🚀 Terraform AWS 3-Tier Architecture

✨ This repository is created to learn and deploy a 3-tier application on aws cloud through Terraform.

🏠 Let's set up the variable for our Infrastructure

Create one file with the name terraform.tfvars

vim terraform.tfvars

🔐 ACM certificate

To use ACM certificate, go to AWS management console --> AWS Certificate Manager (ACM) and make sure you have a valid certificate in Issued status, if not, feel free to create one and use the domain name on which you are planning to host your application (Not Mandatory).

👨‍💻 Route 53 Hosted Zone

To user Route 53 hosted zone, go to AWS management console --> Route53 --> Hosted Zones and ensure you have a public hosted zone available, if not create one (Not Mandatory).

🛡 Create Private and Public Key

In order to initiate AWS EC2 instance you need to have a key pair (public and private key). So remove any key (my-key.pem, my-key.pub) in following directory ./modules/key/* then recreate your own keys using following command:

$ cd ./modules/key
$ ssh-keygen -t rsa -b 4096 -f ./my-key.pem
$ mv my-key.pem.pub my-key.pub

Add the below content into the terraform.tfvars file and add the values of each variable.

region                  = ""
project_name            = ""
vpc_cidr                = ""
pub_sub_1a_cidr         = ""
pub_sub_2b_cidr         = ""
pri_sub_3a_cidr         = ""
pri_sub_4b_cidr         = ""
pri_sub_5a_cidr         = ""
pri_sub_6b_cidr         = ""
db_username             = ""
db_password             = ""
certificate_domain_name = ""
additional_domain_name  = ""
bucket_name             = ""

⚙️ Verify the resources

After completing above steps make sure you have enable route53 resource ./modules/route53/main.tf, cloudfront acm certificate and aliases ./modules/cloudfront/main.tf. Finally, make changes to auto scaling group ./modules/asg/config.sh accordingly to deploy your application on following aws 3 tier architecture.

✈️ Now we are ready to deploy our application on the cloud

👉 Let install dependency to deploy the application

terraform init 

Type the below command to see the plan of the execution

terraform plan

✨ Finally, HIT the below command to deploy the application

terraform apply 

Type yes, and it will prompt you for approval.

♾️ Automate

In order to automate the task and start the CI/CD pipeline, you will need a dedicated EC2 instance configured as a self-hosted runner in GitHub Actions. Set it up by registering the instance as a new self-hosted runner in your repository's GitHub Actions settings then name the runner as git-workflow as shown below. Please make sure to attach a suitable role with necessory permission to this instance while laungching or through Instances --> Actions --> Security --> Modify IAM role.

Note

If you not aware or doing this type of work in first time, please refer my terraform-aws-2-tier-architecture --> Steps to setup CICD Pipeline

To receive pipeline deployment notifications, configure your Slack channel's webhook URL. Add this webhook URL as a repository secret in GitHub Actions --> Secrets and Variables --> Repository secrets, and name it SLACK_WEBHOOK_URL.

Upon successful execution, the pipeline will deploy a fully functional application in a 3-Tier Architecture on AWS Cloud.

Output

Sample Application

Pipeline

Slack Channel Notifications