Configure ALB and Target Group

1. Create Target Group

1.1. Basic Target Group Configuration

1. Access EC2 Console > Target Groups > Create target group
2. Specify group details:
   • Choose a target type: Instances
   • Target group name: nodejs-app-tg
   • Protocol: HTTP
   • Port: 9000
   • VPC: Select created VPC
   • Protocol version: HTTP1

1.2. Health checks

1. Health check settings:

   • Protocol: HTTP
   • Path: /health

   Note: Must Add Health Check Route to Project

   // Add to app.js or routes
   app.get('/health', (req, res) => {
   res.status(200).json({
      status: 'OK',
      timestamp: new Date(),
      uptime: process.uptime()
   });
   });
   

   • Port: traffic port (9000)
   • Healthy threshold: 2
   • Unhealthy threshold: 3
   • Timeout: 5 seconds
   • Interval: 30 seconds
   • Success codes: 200-299

1.3. Register Targets

Click “Create target group”

2. Create Application Load Balancer

2.1. Basic Configuration

1. Access EC2 Console > Load Balancers > Create Load Balancer
2. Choose Application Load Balancer
3. Basic configuration:
   • Name: nodejs-app-alb
   • Scheme: Internet-facing
   • IP address type: IPv4

2.2. Network Configuration

1. Network mapping:

   • VPC: Select created VPC
   • Mappings: Select at least 2 AZs and public subnets

2. Security Groups:

   • Select alb-sg
   • Verify rules:
     • HTTP (80) from 0.0.0.0/0
     • HTTPS (443) from 0.0.0.0/0

2.3. Listeners

1. HTTP:80
   • Protocol: HTTP
   • Port: 80
   • Default action: Forward to nodejs-app-tg

2.4. Review and Create

1. Review configuration
2. Click “Create load balancer”

References

1. ALB Documentation
2. Target Groups
3. ALB Monitoring

Complete!