Sohu Tech Products

Dec 22, 2021 · Cloud Native

Zero‑Downtime Upgrade of Large‑Scale Kubernetes Clusters from v1.10 to v1.17

This article details the challenges, strategies, and step‑by‑step procedures for upgrading a 1,000‑node Kubernetes cluster from version 1.10 to 1.17 without service interruption, covering compatibility checks, in‑place versus replacement upgrades, container‑restart avoidance, pod eviction handling, and TCP connection issues.