Configure Rook Ceph Storage in Kubernetes

Configuring Rook Ceph Storage in Kubernetes

Rook is an open-source project that brings file, block, and object storage systems to Kubernetes. It leverages the power of Ceph to provide scalable and reliable persistent storage solutions in cloud-native environments. This guide will help you set up Rook Ceph storage in your Kubernetes cluster.

Prerequisites

Have a Kubernetes cluster up and running. You can read how to configure Multus CNI in Kubernetes for advanced networking setups.
Ensure kubectl is configured on your workstation (Official site).
Admin access to your Kubernetes cluster.
A basic understanding of Kubernetes resources and storage.

Step-by-Step Installation Guide

Step 1: Install Rook Operator

Start by installing the latest version of the Rook operator. This can be done by applying Rook’s common and operator manifests.

kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/common.yaml
kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/operator.yaml

Step 2: Deploy Ceph Cluster

Next, create Ceph cluster resources. Modify the cluster.yaml in the Rook repository to suit your specifications or use the default settings.

kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/cluster.yaml

Step 3: Validate the Cluster

Ensure the Ceph cluster is healthy. Run the following command to check the cluster status:

kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph status

Step 4: Create Ceph Block Pool

Ceph block pools are required to provide block storage. Create a block pool by customizing pool.yaml provided by Rook examples.

kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/pool.yaml

Step 5: Provision StorageClass

Define a StorageClass that references the block pool you created to dynamically provision Persistent Volumes (PVs).

kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/storageclass.yaml

Troubleshooting

If you encounter issues during the setup, consider the following tips:

Verify the Rook operator logs for errors using kubectl logs.
Ensure network policies are not restricting Rook services. See related guides like Kubernetes Network Policies.
Examine Ceph and Rook operator resources for status clues.

Checklist

Install Rook Operator
Deploy and validate Ceph Cluster
Create and configure Ceph Block Pool
Provision StorageClass
Monitor resources for troubleshooting

With these steps, you should have a functional Rook Ceph storage solution integrated with your Kubernetes environment. This setup offers a robust and scalable storage architecture for production workloads.