Define Storageclass

Introduction

Dynamic Volume Provisioning allows storage volumes to be created on-demand. StorageClass should be pre-created to define which provisioner should be used and what parameters should be passed when dynamic provisioning is invoked.

Define Storage Class

Copy/Paste the following commands into your Cloud9 Terminal.

cat << EoF > ${HOME}/environment/ebs_statefulset/mysql-storageclass.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: mysql-gp2
provisioner: ebs.csi.aws.com # Amazon EBS CSI driver
parameters:
  type: gp2
  encrypted: 'true' # EBS volumes will always be encrypted by default
volumeBindingMode: WaitForFirstConsumer # EBS volumes are AZ specific
reclaimPolicy: Delete
mountOptions:
- debug
EoF

You can see that:

  • The provisioner is ebs.csi.aws.com.
  • The volume type is General Purpose SSD volumes (gp2).
  • The encrypted parameter will ensure the EBS volumes are encrypted by default.
  • The volumeBindingMode is WaitForFirstConsumer to ensure persistent volume will be provisioned after Pod is created so they reside in the same AZ

Create storageclass mysql-gp2 by following command.

kubectl create -f ${HOME}/environment/ebs_statefulset/mysql-storageclass.yaml

You can verify the StorageClass and its options with this command.

kubectl describe storageclass mysql-gp2


Name:                  mysql-gp2
IsDefaultClass:        No
Annotations:           <none>
Provisioner:           ebs.csi.aws.com
Parameters:            encrypted=true,type=gp2
AllowVolumeExpansion:  <unset>
MountOptions:
  debug
ReclaimPolicy:      Delete
VolumeBindingMode:  WaitForFirstConsumer
Events:             <none>

Below is a preview of how the storageClassName will be used in defining the StatefulSet. We will specify mysql-gp2 as the storageClassName in volumeClaimTemplates at “Create StatefulSet” section later.


volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: ["ReadWriteOnce"]
      storageClassName: mysql-gp2
      resources:
        requests:
          storage: 10Gi