Storage Classes for Helm Charts, Operators and Kustomize¶

Storage Classes¶

Storage classes in Kubernetes define the types of storage available for dynamic provisioning of persistent volumes. When using Helm charts, Operators or Kustomize with Omnistrate, you can leverage dynamic provisioning to create volumes of different types based on your application's requirements.

Omnistrate pre-provisions a defined set of storage classes for persistent volumes across different cloud providers, ensuring consistent storage options and optimal performance for your Helm deployments.

When using Compose specifications using storage classes directly is not required.

Pre-Provisioned Storage Classes¶

Omnistrate automatically provisions the following storage classes across different cloud providers:

AWS Storage Classes¶

Storage Class Configuration:

• Volume Binding Mode: WaitForFirstConsumer (default), Immediate (for -immediate variants)
• Reclaim Policy: Delete - volumes are automatically deleted when deployment instances are deleted
• Volume Expansion: Enabled for all AWS storage classes
• Encryption: All volumes are encrypted
• Default: gp3

GCP Storage Classes¶

Storage Class Configuration:

• Volume Binding Mode: WaitForFirstConsumer (default), Immediate (for -immediate variants)
• Reclaim Policy: Delete - volumes are automatically deleted when deployment instances are deleted
• Volume Expansion: Enabled for all GCP storage classes
• Encryption: All volumes are encrypted
• Default: pd-balanced

Azure Storage Classes¶

Storage Class Configuration:

• Volume Binding Mode: WaitForFirstConsumer (default), Immediate (for -immediate variants)
• Reclaim Policy: Delete - volumes are automatically deleted when deployment instances are deleted
• Volume Expansion: Enabled for managed-premium storage classes only
• Encryption: All volumes are encrypted
• Default: managed-premium

Cloud Agnostic Storage Class¶

Omnistrate configures default storage classes for each cloud, if you don't have specific performance requirements you can rely on the default storage class for simplicity.

Using Storage classes on your Helm¶

When deploying Helm charts through Omnistrate, you can specify storage classes in your Helm values to dynamically provision persistent volumes. The storage class determines the type and performance characteristics of the underlying storage.

Example of using storage classes on you Helm Chart¶

# values.yaml
persistence:
  enabled: true
  storageClass: "gp3"  # AWS GP3 storage
  size: 100Gi
  accessMode: ReadWriteOnce

# templates/pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: {{ include "myapp.fullname" . }}-data
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: {{ .Values.persistence.size }}
  {{- if .Values.persistence.storageClass }}
  storageClassName: {{ .Values.persistence.storageClass }}
  {{- end }}

Multi-Cloud Storage Configuration¶

For applications that need to work across different cloud providers, you can use layered config logic in your Helm config values in Omnistrate.

Creating Custom Storage Classes¶

If the pre-provisioned storage classes don't meet your specific requirements, you can create your own storage classes using the pre-installed drivers that Omnistrate provides for each cloud provider.

Available Pre-Installed Drivers¶

Omnistrate pre-installs the following storage drivers in each deployment cell:

Block Storage Drivers¶

AWS: - ebs.csi.aws.com - AWS EBS CSI driver for block storage

GCP: - pd.csi.storage.gke.io - GCP Persistent Disk CSI driver for block storage

Azure: - disk.csi.azure.com - Azure Disk CSI driver for block storage

File Storage Drivers¶

AWS: - efs.csi.aws.com - AWS EFS CSI driver for shared file systems

GCP: - filestore.csi.storage.gke.io - GCP Filestore CSI driver for shared file systems

Azure: - file.csi.azure.com - Azure Files CSI driver for shared file systems

Blob Storage Drivers¶

AWS: - s3.csi.aws.com - AWS S3 CSI driver for object storage

GCP: - gcs.csi.storage.gke.io - GCP Cloud Storage CSI driver for object storage

Azure: - blob.csi.azure.com - Azure Blob Storage CSI driver for object storage

Custom Storage Class Examples¶

Custom Block Storage Class¶

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: custom-high-iops
provisioner: ebs.csi.aws.com
parameters:
  type: io2
  iops: "20000"
  throughput: "1000"
  encrypted: "true"
volumeBindingMode: WaitForFirstConsumer
reclaimPolicy: Delete
allowVolumeExpansion: true

Custom File Storage Class¶

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: custom-efs-performance
provisioner: efs.csi.aws.com
parameters:
  provisioningMode: efs-ap
  fileSystemId: fs-12345678
  directoryPerms: "0755"
  performanceMode: maxIO
  throughputMode: provisioned
  provisionedThroughputInMibps: "500"
volumeBindingMode: Immediate
reclaimPolicy: Delete

Custom Blob Storage Class¶

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: custom-s3-storage
provisioner: s3.csi.aws.com
parameters:
  mounter: geesefs
  bucketName: my-custom-bucket
  region: us-west-2
  storageClass: STANDARD_IA
volumeBindingMode: Immediate
reclaimPolicy: Delete

Monitoring and Troubleshooting¶

Check Storage Class Availability¶

# List available storage classes
kubectl get storageclass

# Describe a specific storage class
kubectl describe storageclass gp3

Monitor PVC Status¶

# Check PVC status
kubectl get pvc

# Describe PVC for troubleshooting
kubectl describe pvc my-app-data

Common Issues¶

1. PVC Stuck in Pending: Verify the storage class exists and there is sufficient quota in the deployment cell
2. Volume Mount Failures: Ensure the storage class supports the requested access mode
3. Performance Issues: Consider upgrading to a higher-performance storage class or adjusting IOPS settings