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Three Tier Architecture

AWS Three Tier Architecture Reference

This is an implementation of the classic three tier architecture for application hosting.
Three modules that constructs our architecture:

How to deploy

Setup:

Run commands to deploy:

  • export env=dev (or prod)
  • terraform get -update=true
  • terraform init -backend-config=config/backend-${env}.conf -backend=true
  • terraform apply -var-file=config/${env}.tfvars -var password=<db password> -lock=true

Learn more about Terraform commands here

Configuration files

There are two example configuration files in the config/ folder. Each contains inputs for the main terraform module to run.

  • dev: for development environment settings
  • prod: for production like environment settings

Main terraform module inputs

Name Description Type Default Required
allocated_storage The amount of allocated storage string - yes
db_subnet_b_cidr The cidr range for db subnet b string - yes
db_subnet_c_cidr The cidr range for db subnet c string - yes
instance_class RDS instance class (e.g. db.t2.micro or db.m4.xlarge) string - yes
multi_az Create a replica in different zone if set to true string - yes
password RDS password string - yes
private_subnet_b_cidr The cidr range for private subnet b string - yes
private_subnet_c_cidr The cidr range for private subnet c string - yes
public_subnet_b_cidr The cidr range for public subnet b string - yes
public_subnet_c_cidr The cidr range for public subnet c string - yes
skip_final_snapshot Creates a snapshot when db is deleted if set to true string - yes
username RDS username string - yes
vpc_cidr The cidr range for vpc string - yes

Outputs

Name Description
elb_dns Elastic Load Balancer DNS
rds_endpoint RDS endpoint

References

CI/CD support