# Day 68 - Scaling with Terraform Before proceeding, we have to set up AWS Provider, Region, VPC, InternetGateway, Security Group, and RouteTable. Prerequisite : If you have not setup terraform please follow below blog: %[https://hashnode.com/post/cljbzmnad000109mv11753vyu] 1. create `terraform.tf` ```bash terraform { required_providers { aws = { source = "hashicorp/aws" version = "~> 4.0" } } } ``` 1. create `vpc.tf` ```bash provider "aws" { region = "us-east-1" } resource "aws_vpc" "main" { cidr_block = "10.0.0.0/16" tags = { Name = "ajay-vpc" } } ``` 1. create `public_subnet.tf` ```bash resource "aws_subnet" "public_subnet" { vpc_id = aws_vpc.main.id cidr_block = "10.0.1.0/24" availability_zone = "us-east-1a" tags = { Name = "Public Subnet" } } resource "aws_subnet" "public_subnet_1b" { vpc_id = aws_vpc.main.id cidr_block = "10.0.3.0/24" availability_zone = "us-east-1b" tags = { Name = "public-subnet-2" } } ``` 1. create `internet_gateway.tf` ```bash resource "aws_internet_gateway" "igw" { vpc_id = aws_vpc.main.id tags = { Name = "My IGW" } } ``` 1. create `public_route_table.tf` ```bash resource "aws_route_table" "public_route_table" { vpc_id = aws_vpc.main.id route { cidr_block = "0.0.0.0/0" gateway_id = aws_internet_gateway.igw.id } tags = { Name = "Public Route Table" } } resource "aws_route_table_association" "public_subnet_association" { subnet_id = aws_subnet.public_subnet.id route_table_id = aws_route_table.public_route_table.id } resource "aws_route_table_association" "public_subnet_association_1b" { subnet_id = aws_subnet.public_subnet_1b.id route_table_id = aws_route_table.public_route_table.id } ``` 1. create `ec2_security_group.tf` ```bash resource "aws_security_group" "ec2_security_group" { name = "EC2 Security Group" description = "Allow SSH access" vpc_id = aws_vpc.main.id ingress { from_port = 22 to_port = 22 protocol = "tcp" cidr_blocks = ["0.0.0.0/0"] } ingress { from_port = 80 to_port = 80 protocol = "tcp" cidr_blocks = ["0.0.0.0/0"] } ingress { from_port = 443 to_port = 443 protocol = "tcp" cidr_blocks = ["0.0.0.0/0"] } egress { from_port = 0 to_port = 0 protocol = "-1" cidr_blocks = ["0.0.0.0/0"] } } ``` 1. create `as_group.tf` ```bash resource "aws_launch_configuration" "web_server_as" { image_id = "ami-053b0d53c279acc90" instance_type = "t2.micro" security_groups = [aws_security_group.ec2_security_group.id] user_data = <<-EOF #!/bin/bash sudo apt-get update -y sudo apt-get install apache2 -y sudo systemctl start apache2 sudo systemctl enable apache2 sudo systemctl restart apache2 sudo chmod 766 /var/www/html/index.html sudo echo "

Welcome to Terraform Scaling.

" >/var/www/html/index.html EOF } resource "aws_elb" "web_server_lb"{ name = "web-server-lb" security_groups = [aws_security_group.ec2_security_group.id] subnets = [aws_subnet.public_subnet.id,aws_subnet.public_subnet_1b.id] listener { instance_port = 80 instance_protocol = "http" lb_port = 80 lb_protocol = "http" } tags = { Name = "terraform-elb" } } resource "aws_autoscaling_group" "web_server_asg" { name = "web-server-asg" launch_configuration = aws_launch_configuration.web_server_as.name min_size = 1 max_size = 3 desired_capacity = 2 health_check_type = "EC2" load_balancers = [aws_elb.web_server_lb.name] vpc_zone_identifier = [aws_subnet.public_subnet.id, aws_subnet.public_subnet_1b.id] } ``` Now run `terraform init` then `terraform plan` ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1688101102648/9bb8021f-8edd-4c77-a54e-ab9266ae3e31.png align="center") then `terraform apply` ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1688101146500/b8bb6405-5ab5-45ef-88ad-b6d39af31cce.png align="center") Once Terraform is done with execution two new EC2 instances are created as desired capacity is set to 2. You will see 1 auto scaling group named web-server-asg and 1 load balancer named web-server-lb ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1688101281113/2b4db0a1-391e-4173-ab3e-0b8089bd39ec.png align="center") ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1688101325153/ed9108d9-29df-4a2b-ad61-4afb2d67db85.png align="center") Now if you check your load balancer DNS URL: ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1688103770741/a1b523b1-64c6-49da-8e36-06a2da03ed02.png align="center") That was all for today. If you have any queries/suggestions please write in comment. See you another day with another challenge.