This code is to generate an EC2 instance with a VPC having a specific cidr range preset ami of a server hosting apache/static website and , security groups opening to port 22(SSH) and port 80(HHTP), generates a key-pair and spit out 3 outputs (ec2 public ip, dns name and vpc id);

provider block

provider "aws" { region = "us-east-1" }

Create vpc

module "vpc" { source = "terraform-aws-modules/vpc/aws"

name = "utc-app1" cidr = "192.168.0.0/16"

azs = ["us-east-1a", "us-east-1b"] private_subnets = ["192.168.1.0/24", "192.168.2.0/24"] public_subnets = ["192.168.101.0/24", "192.168.102.0/24"]

enable_nat_gateway = false enable_vpn_gateway = false enable_dns_hostnames = true

tags = { Name: "utc-app1" env: "dev" team: "wdp" created-by: "Gaetan P." } }

Security group

resource "aws_security_group" "sg" { name = "webserver-sg" description = "allow traffic on 22 and 80" vpc_id = module.vpc.vpc_id

ingress { description = "22 for ssh" from_port = 22 to_port = 22 protocol = "tcp" cidr_blocks = ["0.0.0.0/0"]

} ingress { description = "80 for http" from_port = 80 to_port = 80 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"]

}

tags = { Name = "webserver-sg" Env = "dev" Created by = "Gaetan P." } }

Generate a secure key using a rsa algorithm

resource "tls_private_key" "ec2_key" { algorithm = "RSA" rsa_bits = 2048 }

creating the keypair in aws

resource "aws_key_pair" "ec2_key" { key_name = "terraform-key1"
public_key = tls_private_key.ec2_key.public_key_openssh }

Save the .pem file locally for remote connection

resource "local_file" "ssh_key" { filename = "terraform.pem" content = tls_private_key.ec2_key.private_key_pem }

create the ec2 instance

resource "aws_instance" "server" { ami = "ami-0393ee318b08f4511" instance_type = "t2.micro" key_name = aws_key_pair.ec2_key.key_name vpc_security_group_ids = [aws_security_group.sg.id] subnet_id = module.vpc.public_subnets[0] associate_public_ip_address = true

tags = { Name = "Terraform-ec2-instance" Env = "dev" Created by = "Gaetan P." } }

output "ec2_ip" { value = aws_instance.server.public_ip }

output "dns_name" { value = aws_instance.server.public_dns }

output "vpcid" { value = module.vpc.vpc_id }