Three Tier Application

This Terraform project was created to deploy an infrastructure of three-tier components. The infrastructure is secured by a Bastion host that is used for the SSH connection and connects with the other 2 tiers of the application, and we use an autoscaling group to maintain the scalability and redundancy of the components, on the other hand, we use a load balancer to guarantee the connection of the frontend through the internet.

Architecture

Prerequisites

• AWS Account
• Proper Permissions for your user
• Terraform installed on your IDE
• AWS CLI installed and configured on your IDE
• SSH Agent (For Windows PowerShell)

AWS configuration settings CLI

Run command:

aws configure
AWS Access Key ID [None]: access key
AWS Secret Access Key [None]: secret access key
Default region name [None]: region
Default output format [None]: default output format

Command to create the keypair for access to the bastion host

aws ec2 create-key-pair --key-name Three-Tier-Deployment --query 'KeyMaterial' --output text > Three-Tier-Deployment.pem

How to execute terraform code

1. Create a folder for the repository
2. Navigate to the project directory
3. Clone the repository:

git clone https://github.com/alejog38/AWSThreeTierApp.git

4. Initialize terraform

terraform init

5. Edit the terraform.tfvars file with your desired values, on the other hand, if you want to personalize the deployment you can check the variables.tf file.
6. Verification of the configuration

terraform plan -var-file=terraform.tfvars

7. Deploy

terraform apply -var-file=terraform.tfvars

8. Destroy

terraform destroy -var-file=terraform.tfvars

How to connect to the Bastion Host

Command to connect to the Bastion host, we need to use the keypair file

ssh -i <Keypair_Path> ec2-user@<Public_IP_Address>

If you want to connect to the other EC2 instances when you entering to the Bastion host you can use:

ssh -A ec2-user@<Private_IP_Address>