haproxy_fun

About

A testing ground set up for me to learn more about haproxy and load balancing, used with simple Python servers for calculating basic math operations, with some regard to BEDMAS.

Requirements

• Python 2.7.6+
• haproxy (I used version 1.4.24)
• pip
• Python packages specified by requirements.txt, you can install by pip install -r requirements.txt

How to use

1. Run python start.py to start haproxy, and load all the servers specified in haproxy.ini
2. You can make HTTP calls to the following url: http://localhost:8000/calculate/<problem>/, where <problem> is a math problem that the server(s) try to solve. All integers and decimal points are accepted, and the following notations are used for specific math operations:

• + for addition
• - for subtraction
• * for multiplication
• d for division

3. See the HTTP response with a stack trace.

How to add more servers

• Edit haproxy.ini to add more servers.
• Fill in a new server (as a new section) with the following: [server_<unique_name>]
• Fill in any options regarding the server with regards to add, subtract, multiply, divide. The corresponding value can be 0 (off) or 1 (on).
• Any missing option for the server would be assumed 1.