Microservices with ALB - Terraform Infrastructure
Overview
This repository provides a Terraform-based infrastructure-as-code (IaC) solution to deploy a microservices architecture using AWS services. The architecture includes:
Application Load Balancer (ALB) with Path-Based Routing
EC2 Auto-Scaling Groups for scalable compute resources
AWS Lambda for serverless compute needs
Amazon Aurora and DynamoDB databases for storage
High availability and multi-AZ support
Secure VPC setup with public and private subnets
Multiple environments (Production, Development, QA, Staging)
Architecture Diagram
Components
VPC: Secure network with public and private subnets.
ALB: Manages traffic routing based on paths to different services.
Target Groups: Routes traffic to EC2 instances, Lambda, and Kubernetes.
Auto Scaling Groups: Ensures high availability and scalability for EC2.
Lambda: Serverless computing for microservices.
Aurora and DynamoDB: Databases for different services.
Security Groups: Provides firewall-level security.
Directory Structure
├── terraform/ │ ├── providers.tf # AWS provider configuration │ ├── vpc.tf # VPC and subnet definitions │ ├── security_groups.tf # Security group definitions │ ├── alb.tf # Application Load Balancer configuration │ ├── target_groups.tf # Target groups and rules for ALB │ ├── listeners.tf # Listener rules for ALB │ ├── autoscaling.tf # EC2 auto-scaling group setup │ ├── lambda.tf # AWS Lambda configuration │ ├── iam.tf # IAM roles and policies │ ├── databases.tf # Aurora and DynamoDB configuration │ ├── variables.tf # Input variables │ ├── outputs.tf # Outputs of the infrastructure │ ├── terraform.tfvars # Environment-specific variables │ ├── backend.tf # Remote backend configuration │ ├── versions.tf # Version constraints └── README.md
Prerequisites
Terraform: Install Terraform CLI from Terraform Download.
AWS CLI: Install AWS CLI and configure credentials.
IAM Role: Ensure you have permissions to create IAM roles, VPCs, EC2 instances, and RDS databases.
Terraform Backend: Setup S3 bucket and DynamoDB for remote state management.
Environments
The infrastructure is designed to support multiple environments:
Production
Development
QA
Staging
Use terraform.tfvars to define variables specific to each environment.
Deployment Steps
Clone Repository
git clone https://github.com/yourusername/repository-name.git cd repository-name/terraform
Initialize Terraform
terraform init
Plan Changes
terraform plan -var-file="terraform.tfvars"
Apply Changes
terraform apply -var-file="terraform.tfvars"
Destroy Infrastructure (if required)
terraform destroy -var-file="terraform.tfvars"
Outputs
After successful deployment, the ALB DNS name will be provided as output:
Outputs: alb_dns_name = "example-alb-12345678.us-east-1.elb.amazonaws.com"
Security Measures
Security groups enforce least privilege principles.
Database credentials are managed securely using environment variables.
Data in transit is secured using HTTPS.
Multi-AZ deployments ensure high availability and disaster recovery.
Access control policies implemented for IAM roles.
Monitoring & Logging
AWS CloudWatch is used for monitoring logs and performance metrics.
Alarms can be configured to notify admins of any failures.