Maintaining a healthy Kubernetes cluster requires understanding key failure modes and recovery strategies. This article covers three critical areas: node eviction under CPU and memory pressure, CoreDNS resolution jitter that can cause service disruptions, and cluster self-healing mechanisms that restore stability. It provides actionable steps for diagnosing and resolving these issues, from adjusting resource quotas to tuning DNS configurations. For SREs and DevOps engineers, this content offers a structured approach to cluster lifecycle management, helping prevent downtime and improve resilience. The evergreen nature of these topics makes this a valuable reference for production environments.
A practical guide to Kubernetes cluster maintenance covering node eviction, CoreDNS issues, and self-healing.