Q: What’s your approach to disaster recovery for stateful applications running on containers?
Comprehensive disaster recovery framework for stateful containerized applications running on Kubernetes, achieving strict RTO and RPO targets across cloud regions.
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🛠️ Production Runbook & Step-by-Step Resolution
Decouple Heavy State from Kubernetes Compute Where Feasible
Evaluate workload state requirements. For primary relational databases, prefer managed cloud engines with native cross-region replication (AWS Aurora Global Database / Azure SQL Auto-Failover Groups) over running self-managed monolithic databases on EBS/PVCs.
CSI Volume Snapshot Replication & Velero Automation
For workloads requiring persistent volumes (PVCs), implement the Kubernetes Container Storage Interface (CSI) Snapshotter coupled with Velero. Take hourly volume snapshots and sync metadata manifests to cross-region S3/Blob storage.
# Velero scheduled backup with CSI volume snapshotting
velero schedule create hourly-stateful-backup \
--schedule="0 * * * *" \
--include-namespaces production \
--snapshot-volumes \
--volume-snapshot-locations defaultActive-Passive Warm Standby Cluster Configuration
Maintain a warm standby Kubernetes cluster in a secondary cloud region. Use GitOps (ArgoCD) to maintain identical manifests across both clusters. In disaster declaration, Velero restores PVC volume snapshots into the secondary cluster and ArgoCD scales StatefulSets from 0 to target replicas.
Execute Automated Failover Drills & RPO/RTO Validation
Conduct quarterly automated disaster recovery drills. Validate that recovery point objectives (RPO < 15 minutes) and recovery time objectives (RTO < 30 minutes) are met without data corruption.
- Externalize relational data to managed multi-region cloud services (Aurora Global / Azure SQL Failover Groups).
- Use CSI volume snapshots and Velero to replicate PersistentVolume data and cluster manifests to secondary regions.
- Maintain a warm standby Kubernetes cluster with scaled-to-zero replicas via ArgoCD.
- Conduct quarterly automated failover fire drills to strictly validate RTO and RPO metrics.