Linux Cloud-Native Ops Stack

Jun 9, 2026 · Databases

Zero‑Downtime Redis Cluster Expansion in Production

This guide details a step‑by‑step, zero‑downtime expansion of a 3‑master‑3‑slave Redis Cluster to a 4‑master‑4‑slave setup, covering node standardization, network checks, big‑key handling, full backups, monitoring, slot migration planning, progressive migration methods, replica addition, post‑expansion validation, rollback procedures, and practical lessons learned.