Terraform -Implement Application Load Balancer with Auto Scaling Group & EC2

Introduction

This repo implements the provisions the following infrastructure on the AWS:

• VPC.
• Security Group.
• Subnets.
• Route Table.
• Internet Gateway.
• Launch Configuration (with custom AMI).
• Application Load Balancer:
  • Load Balancer.
  • Target Group.
• Auto Scaling Group.
• Auto Scaling Policies.
  • Predictive Auto Scaling.
  • Horizontal Auto Scaling.

Pre Requisites

You must have the following programs installed & configured properly on your machine:

• Terraform.
• AWS CLI.

Installation

Clone the repo using the following:

# Using HTTPS

git clone https://github.com/srmklive/ec2-alb-asg.git

# Using SSH
git clone git@github.com:srmklive/ec2-alb-asg.git

Configuring the code

Important

You should also rename the infrastructure being provisioned as per your liking.

Caution

You must update the values mentioned below. The prefilled values referring to AMI & S3 buckets are really removed.

Set AMI for Launch configuration

To do this, open the terraform.tfvars file in the root folder, and change the value to the AMI ID you need to use.

Set S3 Bucket for Terraform State

Important

If you want to save Terraform state locally, just comment out the lines 10-14 in the providers.tf file.

If you intend to use S3 for saving your Terraform state, open the providers.tf file and change the lines 10-13 as per your own liking. Most probably you just need to update the bucket & region values.

Running the code

terraform init

terraform plan -out="tf.plan"

terraform apply "tf.plan"