NodeJs

Architecture Diagram

Terraform script for 2 Tier Architecture

These scripts create:

• Standard Public and Private Subnets across 3 Azs for maximum high availability
• Public Subnet as standard is routed to internet gateway and attached to a NAT Gateway
• Application are built as Docker image and pushed to ECR
• Application runs on ECS Fargate to reduce the effort to run underlying infrastructure
• Application are configured with autoscaling policy based on CPU and Memory
• Application is Load Balanced with an ALB and perform Layer 7 Http Check. On the ECS task definition, it can define Layer 4 TCP Check.
• Database runs on RDS MySQL multi-AZ setup for high availability. Running on RDS reduce the effort to run the underlying infrastructure. Its running in the private subnet to block internet traffic
• Separate Lambda function to create the default schema for the database as database is accessible in the private subnet

Disclaimer

This setup is not fully readily PROD setup due to following points

• Security Groups are open to the whole vpc, which ideally should be open to ports that required. It was done intentionally for simplicity of development and testing
• DB in this setup is running t2.small which is not production grade
• DB can be further enhanced to use read replicas
• ECR can be replaced with EKS. ECS was chosen as it was taken from TF template developed earlier by me for simplicity of development

How to run this on your own?

1. Initialize and Create multiple workspace

terraform init 
terraform workspace new dev
terraform workspace new uat
terraform workspace new prod
terraform workspace select dev

2. Create variable terraform file terraform.tfvars

AWS_REGION="ap-southeast-1"
AWS_SECRET_KEY="SECRET_KEY"
AWS_ACCESS_KEY="ACCESS_KEY"

3. Apply terraform script

terraform plan
terraform apply

4. Create DB Schema via Lambda function

chmod +x deploy_lambda.sh
./deploy_lambda.sh