Financial Firm Upgrades Amazon EKS Cluster Without Downtime Using Automated Lifecycle Tools

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A global financial services firm successfully upgraded its Amazon EKS cluster from version 1.27 to 1.28 without causing any customer-facing incidents. New EKS lifecycle tooling decoupled the control-plane upgrade from node replacement and introduced automated pre-flight checks for addon compatibility and IAM permissions. The team used a phased, surge-based node rollout that maintained at least 30 percent capacity in every availability zone, keeping request latency within SLO targets throughout the four-hour window. Compliance tools including Kyverno policies ran continuously during the rollout, surfacing any violations in real time rather than during post-upgrade audits. The operation, which previously required two full weekends and ten on-call engineers, was completed within a standard change window.

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