For quite a while I couldn’t figure out how to deploy Python web apps. But with patience and tinkering, I slowly figured it out.
Here were my steps:
1. Setup Domain
I created an A record for python.davidxia.com in my DNS records pointing to the IP of the server on which I developed.
2. Setup Apache VirtualHost
I put this in
/etc/apache2/sites-available/davidxia (using Ubuntu 10.04):
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WSGIScriptReloading On makes mod_wsgi reload all the daemon processes whenever something
changes the .wsgi file. This makes it convenient to make code changes and run:
3. Install Python Framework
To keep things simple, I’ll use Flask, a micro web framework for Python, as an example of how to get a web app up and running.
pip install Flask
4. Create Flask Hello World
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5. Fix mod_wsgi Threading Errors (optional)
I noticed dozens of these errors in my Apache error log:
[error] Exception KeyError: KeyError(-1219327344,) in ignored
They are apparently harmless, but I wanted to get rid of them since they’re annoying to see. I fixed it by updating mod_wsgi to version 3.3. This wasn’t in Ubuntu’s repository, so I downloaded version 3.3, stopped Apache, installed from source, and restarted Apache.
I pointed my browser at python.davidxia.com and got “Hello World!”