Build a 3-Tier Multi-Region High Availability Infrastructure with AWS and Terraform

Project Design

Usage - Sample tfvars

# Default region
region = "us-east-1"

######################## VPC ######################################
cidr_block = "10.0.0.0/16"
egress = [{
  from_port   = 0
  to_port     = 0
  protocol    = "-1"
  cidr_blocks = ["0.0.0.0/0"]
}]

ingress = [{
  from_port = 80
  to_port   = 80
  protocol  = "tcp"
}]
enable_dns_hostnames = true
enable_dns_support   = true
create_db_subnet     = true


################################# ELB ##################################
name     = "Dev-Elb"
internal = false
listener = [{
  lb_port     = 80
  lb_protocol = "HTTP"
}]

target_grp = [{
  instance_port     = 80
  instance_protocol = "HTTP"
}]
enable_deletion_protection = false
load_balancer_type         = "application"


######################### Auto Scaling Group ##########################
min_size          = 1
max_size          = 3
desired_capacity  = 2
health_check_type = "ELB"
instance_type     = "t2.micro"



################################# RDS ##################################	
allocated_storage           = 20
storage_type                = "gp2"
engine                      = "mysql"
engine_version              = "5.7"
instance_class              = "db.t3.medium"
db_identifier               = "webapp-db"
db_username                 = "dbuser"
db_password                 = "dbpassword"
backup_region               = "us-east-2"
multi_az                    = true
skip_final_snapshot         = true
skip_final_snapshot_replica = true

Deploy

1. Navigate to the backend-launch directory and run the following commands to initialize and deploy the backend resources (S3 and DynamoDB):

   terraform init
   terraform apply

2. Navigate to the envs/dev directory and execute the following commands:

   terraform init
   terraform plan -var-file={name}.tfvars
   terraform apply -var-file={name}.tfvars

Destroy

1. In the same envs/dev directory, run the following command to tear down resources.

   terraform destroy -var-file={name}.tfvars