This repository contains Terraform code to create a VM instance on Google Cloud Platform (GCP) with auto-scaling policies, security measures, and a simple web application deployment.
- GCP Account: Ensure you have a GCP account and a project created.
- Terraform Installed: Install Terraform on your local machine.
- GCP Credentials : Download the service account key JSON file from GCP and ensure it has the necessary permissions to create resources.
Replace the following placeholders in the main.tf file with your GCP project details:
- Project ID: Replace
"m23aid055-pritish-vcc-ass2"with your GCP project ID. - Credentials: Replace
"/Users/pktsangs/Downloads/m23aid055-pritish-vcc-ass2-7be51308fb86.json"with the path to your GCP service account key JSON file. - Region/Zone* Replace
"us-central1"and"us-central1-a"with your desired region and zone.
Run the following command to initialize Terraform and download the necessary providers:
terraform initRun the following command to see the execution plan:
terraform planThis will show you the resources that Terraform will create.
Apply the Terraform configuration to create the resources:
terraform applyType yes when prompted to confirm the creation of resources.
Once the Terraform script completes, verify the following resources in your GCP console:
- VPC Network: A VPC network named
m23aid055-my-vpc-networkwill be created. - Firewall Rules: Two firewall rules will be created to allow HTTP (port 80) and SSH (port 22) traffic.
- Instance Template: An instance template named
m23aid055-my-instance-templatewill be created. - Managed Instance Group (MIG): A MIG named
m23aid055-my-migwill be created with auto-scaling policies. - Health Check: A health check named
m23aid055-my-health-checkwill be created to monitor the instances.
Once the instances are up and running, you can access the web application by navigating to the public IP address of the instance group in your web browser.
To destroy the resources created by Terraform, run:
terraform destroyType yes when prompted to confirm the destruction of resources.
- IAM Roles: Ensure that the service account used has the minimum necessary permissions to create and manage resources.
- Firewall Rules: Firewall rules are configured to allow HTTP and SSH traffic only. Adjust the
source_rangesto restrict access to specific IP ranges if needed.
The auto-scaling policy is configured to scale the number of instances based on CPU utilization:
- Min Replica: 1
- Max Replicas: 8
- Target CPU Utilization: 50%
The instances will scale up when the CPU utilization exceeds 50% and scale down during periods of low usage.
A health check is configured to monitor the health of the instances. If an instance fails the health check, it will be automatically replaced.
The public IP address of the instance group will be displayed as an output after running terraform apply.
- Terraform Errors: Ensure that your GCP credentials are correct and that the service account has the necessary permissions.
- Instance Not Reachable**: Check the firewall rules and ensure that the instance is running and healthy.