Longhorn Cloud-Native Storage

Longhorn is a lightweight, reliable, and powerful distributed block storage system for Kubernetes, designed to be easy to deploy and manage while providing enterprise-grade data persistence for stateful workloads. Created by Rancher Labs (later acquired by SUSE) in 2017 by Sheng Yang and Darren Shepherd, Longhorn was donated to the CNCF Sandbox in 2019 and graduated as a CNCF Incubating project in 2023, with over 6,000 stars as of 2026. Key features include: distributed block storage (replicating block storage across multiple nodes for high availability, with configurable replica count per volume), CSI compliance (full Container Storage Interface implementation supporting dynamic provisioning, snapshotting, cloning, expansion, and raw block devices), Kubernetes-native (deployed as a Kubernetes operator and daemonset, requiring no external dependencies beyond Kubernetes itself), volume snapshots and backups (point-in-time snapshots stored locally and backups to S3-compatible object storage including AWS S3, MinIO, and Ceph RADOS), volume cloning (creating new volumes from existing volumes or snapshots for data duplication), volume expansion (online resizing of Persistent Volume Claims without downtime), cross-cluster disaster recovery (backing up and restoring volumes across different Kubernetes clusters via S3-compatible storage), thin provisioning (allocating storage on demand, only consuming physical space as data is written), storage tiering (configuring replica placement on specific nodes and disks for performance optimization), recurring snapshots and backups (scheduled snapshot and backup policies per volume or per StorageClass), node drain support (gracefully migrating volume replicas during node maintenance), monitoring and alerts (Prometheus-compatible metrics for volume health, replica status, and storage capacity), and Helm-based deployment (simple installation via Helm chart or Rancher App Marketplace).