AWS VPC CloudFormation and Terraform Template for a High Resilient Architecture

Overview

This project provides both AWS CloudFormation and Terraform templates for creating a highly resilient Virtual Private Cloud (VPC) architecture across three Availability Zones (AZs). The templates include a well-structured network layout featuring public, NAT, and private subnets, along with the necessary routing components.

Features

• Highly Resilient Architecture: Utilizes multiple Availability Zones (3 AZs) to ensure high availability and fault tolerance.
• Public, NAT, and Private Subnets: Configures public subnets for internet-facing resources, private NAT subnets for secure outbound internet access, and private subnets for internal resources.
• NAT Gateways: Deploys NAT gateways across multiple Availability Zones (AZs) to ensure high availability.
• Flexible Configuration: Allows customization of CIDR blocks, subnet sizes, and availability zones through parameters.
• Network ACLs: Implements Network Access Control Lists (NACLs) for added security at the subnet level.

Architecture Diagram

Prerequisites

• An AWS account with necessary permissions to create VPCs, subnets, NAT gateways, and other related resources.
• AWS CLI.
• Terraform (latest version recommended).

Usage

CloudFormation

1. Clone the repository:

   git clone https://github.com/alonshrestha/aws-vpc-resilient-architecture.git
   cd aws-vpc-resilient-architecture/cloudformation 

2. Update Parameters: Modify the parameters.json file to set the desired values for your project, including:

   • ProjectName: Your project name.
   • Environment: Environment type (e.g., dev, staging, production).
   • VpcCidr: CIDR block for the VPC.
   • PublicSubnets, PrivateNatSubnets, PrivateSubnets: CIDR blocks for subnets.
   • AvailabilityZones: List of available AZs.

3. Deploy the CloudFormation Stack:

   • Using the AWS CLI:

     aws cloudformation create-stack --stack-name YourStackName --template-body file://vpc.yaml --parameters file://parameters.json

4. Monitor Stack Creation: Monitor the progress of the stack creation in the AWS Management Console.

Terraform

1. Clone the repository (if you haven't already):

   git clone https://github.com/alonshrestha/aws-vpc-resilient-architecture.git
   cd aws-vpc-resilient-architecture/terraform 

2. Update Variables: Modify the dev.tfvars file to set the desired values for your project, including:

   • projectName: Your project name.
   • environment: Environment type (e.g., dev, staging, production).
   • vpcCIDR: CIDR block for the VPC.
   • publicSubnetsCIDRList, privateNatSubnetsCIDRList, privateSubnetsCIDRList: CIDR blocks for subnets.
   • subnetsAZList: List of available AZs.

3. Initialize Terraform: Run the following command to initialize the working directory:

   terraform init

4. Plan the Infrastructure: Generate an execution plan to preview changes:

   terraform plan -var-file="dev.tfvars"

5. Deploy the Infrastructure: Apply the configuration to create the resources:

   terraform apply -var-file="dev.tfvars"

6. Monitor Creation: Monitor the progress in the Terraform output.

Customization

Feel free to customize the templates as per your requirements. You can add additional resources like EC2 instances, RDS databases, and more.

Security Considerations

• Review and modify NACL rules based on your security requirements.

Contributing

Contributions are welcome! Please open an issue or submit a pull request for any improvements or enhancements.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Acknowledgments

• AWS Documentation
• CloudFormation and Terraform Template Examples