Load Balancer

Very simples HTTP/TCP Load Balancer. Implemented in Python3, single thread, using OS selector. The code contains 4 classes that implement different strategies to select the next back-end server:

1. N to 1: all the requests are routed to a single server
2. Round Robin: the requests are routed to all servers in sequence
3. Least Connections: the request is routed to the server with fewer active connections
4. Least Response Time: the request is routed to the server with less average execution time

At the moment only the first strategy is fully implemented.

Back-end server

The back-end server was implemented with flask. It provides a simple service that computes the number Pi with a certain precision.

Prerequisites

$ python3 -m venv venv
$ source venv/bin/activate
$ pip3 install -r requirements.txt

How to run

$ source venv/bin/activate
$ ./setup.sh

In another terminal

$ curl -s http://localhost:8080/10

Or use a browser to open

http://localhost:8080/10

How to access the load balancer

Go to a browser and open this link. The number after the URL specifies the precision of the computation.

How to Stress Test

$ ./stress_test.sh

Alternative

$ httperf --server=localhost --port=8080 --uri=/100 --num-conns=100 --rate=5

Git Upstream

$ git remote add upstream git@github.com:detiuaveiro/load-balancer.git
$ git fetch upstream
$ git checkout master
$ git merge upstream/master

Authors

• Mário Antunes - mariolpantunes

License

This project is licensed under the MIT License - see the LICENSE.md file for details