How do I configure a Kubernetes AWS TargetGroupBinding with Pulumi?

In this guide, we will configure an AWS TargetGroupBinding in a Kubernetes cluster using Pulumi. The TargetGroupBinding resource allows you to bind Kubernetes services to AWS Elastic Load Balancer (ELB) target groups, enabling load balancing for your Kubernetes workloads.

Key Points:

AWS Load Balancer Controller: Ensure that the AWS Load Balancer Controller is installed in your Kubernetes cluster.
Target Group: Create an AWS target group.
TargetGroupBinding: Define a TargetGroupBinding resource in Kubernetes to bind a service to the target group.

Steps:

Install AWS Load Balancer Controller: Ensure that the AWS Load Balancer Controller is installed in your Kubernetes cluster. This controller manages the lifecycle of AWS ELB resources.
Create an AWS Target Group: Use Pulumi to create an AWS target group.
Define TargetGroupBinding: Create a TargetGroupBinding resource in Kubernetes to bind a service to the target group.

Below is the complete Pulumi program to achieve this:

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

// Create an AWS VPC
const vpc = new aws.ec2.Vpc("vpc", {
    cidrBlock: "10.0.0.0/16",
    enableDnsSupport: true,
    enableDnsHostnames: true,
});

// Create subnets
const subnet = new aws.ec2.Subnet("subnet", {
    vpcId: vpc.id,
    cidrBlock: "10.0.1.0/24",
    availabilityZone: "us-west-2a",
});

// Create a Security Group
const securityGroup = new aws.ec2.SecurityGroup("securityGroup", {
    vpcId: vpc.id,
    ingress: [
        { protocol: "tcp", fromPort: 80, toPort: 80, cidrBlocks: ["0.0.0.0/0"] },
    ],
    egress: [
        { protocol: "tcp", fromPort: 0, toPort: 0, cidrBlocks: ["0.0.0.0/0"] },
    ],
});

// Create an AWS Target Group
const targetGroup = new aws.lb.TargetGroup("targetGroup", {
    port: 80,
    protocol: "HTTP",
    vpcId: vpc.id,
    targetType: "ip",
    healthCheck: {
        path: "/",
        interval: 30,
    },
});

// Define a Kubernetes Namespace
const namespace = new k8s.core.v1.Namespace("appNamespace", {
    metadata: { name: "app" },
});

// Define a Kubernetes Deployment
const appLabels = { app: "my-app" };
const deployment = new k8s.apps.v1.Deployment("appDeployment", {
    metadata: { namespace: namespace.metadata.name },
    spec: {
        replicas: 2,
        selector: { matchLabels: appLabels },
        template: {
            metadata: { labels: appLabels },
            spec: {
                containers: [{
                    name: "nginx",
                    image: "nginx",
                    ports: [{ containerPort: 80 }],
                }],
            },
        },
    },
});

// Define a Kubernetes Service
const service = new k8s.core.v1.Service("appService", {
    metadata: { namespace: namespace.metadata.name },
    spec: {
        type: "NodePort",
        selector: appLabels,
        ports: [{ port: 80, targetPort: 80 }],
    },
});

// Define a TargetGroupBinding
const targetGroupBinding = new k8s.apiextensions.CustomResource("targetGroupBinding", {
    apiVersion: "elbv2.k8s.aws/v1beta1",
    kind: "TargetGroupBinding",
    metadata: {
        namespace: namespace.metadata.name,
        name: "app-tgb",
    },
    spec: {
        serviceRef: {
            name: service.metadata.name,
            port: 80,
        },
        targetGroupARN: targetGroup.arn,
    },
});

Summary:

In this guide, we configured an AWS TargetGroupBinding in a Kubernetes cluster using Pulumi. We created a VPC, subnets, a security group, and a target group on AWS. Then, we defined a Kubernetes namespace, deployment, and service. Finally, we created a TargetGroupBinding resource to bind the Kubernetes service to the AWS target group. This setup enables load balancing for the Kubernetes service using AWS ELB.

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