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+# Cinder CSI Driver
+
+Cinder CSI driver allows you to provision volumes over an OpenStack deployment. The Kubernetes historic in-tree cloud provider is deprecated and will be removed in future versions.
+
+To enable Cinder CSI driver, uncomment the `cinder_csi_enabled` option in `group_vars/all/openstack.yml` and set it to `true`.
+
+To set the number of replicas for the Cinder CSI controller, you can change `cinder_csi_controller_replicas` option in `group_vars/all/openstack.yml`.
+
+You need to source the OpenStack credentials you use to deploy your machines that will host Kubernetes: `source path/to/your/openstack-rc` or `. path/to/your/openstack-rc`.
+
+Make sure the hostnames in your `inventory` file are identical to your instance names in OpenStack. Otherwise [cinder](https://docs.openstack.org/cinder/latest/) won't work as expected.
+
+If you want to deploy the cinder provisioner used with Cinder CSI Driver, you should set `persistent_volumes_enabled` in `group_vars/k8s_cluster/k8s_cluster.yml` to `true`.
+
+You can now run the kubespray playbook (cluster.yml) to deploy Kubernetes over OpenStack with Cinder CSI Driver enabled.
+
+## Usage example
+
+To check if Cinder CSI Driver works properly, see first that the cinder-csi pods are running:
+
+```ShellSession
+$ kubectl -n kube-system get pods | grep cinder
+csi-cinder-controllerplugin-7f8bf99785-cpb5v   5/5     Running   0          100m
+csi-cinder-nodeplugin-rm5x2                    2/2     Running   0          100m
+```
+
+Check the associated storage class (if you enabled persistent_volumes):
+
+```ShellSession
+$ kubectl get storageclass
+NAME         PROVISIONER                AGE
+cinder-csi   cinder.csi.openstack.org   100m
+```
+
+You can run a PVC and an Nginx Pod using this file `nginx.yaml`:
+
+```yml
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: csi-pvc-cinderplugin
+spec:
+  accessModes:
+  - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+  storageClassName: cinder-csi
+
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - image: nginx
+    imagePullPolicy: IfNotPresent
+    name: nginx
+    ports:
+    - containerPort: 80
+      protocol: TCP
+    volumeMounts:
+      - mountPath: /var/lib/www/html
+        name: csi-data-cinderplugin
+  volumes:
+  - name: csi-data-cinderplugin
+    persistentVolumeClaim:
+      claimName: csi-pvc-cinderplugin
+      readOnly: false
+```
+
+Apply this conf to your cluster: ```kubectl apply -f nginx.yml```
+
+You should see the PVC provisioned and bound:
+
+```ShellSession
+$ kubectl get pvc
+NAME                   STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
+csi-pvc-cinderplugin   Bound    pvc-f21ad0a1-5b7b-405e-a462-48da5cb76beb   1Gi        RWO            cinder-csi     8s
+```
+
+And the volume mounted to the Nginx Pod (wait until the Pod is Running):
+
+```ShellSession
+kubectl exec -it nginx -- df -h | grep /var/lib/www/html
+/dev/vdb        976M  2.6M  958M   1% /var/lib/www/html
+```
+
+## Compatibility with in-tree cloud provider
+
+It is not necessary to enable OpenStack as a cloud provider for Cinder CSI Driver to work.
+Though, you can run both the in-tree openstack cloud provider and the Cinder CSI Driver at the same time. The storage class provisioners associated to each one of them are differently named.
+
+## Cinder v2 support
+
+For the moment, only Cinder v3 is supported by the CSI Driver.
+
+## More info
+
+For further information about the Cinder CSI Driver, you can refer to this page: [Cloud Provider OpenStack](https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/using-cinder-csi-plugin.md).