CloudStack CSI Driver

This repository provides a Container Storage Interface (CSI) plugin for Apache CloudStack.

Usage with Kubernetes

Requirements

• Minimal Kubernetes version: v1.17

• The Kubernetes cluster must run in CloudStack. Tested only in a KVM zone.

• A disk offering with custom size must be available, with type "shared".

• In order to match the Kubernetes node and the CloudStack instance, they should both have the same name. If not, it is also possible to use cloud-init instance metadata to get the instance name: if the node has cloud-init enabled, metadata will be available in /run/cloud-init/instance-data.json; you should then make sure that /run/cloud-init/ is mounted from the node.

• Kubernetes nodes must be in the Root domain, and be created by the CloudStack account whose credentials are used in configuration.

Configuration

Create the CloudStack configuration file cloudstack.ini.

It should have the following format, defined for the CloudStack Kubernetes Provider:

[Global]
api-url = <CloudStack API URL>
api-key = <CloudStack API Key>
secret-key = <CloudStack API Secret>
ssl-no-verify = <Disable SSL certificate validation: true or false (optional)>

Create a secret named cloudstack-secret in namespace kube-system:

kubectl create secret generic \
  --namespace kube-system \
  --from-file ./cloudstack.ini \
  cloudstack-secret

If you have also deployed the CloudStack Kubernetes Provider, you may use the same secret for both tools.

Deployment

kubectl apply -f https://github.com/apalia/cloudstack-csi-driver/releases/latest/download/manifest.yaml

Creation of Storage classes

Manually

A storage class can be created manually: see example.

The provisioner value must be csi.cloudstack.apache.org.

The volumeBindingMode must be WaitForFirstConsumer, in order to delay the binding and provisioning of a PersistentVolume until a Pod using the PersistentVolumeClaim is created. It enables the provisioning of volumes in respect to topology constraints (e.g. volume in the right zone).

The storage class must also have a parameter named csi.cloudstack.apache.org/disk-offering-id whose value is the CloudStack disk offering ID.

Using cloudstack-csi-sc-syncer

The tool cloudstack-csi-sc-syncer may also be used to synchronize CloudStack disk offerings to Kubernetes storage classes.

More info...

Usage

Example:

kubectl apply -f ./examples/k8s/pvc.yaml
kubectl apply -f ./examples/k8s/pod.yaml

Building

To build the driver binary:

make build-cloudstack-csi-driver

To build the container images:

make container

See also

• CloudStack Kubernetes Provider - Kubernetes Cloud Controller Manager for Apache CloudStack
• CloudStack documentation on storage
• CSI (Container Storage Interface) specification

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Copyright 2021 Apalia SAS

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