How to Run Zero-Downtime Kubernetes Upgrades With a Disciplined Process

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Engineer Dr. Samson Tanimawo outlines a structured approach to Kubernetes upgrades that minimises risk and avoids service disruption. The process begins with reading release notes for every minor version and auditing deprecated APIs using tools like pluto or kubent before any upgrade begins. Critical services should be protected with PodDisruptionBudgets, while control plane components and worker nodes must be upgraded sequentially in small batches with health checks in between. Rollbacks are difficult in Kubernetes, so the recommended strategy is to pause upgrades until each batch is confirmed healthy rather than attempting in-place downgrades. Tanimawo argues that teams struggling with upgrades typically lack foundational reliability practices such as test environments and runbooks, and that fixing those gaps makes upgrades routine.

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