Kubernetes Ceph RBD volume with CSI driver

In this post I will show you how can you use CEPH RBD with CSI driver for persistent storagi on Kubernetes.

Parst of the Openshift series

• Part1: Install K8S with ansible
• Part2: Install K8S with kubeadm
• Part3: Install ingress to K8S
• Part4: Intall metal-lb with K8S
• Part5: Use ceph persisten volume with K8S

The Container Storage Interface (CSI) is a standard for exposing arbitrary block and file storage storage systems to Kubernetes. Using CSI third-party storage providers can write and deploy plugins exposing storage systems in Kubernetes. Bbefore we begin lets ensure that we have the following requirements:

• Kubernetes cluster v1.14+
• allow-privileged flag enabled for both kubelet and API server

• Running Ceph cluster

  git clone https://github.com/ceph/ceph-csi.git
  cd ceph-csi/deploy/rbd/kubernetes/v1.14+/
  
  kubectl create -f csi-nodeplugin-rbac.yaml
  kubectl create -f csi-provisioner-rbac.yaml
  

  nano csi-config-map.yaml
  ---
  apiVersion: v1
  kind: ConfigMap
  data:
  config.json: |-
  [
    {
      "clusterID": "k8s-ceph",
      "monitors": [
        "192.168.1.31:6790",
        "192.168.1.32:6790",
        "192.168.1.33:6790"
      ]
    }
  ]
  metadata:
  name: ceph-csi-config
  
  
  kubectl create -fcsi-config-map.yaml
  

  kubectl create -f csi-rbdplugin-provisioner.yaml
  kubectl create -f csi-rbdplugin.yaml
  

  ceph auth get-key client.admin|base64
  QVFDTDliVmNEb21I32SHoPxXNGhmRkczTFNtcXM0ZW5VaXlTZEE977==
  
  nano csi-rbd-secret.yaml
  ---
  apiVersion: v1
  kind: Secret
  metadata:
  name: csi-rbd-secret
  namespace: default
  data:
  userID: admin
  userKey: QVFDTDliVmNEb21I32SHoPxXNGhmRkczTFNtcXM0ZW5VaXlTZEE977==
  
  nano rbd-csi-sc.yaml
  ---
  apiVersion: storage.k8s.io/v1
  kind: StorageClass
  metadata:
  name: csi-rbd
  provisioner: rbd.csi.ceph.com
  parameters:
  monitors: 192.168.1.31:6790,192.168.1.32:6790,192.168.1.33:6790
  clusterID: k8s-ceph
  pool: rbd
  imageFeatures: layering
  csi.storage.k8s.io/provisioner-secret-name: csi-rbd-secret
  csi.storage.k8s.io/provisioner-secret-namespace: default
  csi.storage.k8s.io/node-publish-secret-name: csi-rbd-secret
  csi.storage.k8s.io/node-publish-secret-namespace: default
  adminid: admin
  csi.storage.k8s.io/fstype: ext4
  reclaimPolicy: Delete
  mountOptions:
  - discard
  
  kubectl create -f csi-rbd-secret.yaml
  kubectl create -f rbd-csi-sc.yaml
  
  kubectl get storageclass
  NAME      PROVISIONER        AGE
  csi-rbd   rbd.csi.ceph.com   15s
  

  nano raw-block-pvc.yaml
  ---
  apiVersion: v1
  kind: PersistentVolumeClaim
  metadata:
  name: raw-block-pvc
  spec:
  accessModes:
  - ReadWriteMany
  volumeMode: Block
  resources:
  requests:
    storage: 1Gi
  storageClassName: csi-rbd
  
  kubectl create -f raw-block-pvc.yaml
  
  kubectl get pvc
  NAME            STATUS    VOLUME                                  
  raw-block-pvc   Bound     pvc-fd66b4d6-757d-22e9-8f9e-4f86e2356a59