Technology

Rook

A Kubernetes storage orchestrator that deploys and manages Ceph clusters on Kubernetes, providing K8s-native S3-compatible object storage via Ceph's RADOS Gateway.

6 connections 3 resources

Summary

What it is

A Kubernetes storage orchestrator that deploys and manages Ceph clusters on Kubernetes, providing K8s-native S3-compatible object storage via Ceph's RADOS Gateway.

Where it fits

Rook bridges the gap between Kubernetes-native operations and enterprise storage. It automates the deployment, scaling, and lifecycle management of Ceph on K8s — enabling platform teams to offer self-service S3-compatible storage to application developers.

Misconceptions / Traps

Rook is not a storage system itself. It is an operator that manages Ceph on Kubernetes. Operational complexity is still Ceph's complexity — Rook automates deployment, not troubleshooting.
Running Ceph on Kubernetes adds a layer of abstraction that can complicate debugging. Storage issues may manifest as pod failures, PVC errors, or OSD crashes.

Key Connections

depends_on Ceph — orchestrates Ceph clusters
implements S3 API — via Ceph RADOS Gateway
scoped_to Kubernetes Object Provisioning & Policy — K8s-native storage management
solves Vendor Lock-In — self-hosted S3-compatible on Kubernetes

Definition

What it is

A Kubernetes storage orchestrator that deploys and manages Ceph (including its S3-compatible RADOS Gateway) as a native Kubernetes resource using operators and CRDs.

Why it exists

Running Ceph for S3-compatible storage requires significant operational expertise. Rook automates Ceph deployment, scaling, and healing on Kubernetes, making self-hosted S3-compatible storage a declarative, GitOps-managed resource.

Primary use cases

Kubernetes-native S3-compatible storage, automated Ceph management, cloud-native on-premise object storage.

Recent developments

Latest signals

Report if an OSD ID is detected multiple times. GitHub issue reporting OSD ID detection bug in Rook v1.19.2 with Ceph v20.2.0 on Kubernetes 1.35.1. Per GitHub (rook/rook) (2026-03-24).
Releases · rook/rook. Rook v1.19.5 patch release notes with security fixes, CSI updates, OSD improvements, and Helm chart changes. Supported K8s v1.30-v1.35. Per GitHub (rook/rook) (2026-01-20).
Severe Write Performance Degradation with Rook Ceph. GitHub issue documenting severe write performance degradation in Rook Ceph v1.16.5: raw disk 400 MB/s vs PVC 20-60 MB/s. Per GitHub (rook/rook) (2025-03-24).