Container Storage Interface

The official Container Storage Interface (CSI) for Flow Swiss and Cloudbit block storage volumes. This plugin enables you to use our block storage devices within Kubernetes or any other Container Orchestrator.

Deploying on Kubernetes

If you use a Managed Kubernetes Cluster, the CSI driver will be deployed automatically, and you do not have to setup anything. If you however choose to host your own cluster on our Compute Platform, you need to apply the following steps to deploy this driver.

1. Create an API token

Go into our portal and navigate to the Application Tokens section. Here you can create a new one by giving it a name. Copy the generated token and store it somewhere safe.

• Create an application token on Flow Swiss
• Create an application token on Cloudbit

2. Create secret

Create a secret containing the token in a namespace of your choice on your cluster.

kubectl create secret generic flow \
	--from-literal=base=[environment-url] \
	--from-literal=token=[application-token]

Replace the application-token placeholder with the previously generated API token. For the placeholder environment-url, enter the URL of the system you are using (https://api.flow.swiss/ or https://api.cloudbit.ch/)

The same configuration can be achieved through the following yaml configuration:

apiVersion: v1
kind: Secret
metadata:
  name: flow
data:
  base: [environment-url-base64]
  token: [application-token-base64]

3. Deploy the CSI plugin

All needed kubernetes configurations can be found in this repository in the deployments directory. Choose the desired version and apply it using the kubectl command.

kubectl apply -f deployments/kubernetes/VERSION

4. Verify installation

To verify your installation you can create a simple volume claim by applying the following configuration.

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: csi-test
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: flow-block-storage

If everything was successful you can check that the volume has been created by running the following command.

$ kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM              STORAGECLASS         REASON   AGE
pvc-6d28a5c7-43f6-4be8-afb7-ab0dca6ed48b   1Gi        RWO            Delete           Bound    default/csi-test   flow-block-storage            7s