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aws_resources.tf
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aws_resources.tf
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# VPC
resource "aws_vpc" "main" {
cidr_block = "10.0.0.0/16"
enable_dns_hostnames = true
enable_dns_support = true
tags = {
Name = "K3s VPC"
}
}
# Public Subnet
resource "aws_subnet" "public" {
vpc_id = aws_vpc.main.id
cidr_block = "10.0.1.0/24"
availability_zone = "${var.aws_region}a"
map_public_ip_on_launch = true
tags = {
Name = "Public Subnet"
}
}
# Private Subnet
resource "aws_subnet" "private" {
vpc_id = aws_vpc.main.id
cidr_block = "10.0.2.0/24"
availability_zone = "${var.aws_region}b"
tags = {
Name = "Private Subnet"
}
}
# Internet Gateway
resource "aws_internet_gateway" "gw" {
vpc_id = aws_vpc.main.id
tags = {
Name = "K3s Internet Gateway"
}
}
# Elastic IP for NAT Gateway
resource "aws_eip" "nat" {
domain = "vpc"
tags = {
Name = "NAT Gateway EIP"
}
}
# NAT Gateway
resource "aws_nat_gateway" "main" {
allocation_id = aws_eip.nat.id
subnet_id = aws_subnet.public.id
tags = {
Name = "K3s NAT Gateway"
}
depends_on = [aws_internet_gateway.gw]
}
# Route Table (Public)
resource "aws_route_table" "public" {
vpc_id = aws_vpc.main.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.gw.id
}
tags = {
Name = "Public Route Table"
}
}
# Route Table (Private)
resource "aws_route_table" "private" {
vpc_id = aws_vpc.main.id
route {
cidr_block = "0.0.0.0/0"
nat_gateway_id = aws_nat_gateway.main.id
}
tags = {
Name = "Private Route Table"
}
}
# Route Table Association (Public)
resource "aws_route_table_association" "public" {
subnet_id = aws_subnet.public.id
route_table_id = aws_route_table.public.id
}
# Route Table Association (Private)
resource "aws_route_table_association" "private" {
subnet_id = aws_subnet.private.id
route_table_id = aws_route_table.private.id
}
# Security Group (NGINX)
resource "aws_security_group" "nginx" {
name = "NGINX Security Group"
description = "Allow inbound HTTP/HTTPS traffic"
vpc_id = aws_vpc.main.id
ingress {
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
ingress {
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["10.0.0.0/16"]
}
ingress {
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
ingress {
from_port = 22
to_port = 22
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 = "NGINX Security Group"
}
}
# Security Group (K3s Cluster)
resource "aws_security_group" "k3s" {
name = "K3s Security Group"
description = "Allow inbound traffic for K3s cluster"
vpc_id = aws_vpc.main.id
ingress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["10.0.0.0/16"]
}
ingress {
from_port = 22
to_port = 22
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 = "K3s Security Group"
}
}
#Key Pair
resource "aws_key_pair" "k3s_key" {
key_name = "k3s-key"
public_key = tls_private_key.k3s_connect_aws.public_key_openssh
}
# NGINX Load Balancer Instance
resource "aws_instance" "nginx" {
ami = data.aws_ami.ubuntu_24_04.id
instance_type = "t3.micro"
subnet_id = aws_subnet.public.id
key_name = aws_key_pair.k3s_key.id
associate_public_ip_address = true
vpc_security_group_ids = [aws_security_group.nginx.id]
user_data = <<-EOF
#!/bin/bash
apt-get update
apt-get install -y nginx
# Create a simple HTML page
cat > /var/www/html/index.html <<'EOL'
<!DOCTYPE html>
<html>
<head>
<title>Welcome to K3s Cluster Orchestration</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 40px auto;
max-width: 650px;
line-height: 1.6;
padding: 0 10px;
}
</style>
</head>
<body>
<h1>Welcome to K3s Cluster Orchestration</h1>
<h1>AWS Infrastructure Automation with Terraform Blueprint</h1>
</body>
</html>
EOL
# Configure NGINX
cat > /etc/nginx/sites-available/default <<'EOL'
server {
listen 80 default_server;
listen [::]:80 default_server;
root /var/www/html;
index index.html index.htm;
server_name _;
location / {
try_files $uri $uri/ =404;
}
}
EOL
systemctl restart nginx
EOF
tags = {
Name = "NGINX Load Balancer"
}
depends_on = [aws_internet_gateway.gw, local_file.tls_private_key]
}
# K3s Master Node
resource "aws_instance" "k3s_master" {
ami = data.aws_ami.ubuntu_24_04.id
instance_type = "t3.micro"
subnet_id = aws_subnet.private.id
key_name = aws_key_pair.k3s_key.id
vpc_security_group_ids = [aws_security_group.k3s.id]
user_data = <<-EOF
#!/bin/bash
apt-get update
apt-get install -y curl
curl -sfL https://get.k3s.io | sh -
EOF
tags = {
Name = "K3s Master Node"
}
depends_on = [aws_nat_gateway.main]
}
# K3s Worker Nodes
resource "aws_instance" "k3s_workers" {
count = var.count_of_workers
ami = data.aws_ami.ubuntu_24_04.id
instance_type = "t3.micro"
subnet_id = aws_subnet.private.id
key_name = aws_key_pair.k3s_key.id
vpc_security_group_ids = [aws_security_group.k3s.id]
user_data = <<-EOF
#!/bin/bash
apt-get update
apt-get install -y curl
#MASTER_IP=${aws_instance.k3s_master.private_ip}
#TOKEN=$(ssh -o StrictHostKeyChecking=no ubuntu@${aws_instance.k3s_master.private_ip} -t "sudo cat /var/lib/rancher/k3s/server/node-token")
#curl -sfL https://get.k3s.io | K3S_URL=https://$MASTER_IP:6443 K3S_TOKEN=$TOKEN sh -
EOF
tags = {
Name = "K3s Worker Node ${count.index + 1}"
}
depends_on = [aws_nat_gateway.main, aws_instance.k3s_master]
}
resource "tls_private_key" "k3s_connect_aws" {
algorithm = "RSA"
rsa_bits= 2048
}
resource "local_file" "tls_private_key" {
content = tls_private_key.k3s_connect_aws.private_key_pem
filename = "./private_key.pem"
depends_on = [tls_private_key.k3s_connect_aws]
}
resource "null_resource" "run_commands"{
connection{
type = "ssh"
user = "ubuntu"
private_key = tls_private_key.k3s_connect_aws.private_key_pem
host = aws_instance.nginx.public_ip
}
provisioner "file"{
content = <<EOF
"${tls_private_key.k3s_connect_aws.private_key_pem}"
EOF
destination = "/tmp/private_key.pem"
}
provisioner "remote-exec" {
inline = [
"mkdir ~/.ssh",
"cp /tmp/private_key.pem ~/.ssh/",
"rm /tmp/private_key.pem",
"sudo chown ubuntu:ubuntu ~/.ssh/private_key.pem",
"sudo chmod 600 ~/.ssh/private_key.pem"
]
}
}