k3s-gitops/terraform/aws-infrastructure/README.md

🏗️ AWS Multi-Tier Infrastructure - Terraform Project

📋 Overview

Production-ready Terraform project for complete AWS multi-tier infrastructure with HA, security, and scalability best practices.

🏛️ Architecture

Internet → ALB → Public Subnets (Multi-AZ)
              ↓
           NAT Gateways
              ↓
    Private Subnets (App Tier + Auto Scaling)
              ↓
    Database Subnets (RDS PostgreSQL Multi-AZ)

📦 Components

• VPC - Isolated network across 2 AZs
• ALB - Application Load Balancer
• Auto Scaling - EC2 with dynamic scaling
• RDS PostgreSQL - Managed database with backups
• S3 - Storage buckets (data/logs/backups)
• CloudWatch - Monitoring & alerting
• IAM - Security roles & policies

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🚀 Quick Start

# 1. Clone
git clone http://git.thedevops.dev/admin/k3s-gitops.git
cd k3s-gitops/terraform/aws-infrastructure

# 2. Configure AWS
export AWS_ACCESS_KEY_ID="your-key"
export AWS_SECRET_ACCESS_KEY="your-secret"

# 3. Create config
cp environments/dev.tfvars terraform.tfvars
vim terraform.tfvars  # Edit: project_name, db_password

# 4. Deploy
terraform init
terraform plan
terraform apply

Deploy time: ~15-20 minutes
Dev cost: ~$50-100/month

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📁 Project Structure

terraform/aws-infrastructure/
├── main.tf               # Main configuration
├── variables.tf          # Input variables
├── outputs.tf            # Output values
├── Jenkinsfile           # CI/CD pipeline
├── environments/         # Environment configs
│   ├── dev.tfvars
│   ├── staging.tfvars
│   └── production.tfvars
├── modules/              # Reusable modules
│   ├── vpc/
│   ├── alb/
│   ├── asg/
│   ├── rds/
│   └── ...
├── scripts/
│   └── user-data.sh      # EC2 bootstrap
└── docs/
    ├── QUICKSTART.md     # 5-min setup guide
    ├── ARCHITECTURE.md   # Detailed design
    └── SECURITY.md       # Best practices

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🎯 Usage Examples

Development Environment

terraform apply -var-file="environments/dev.tfvars"

Production Environment

terraform apply -var-file="environments/production.tfvars"

Scale Application

# Edit terraform.tfvars
asg_desired_capacity = 5

terraform apply

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🔧 Configuration

Minimum required variables:

# terraform.tfvars
project_name = "myapp"
environment  = "dev"
db_username  = "admin"
db_password  = "SecurePassword123!"

See environments/ for full examples

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📊 Outputs

# View all outputs
terraform output

# Get ALB DNS
terraform output alb_dns_name

# Get RDS endpoint  
terraform output rds_endpoint

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🔐 Security

• ✅ State encryption in S3
• ✅ Private subnets for apps
• ✅ Isolated database subnets
• ✅ Security groups with minimal permissions
• ✅ Secrets in AWS Secrets Manager
• ✅ VPC Flow Logs enabled
• ✅ CloudTrail auditing

⚠️ NEVER commit secrets to Git!

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🔄 CI/CD

Jenkins pipeline included with:

• ✅ Terraform validation
• ✅ Security scanning (tfsec)
• ✅ Cost estimation (Infracost)
• ✅ Approval gates for production
• ✅ Automated smoke tests

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📚 Documentation

• Quick Start Guide - 5-minute setup
• Architecture Details - Design deep-dive
• Security Best Practices - Hardening guide
• Troubleshooting - Common issues

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💰 Cost Estimates

Environment	Monthly Cost
Development	$50-100
Staging	$200-400
Production	$500-1000

Actual costs depend on usage and instance types

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🧪 Testing

# Validate
terraform validate

# Format check
terraform fmt -check -recursive

# Security scan
docker run --rm -v $(pwd):/src aquasec/tfsec /src

---

🗑️ Cleanup

# Destroy dev
terraform destroy -var-file="environments/dev.tfvars"

# ⚠️ Production requires manual approval

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📞 Support

• 🐛 Issues
• 💬 Slack: #infrastructure
• 📧 Email: devops@example.com

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📄 License

MIT License

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Status: ✅ Production Ready
Version: 1.0.0
Last Updated: 2026-01-06