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Creating a cluster of web servers with an Elastic Load Balancer on AWS with Terraform

Update 📢

📺 Code has been updated to the latest syntax (July 3, 2020)

This is a Sample code to create a bunch of webservers behind a Load Balancer (ELB) with an Auto scaling group (ASG)

Deploy a Cluster of Web Servers

We will use ASG to launch a cluster of EC2 Instances, monitoring the health of each Instance, replacing failed Instances, and adjusting the size of the cluster in response to load.

  • ASG distributes the EC2 instances across multiple availability zones

Deploy a Load Balancer

After deploying the ASG you'll have several different servers, each with its own IP address, but you need to give your end users only a single IP to hit, and for this we're going to deploy a load balancer to distribute traffic across your servers and to give your end users a single DNS name which is the the load balancer DNS name

Install Terraform On Linux

For other platforms to install Terraform download the binary from the download page

https://www.terraform.io/downloads.html

yum -y install unzip

cd /tmp
wget https://releases.hashicorp.com/terraform/0.12.28/terraform_0.12.28_linux_amd64.zip
unzip terraform_0.12.28_linux_amd64.zip -d /usr/bin/

terraform -v

Usage

Insert your AWS access key & secret key as Environment Variables, In this way we're NOT setting them permanently, you'll need to run these commands again whenever you reopen your terminal

export AWS_ACCESS_KEY_ID=<your access key>
export AWS_SECRET_ACCESS_KEY=<your secret key>
yum -y install git
git clone https://github.com/Eslam-Naser/terraform-AWS-ASG-ELB.git
cd terraform-AWS-ASG-ELB/

# Downloading the Plugin for the AWS provider
terraform init
  • See what's Terraform is planning to do before really doing it
terraform plan
  • build the Terraform project
terraform apply
# yes | if you want to proceed
  • destroy what you've built
terraform destroy
# yes | if you want to proceed