102 lines
3.5 KiB
Markdown
102 lines
3.5 KiB
Markdown
# Cinder CSI Driver
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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.
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To enable Cinder CSI driver, uncomment the `cinder_csi_enabled` option in `group_vars/all/openstack.yml` and set it to `true`.
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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`.
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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`.
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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.
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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`.
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You can now run the kubespray playbook (cluster.yml) to deploy Kubernetes over OpenStack with Cinder CSI Driver enabled.
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## Usage example
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To check if Cinder CSI Driver works properly, see first that the cinder-csi pods are running:
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```ShellSession
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$ kubectl -n kube-system get pods | grep cinder
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csi-cinder-controllerplugin-7f8bf99785-cpb5v 5/5 Running 0 100m
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csi-cinder-nodeplugin-rm5x2 2/2 Running 0 100m
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```
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Check the associated storage class (if you enabled persistent_volumes):
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```ShellSession
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$ kubectl get storageclass
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NAME PROVISIONER AGE
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cinder-csi cinder.csi.openstack.org 100m
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```
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You can run a PVC and an Nginx Pod using this file `nginx.yaml`:
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```yml
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---
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: csi-pvc-cinderplugin
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spec:
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accessModes:
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- ReadWriteOnce
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resources:
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requests:
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storage: 1Gi
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storageClassName: cinder-csi
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx
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spec:
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containers:
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- image: nginx
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imagePullPolicy: IfNotPresent
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name: nginx
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ports:
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- containerPort: 80
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protocol: TCP
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volumeMounts:
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- mountPath: /var/lib/www/html
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name: csi-data-cinderplugin
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volumes:
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- name: csi-data-cinderplugin
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persistentVolumeClaim:
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claimName: csi-pvc-cinderplugin
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readOnly: false
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```
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Apply this conf to your cluster: ```kubectl apply -f nginx.yml```
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You should see the PVC provisioned and bound:
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```ShellSession
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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csi-pvc-cinderplugin Bound pvc-f21ad0a1-5b7b-405e-a462-48da5cb76beb 1Gi RWO cinder-csi 8s
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```
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And the volume mounted to the Nginx Pod (wait until the Pod is Running):
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```ShellSession
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kubectl exec -it nginx -- df -h | grep /var/lib/www/html
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/dev/vdb 976M 2.6M 958M 1% /var/lib/www/html
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```
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## Compatibility with in-tree cloud provider
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It is not necessary to enable OpenStack as a cloud provider for Cinder CSI Driver to work.
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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.
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## Cinder v2 support
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For the moment, only Cinder v3 is supported by the CSI Driver.
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## More info
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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).
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