GoBalance

Overview

This guide provides instructions for building and deploying the load balancer application. The application consists of an app server and a load balancer, managed using AWS CDK

Prerequisites

Before you can run the application, ensure you have the following installed:

1. Go: Version 1.16 or later.

   • Download from golang.org/dl
   • Installation guide

2. Node.js: Version 14 or later.

   • Download from nodejs.org
   • Installation guide

3. AWS CDK: Version 2.x.

   • Install it globally using npm:

     npm install -g aws-cdk

   • AWS CDK Getting Started

4. AWS CLI: Version 2.x and configured with appropriate credentials.

   • Installation instructions at aws.amazon.com/cli
   • Configuration guide
   • Make sure you have configured your AWS CLI with:

     aws configure

5. ZIP utility: To create ZIP archives.

   • This is usually pre-installed on most Unix-like systems.
   • For Windows, you can use 7-Zip

6. Environment Setup

   • Create .env.local file with placeholder environment variables
   • Copy .env.local to .env and fill in actual values

     cp .env.local .env

   • Modify .env with your specific configuration values

• Refer this in case of issues.

7. Create config.yaml :
   • Make a config.yaml file in the deploy_scripts directory.
   • Example :

worker: 3                 # minimum number of worker nodes
max_workers: 6            # maximum number of worker nodes
pool: 30                  # number of allowed concurrent incoming requests
stats-dir: /tmp/stats     # location of the stats directory
failure: 20               # failure percentage

Directory Structure

GoBalance/
├── app_server/
│   ├── main.go
│   ├── other files and directories
│   └── //...
│
├── load_balancer/
│   ├── main.go
│   ├── other files and directories
│   └── //...
│
└── deploy_scripts/
│   ├── assests/
│   ├── deploy_scripts.go
|   ├── config.yaml
│   ├── other files and directories
│   └── //...
├── Makefile
├── .env
└── other files

Makefile Commands

The Makefile provides the following commands:

• build: Compiles Go applications for Linux (amd64) and creates ZIP archives
  • Builds app_server and load_balancer binaries
  • Creates ZIP archives for both components
• deploy: Deploys the application using AWS CDK without requiring manual approval
• destroy: Destroys AWS resources created by CDK
• clean: Removes compiled binaries and ZIP files
• test: Runs the test script
• all: Performs a complete deployment cycle:
  1. Attempts to destroy existing resources
  2. Cleans up files
  3. Builds the application
  4. Deploys to AWS

Running the Application

Step 1: Build the Application

To compile the applications and create ZIP files, run:

make build

Step 2: Deploy the Application

To deploy the application to AWS, run:

make deploy

Step 3: Clean Up (Optional)

To clean up the generated files and resources, you can run:

make clean

Step 4: Destroy Resources

If you want to destroy the deployed resources, run:

make destroy

Step 5: Running Tests

To execute the test script:

make test

Step 6: Run All Steps

To run all steps (destroy, clean, build, and deploy) in one command, run:

make all

Note: The make all command will continue executing even if the make destroy step fails.

Troubleshooting

• Ensure you have the correct permissions set in your AWS account.
• Check your Go and Node.js versions if you encounter compatibility issues.
• If you face issues with CDK, try running cdk bootstrap to set up the required resources. See CDK Bootstrapping for more information.