How do I set up Infinispan Clusters for high availability in Kubernetes?

In this guide, we will set up an Infinispan cluster for high availability in a Kubernetes environment using Pulumi. Infinispan is a distributed in-memory key/value data store and grid computing platform. High availability ensures that the cluster remains operational even if some nodes fail.

We will create the following Kubernetes resources:

Namespace: To isolate the Infinispan resources.
Service Account: For Infinispan pods.
ConfigMap: To provide configuration to the Infinispan cluster.
StatefulSet: To manage the Infinispan pods.
Service: To expose the Infinispan cluster.

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

// Create a namespace for Infinispan
const namespace = new k8s.core.v1.Namespace("infinispan-ns", {
    metadata: { name: "infinispan" },
});

// Create a service account for Infinispan
const serviceAccount = new k8s.core.v1.ServiceAccount("infinispan-sa", {
    metadata: { namespace: namespace.metadata.name },
});

// Create a ConfigMap for Infinispan configuration
const configMap = new k8s.core.v1.ConfigMap("infinispan-config", {
    metadata: { namespace: namespace.metadata.name },
    data: {
        "infinispan.xml": `
<infinispan>
    <cache-container name="default">
        <transport stack="tcp"/>
    </cache-container>
</infinispan>
        `,
    },
});

// Create a StatefulSet for Infinispan
const statefulSet = new k8s.apps.v1.StatefulSet("infinispan", {
    metadata: { namespace: namespace.metadata.name },
    spec: {
        serviceName: "infinispan",
        replicas: 3,
        selector: { matchLabels: { app: "infinispan" } },
        template: {
            metadata: { labels: { app: "infinispan" } },
            spec: {
                serviceAccountName: serviceAccount.metadata.name,
                containers: [
                    {
                        name: "infinispan",
                        image: "infinispan/server:latest",
                        ports: [{ containerPort: 11222 }],
                        volumeMounts: [
                            {
                                name: "config-volume",
                                mountPath: "/opt/infinispan/server/conf",
                                subPath: "infinispan.xml",
                            },
                        ],
                    },
                ],
            },
        },
        volumeClaimTemplates: [
            {
                metadata: { name: "data" },
                spec: {
                    accessModes: ["ReadWriteOnce"],
                    resources: { requests: { storage: "1Gi" } },
                },
            },
        ],
    },
});

// Create a Service to expose the Infinispan cluster
const service = new k8s.core.v1.Service("infinispan-service", {
    metadata: { namespace: namespace.metadata.name },
    spec: {
        clusterIP: "None",
        ports: [{ port: 11222, targetPort: 11222 }],
        selector: { app: "infinispan" },
    },
});

Key Points

Namespace: Created to isolate Infinispan resources.
Service Account: Used by Infinispan pods for Kubernetes API access.
ConfigMap: Provides Infinispan configuration.
StatefulSet: Manages Infinispan pods with persistent storage.
Service: Exposes the Infinispan cluster within the Kubernetes cluster.

Summary

We set up an Infinispan cluster for high availability in Kubernetes using Pulumi. We created a namespace, service account, config map, stateful set, and service to ensure the cluster is resilient and highly available. This configuration ensures that the Infinispan cluster can handle node failures and continue to operate efficiently.

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