Running Databases on Kubernetes

Kelsey Hightower's discussion on running databases on Kubernetes highlights the challenges and misconceptions associated with using Kubernetes for stateful workloads such as databases. While Kubernetes offers cloud-native primitives like StatefulSets, PersistentVolumes, and PersistentVolumeClaims to support stateful applications, these are merely building blocks that require additional orchestration for full functionality. The discussion emphasizes that Kubernetes does not automatically provide complex lifecycle features typical of managed database services, leading to the necessity for Day 2 Operations, which include tasks like backups, restores, replication, and high availability. Despite its complexities, Kubernetes offers benefits such as programmatic workload management and multi-cloud flexibility, making it appealing for organizations willing to invest in the expertise needed to implement these advanced operations. The text elaborates on how Kubernetes' operator model and tools like Helm can support database automation, though they require significant effort and expertise to implement effectively. Ultimately, the choice to run databases on Kubernetes should be informed by the specific needs and resources of an organization, as it can offer great flexibility and control but demands a high level of technical investment and understanding.