How do I set a default StorageClass in Kubernetes?

In this guide, we will set a default StorageClass in Kubernetes using Pulumi. A StorageClass provides a way for administrators to describe the “classes” of storage they offer. Different classes might map to quality-of-service levels, or to backup policies, or to arbitrary policies determined by the cluster administrators. Kubernetes uses a default StorageClass to dynamically provision persistent volumes when none is specified.

We will create a StorageClass and mark it as the default by adding the appropriate annotation.

import * as pulumi from "@pulumi/pulumi";
import * as k8s from "@pulumi/kubernetes";

// Create a StorageClass
const storageClass = new k8s.storage.v1.StorageClass("default-storage-class", {
    metadata: {
        name: "default-storage-class",
        annotations: {
            "storageclass.kubernetes.io/is-default-class": "true", // Mark this StorageClass as default
        },
    },
    provisioner: "kubernetes.io/aws-ebs", // Provisioner for AWS EBS
    parameters: {
        type: "gp2", // General Purpose SSD
    },
    reclaimPolicy: "Retain",
    volumeBindingMode: "Immediate",
});

export const storageClassName = storageClass.metadata.name;

Key Points

• We imported the necessary Pulumi and Kubernetes packages.
• We created a StorageClass resource with the kubernetes.io/aws-ebs provisioner.
• We set the storageclass.kubernetes.io/is-default-class annotation to true to make this StorageClass the default.
• We configured the parameters for the StorageClass, such as the type of EBS volume (gp2), reclaim policy (Retain), and volume binding mode (Immediate).

Conclusion

We successfully created and set a default StorageClass in Kubernetes using Pulumi. This StorageClass will be used by default when persistent volumes are dynamically provisioned and no other StorageClass is specified.