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Configuring a Personal Utility Load Balancer for Your Personal EKS Cluster utilizing Terraform


Amazon Net Companies (AWS) gives a robust mixture of companies for constructing, deploying, and managing functions. Amazon Elastic Kubernetes Service (EKS) is a managed Kubernetes service that simplifies the method of deploying, managing, and scaling containerized functions utilizing Kubernetes. In sure eventualities, you may wish to deploy a personal Utility Load Balancer (ALB) in entrance of your non-public EKS cluster to deal with incoming site visitors effectively. On this information, we’ll stroll by means of the method of organising a personal ALB to your non-public EKS cluster utilizing Terraform, together with greatest practices and complicated particulars.


Earlier than you start, guarantee you’ve got the next conditions:

  • AWS Account: Entry to an AWS account with crucial permissions to create assets.
  • Terraform: Put in Terraform CLI in your native machine.
  • AWS CLI: Put in AWS Command Line Interface to configure your AWS credentials.

Step-by-Step Information

1. Configure AWS Credentials

Open your terminal and run the next command to configure your AWS credentials:

aws configure

Enter your AWS Entry Key ID, Secret Entry Key, default area, and most popular output format.

2. Create a VPC

With a view to arrange a personal ALB and EKS cluster, you want a Digital Personal Cloud (VPC) with non-public subnets. Create a brand new Terraform configuration file (e.g., and outline your VPC, non-public subnets, and crucial networking parts.

useful resource "aws_vpc" "my_vpc" {
  cidr_block = ""

useful resource "aws_subnet" "private_subnets" {
  depend = 2
  cidr_block = "10.0.${depend.index}.0/24"
  vpc_id =

  tags = {
    Title = "private-subnet-${depend.index}"

3. Create an EKS Cluster

Outline your EKS cluster configuration in a brand new Terraform configuration file (e.g., Specify your required Kubernetes model, cluster title, and VPC configuration.

module "eks_cluster" {
  supply          = "terraform-aws-modules/eks/aws"
  cluster_name    = "my-eks-cluster"
  subnets         = aws_subnet.private_subnets[*].id
  vpc_id          =
  cluster_version = "1.21"
  tags = {
    Terraform = "true"

4. Create a Safety Group for EKS Nodes

You could create a safety group to regulate inbound and outbound site visitors to your EKS nodes. Add the next to your file:

useful resource "aws_security_group" "eks_nodes" {
  name_prefix = "eks-nodes-"
  vpc_id      =
  // Outline your safety group guidelines right here

5. Create an ALB Safety Group

Equally, create a safety group for the non-public ALB. Add the next to your file:

useful resource "aws_security_group" "alb_sg" {
  name_prefix = "alb-sg-"
  vpc_id      =
  // Outline your ALB safety group guidelines right here

6. Create the Personal ALB

Create a brand new Terraform configuration file (e.g., to outline the non-public ALB. Specify your listener configurations, safety teams, and goal group.

useful resource "aws_lb" "private_alb" {
  title               = "private-alb"
  inner           = true
  load_balancer_type = "utility"
  subnets            = aws_subnet.private_subnets[*].id

  enable_deletion_protection = false

useful resource "aws_lb_listener" "alb_listener" {
  load_balancer_arn = aws_lb.private_alb.arn
  port              = 80
  protocol          = "HTTP"

  default_action {
    target_group_arn = aws_lb_target_group.alb_target_group.arn
    sort             = "fixed-response"

    fixed_response {
      content_type = "textual content/plain"
      message_body = "Hey, that is the ALB!"
      status_code  = "200"

useful resource "aws_lb_target_group" "alb_target_group" {
  title        = "alb-target-group"
  port        = 80
  protocol    = "HTTP"
  vpc_id      =
  target_type = "ip"

7. Replace EKS Node Safety Group

Replace the EKS node safety group to permit site visitors from the ALB safety group. Modify your file:

useful resource "aws_security_group_rule" "alb_ingress" {
  sort        = "ingress"
  from_port   = 80
  to_port     = 80
  protocol    = "tcp"
  cidr_blocks = []
  security_group_id =

8. Deploy the Configuration

In your terminal, navigate to the listing containing your Terraform recordsdata and run the next instructions:

terraform init
terraform apply

Terraform will provision the assets outlined in your configuration recordsdata.

In Closing

Establishing a personal ALB in entrance of a personal EKS cluster utilizing Terraform requires cautious planning and configuration. By following the steps outlined on this information, you possibly can effectively deploy and handle your infrastructure, adhering to greatest practices. This method allows you to securely deal with incoming site visitors and make sure the clean operation of your non-public EKS cluster.

Do not forget that this information gives a primary setup for demonstration functions. In real-world eventualities, it is best to customise the configurations to match your utility’s necessities and contemplate safety, scalability, and excessive availability elements.




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