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Load Balancer over TCP

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Assgn-3.pdf
Assgn-3.pdf
 
 
README.md
README.md
 
 
client.c
client.c
 
 
lb.c
lb.c
 
 
server.c
server.c
 
 

README.md

Load Balancer over TCP

This Assigment implements a simplified version of a load balancer, which balances the load between two computation servers (S1 and S2) based on their current load. It also provides a service for clients to request the date and time.

Functionality

  • S1 and S2: Wait for a request from the load balancer (L). When a request to send the current load is received, the server generates a random integer between 1 and 100 as a dummy load and sends it to L. If it receives a client service request, it fulfils the service and sends the result back to L.

  • L: Periodically (every 5 seconds) asks both S1 and S2 for their load by sending a message "Send Load". It stores the received load as the last known load of the servers in a table, and closes the connection. When it receives a load value, it prints "Load received from ", where is the IP address of S1 or S2 whose load is being asked, and is the load value received. If a client requests a service, L finds the server with the lower load and sends the string "Send Time" to that server, and prints a message saying "Sending client request to ", where is the IP of the server the request is sent to. The server sends the date and time back to L, which sends it to the client. L acts as a server to the clients and as a client to S1 and S2.

  • Clients: Connect to L to request the date and time. When the connection is made, it waits to receive the date/time from L, after which it closes the connection.

Usage

  1. Compile the code using the following command:
gcc -o server server.c
gcc -o lb lb.c
gcc -o client client.c
  1. Start the computation servers (S1 and S2) by running the following command:
./server <port_number>
  1. Start the load balancer (L) by running the following command:
./lb <load_balancer_port_number> <server_1_port_number> <server_2_port_number>
  1. Start the clients by running the following command:
./client <load_balancer_port_number> <port_number>

Note: The port number must be different for each instance of the servers/ clients. Pass the correct port numbers as command line arguments.

The complete assignment description can be found in the Assgn-3.pdf file. The relevant submitted files are:

  • server.c
  • lb.c
  • client.c