🏗️ IaC Templates

A monorepo of AWS infrastructure templates using CloudFormation and Terraform, organised as progressive practical exercises. They cover from basic networking to high availability architectures with load balancing, databases and storage.

---

📁 Repository structure

iac-templates/
├── cloudformation/
│   ├── tasks/                        # Exercise templates (progressive)
│   │   ├── template01.yml            # VPC + public subnet + conditional EC2
│   │   ├── template02.yml            # Multi-region VPC with Mappings + conditional IGW
│   │   ├── template03.yml            # ALB + Multi-AZ Auto Scaling Group
│   │   ├── template04.yml            # HA VPC with NAT Gateway + VPC Peering
│   │   ├── template05.yml            # Multi-AZ RDS MySQL in private subnets
│   │   └── template06.yml            # S3 Bucket with access policies and lifecycle
│   └── others/                       # Test templates
│       ├── hola.yml                  # Basic VPC + subnet + EC2 (first template)
│       ├── mappings.yml              # Mappings usage example
│       ├── rds.yml                   # Basic standalone RDS
│       └── rules1.yml                # Rules and validations example
├── terraform/
│   ├── 01-test/                      # Infrastructure testing
│   ├── 02-ubuntu24/                  # VPC + Ubuntu 24.04 EC2 instance
│   ├── 03-windows/                   # VPC + Windows Server 2022 EC2 instance
│   ├── 04-s3/                        # S3 Bucket with private access block
│   ├── 05-alb/                       # ALB + Target Group + Multi-AZ EC2
│   ├── 06-asg/                       # Auto Scaling Group + Launch Template
│   └── 07-rds/                       # Private RDS MySQL + DB Subnet Group + EC2 Bastion
└── README.md

---

☁️ CloudFormation

🚀 Deploy

# Validate before creating
aws cloudformation validate-template --template-body file://cloudformation/tasks/template01.yml

# Create stack
aws cloudformation create-stack \
  --stack-name my-stack \
  --template-body file://cloudformation/tasks/template01.yml \
  --parameters ParameterKey=CreateInstance,ParameterValue=true

# View outputs
aws cloudformation describe-stacks \
  --stack-name my-stack \
  --query 'Stacks[0].Outputs'

# Delete stack
aws cloudformation delete-stack --stack-name my-stack

🛠️ Concepts covered

CFN Concept	Templates
Parameters + AllowedValues	All
Conditions + !Equals / !If	01, 02, 03, 05, 06
Rules + Assertions	01
Mappings + !FindInMap	02, 04, 05, 06
!GetAZs + !Select	01, 02, 03, 04
VPC Peering	04
NAT Gateway	04
ALB + ASG + Launch Template	03
RDS Multi-AZ + Parameter Group	05
S3 lifecycle + bucket policies	06
Outputs with Export	04, 05, 06

---

🏗️ Terraform

🚀 Deploy

# Initialise Terraform (download providers)
terraform init

# Preview changes before applying
terraform plan

# Apply infrastructure
terraform apply

# Destroy infrastructure
terraform destroy

🛠️ Concepts covered

Terraform Concept	Templates
provider (AWS region)	All
module (modular infrastructure)	All
aws_vpc, aws_subnet, aws_internet_gateway	All
aws_route_table + aws_route_table_association	All
data "aws_ami"	02, 03, 05, 06
aws_security_group	01, 05, 07
aws_instance (EC2 + tags)	01, 02, 03, 05, 07
aws_s3_bucket + public access block	04
aws_lb + aws_lb_target_group + aws_lb_listener	05
aws_launch_template + aws_autoscaling_group	06
aws_db_instance (RDS) + aws_db_subnet_group	07

---

Templates designed for learning environments. AMIs, key names and some configurations are region-specific — review values before deploying to production.