The article discusses the migration of over 30 Kubernetes clusters to Terraform, detailing the challenges faced with previous tools like Sceptre and AWS CDK, and outlining a structured, iterative approach to the transition. Key strategies included automating processes, ensuring safety during rollbacks, and emphasizing hands-on knowledge transfer over traditional documentation. The authors share insights on tooling, risk management, and team collaboration throughout the migration journey.

Uber successfully migrated its stateless container orchestration platform from Apache Mesos to Kubernetes, leveraging the industry's standard for enhanced stability and functionality. The migration involved overcoming significant challenges related to scale, integration, and feature parity while implementing custom solutions tailored to Uber's specific requirements. Future blog posts will detail additional migrations within Uber's architecture.

Yahoo Mail is migrating its application to Google Cloud using a multi-tenant Google Kubernetes Engine (GKE) platform, incorporating a combination of lift-and-shift and strategic replatforming. The design emphasizes high availability, efficient workload management, and robust security measures, while addressing technical challenges throughout the migration process. The collaboration between Yahoo and Google aims to optimize the mail system for future demands.

The article discusses the transition from using Cluster Autoscaler to Karpenter for managing Kubernetes clusters, highlighting the benefits of Karpenter such as improved efficiency and cost-effectiveness. It provides insights into the features of Karpenter and practical steps for migration, emphasizing its dynamic provisioning capabilities.

Uber successfully upgraded over 2 million Apache Spark applications from version 2.4 to 3.3, leveraging innovative automation tools like Iron Dome and Polyglot Piranha to manage the complex migration process. The transition resulted in significant efficiency gains, including a 50% reduction in runtime and resource usage, and paved the way for future upgrades and optimizations.

Migrating Amazon EKS from version 1.29 to 1.32 involved careful planning and execution, focusing on upgrading Terraform modules, transitioning to Amazon Linux 2023, and implementing a blue/green deployment strategy to minimize downtime. The process highlighted the importance of addressing breaking changes, updating add-ons, and validating instance types to ensure a smooth upgrade across four clusters. Overall, the upgrade was completed in two weeks with minimal disruptions and enhanced security and performance.