Global Scalability-load-balancer

[GabrielMelhem]

Acceptance Criteria (ACs):

• distribute the load across multiple servers. By deploying multiple instances of your API across different servers
  • use Software-based Load Balancer (e.g., Nginx)

[GabrielMelhem]

Implemented Load Balancing by using Nginx

steps: 1- Define the Load Balancer Configuration http { upstream urlshortener_backend { least_conn; # Load balance based on the least number of connections server localhost:8080;
server localhost:8082;
server localhost:8083;
}

server {
    listen 80;
    server_name localhost;  

    location / {
        proxy_pass http://urlshortener_backend;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

}

2- define multiple instances of urlshortener service in Docker Compose

urlshortener1: build: . container_name: urlshortener1_container image: urshorterer:latest ports:

• "8080:8081" # Mapping port 8080 on the host to 8081 inside the container depends_on:

• postgres environment: SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/urlshortener_dev SPRING_DATASOURCE_USERNAME: postgres SPRING_DATASOURCE_PASSWORD: 1234 SPRING_PROFILES_ACTIVE: dev

  urlshortener2: build: . container_name: urlshortener2_container image: urshorterer:latest ports:

• "8082:8081" # Mapping port 8082 on the host to 8081 inside the container depends_on:

• postgres environment: SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/urlshortener_dev SPRING_DATASOURCE_USERNAME: postgres SPRING_DATASOURCE_PASSWORD: 1234 SPRING_PROFILES_ACTIVE: dev

  urlshortener3: build: . container_name: urlshortener3_container image: urshorterer:latest ports:

• "8083:8081" # Mapping port 8083 on the host to 8081 inside the container depends_on:
• postgres environment: SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/urlshortener_dev SPRING_DATASOURCE_USERNAME: postgres SPRING_DATASOURCE_PASSWORD: 1234 SPRING_PROFILES_ACTIVE: dev