without causing significant disruption to the overall environment. Ensure the GUI load balancer is properly configured to distribute traffic during the patching process to maintain high availability. As per our high-availability (HA) claim, a brief downtime of approximately 5 minutes is expected when the secondary DC nodes are down.