From Disaster to Recovery: A Practical Case Study on Kubernetes etcd Backups

In Kubernetes (K8s) clusters, etcd functions as the "brain." It stores all state data for the entire cluster ranging from Pod configurations and service registrations to network policy definitions, making the cluster's stability entirely dependent on etcd. Any loss or corruption of etcd data can paralyze the cluster and severely impact business operations. However, real world operations are fraught with unexpected events such as human error, hardware failure, and network anomalies, all of which threaten data integrity. Therefore, building a reliable backup mechanism, specifically periodic automated backups, is a critical link in ensuring K8S cluster stability and business continuity. This article focuses on periodic etcd data backups within a K8S environment. Through a hands-on case study, we will demonstrate how to build an efficient and stable automated backup solution to help O&M personnel navigate data security challenges. 1. Backup Solution Approach While using Ceph RBD or Object