Full-Stack DevOps & Kubernetes

May 28, 2025 · Operations

How to Fix etcd “NOSPACE” Errors in Kubernetes Clusters

When a Kubernetes cluster’s etcd reaches its default 2 GB quota, it triggers a “NOSPACE” alarm that blocks all write operations, causing critical services to fail; this guide explains the root cause, how to diagnose the issue with etcdctl, and step‑by‑step remediation including compaction, defragmentation, and quota expansion.