Posts Tagged mod_wsgi
These are the steps remaining from our previous article. In order to complete our desired setup we must configure Apache with
mod_wsgi pointing to the new virtual environment.
But before we can even do that, we need to setup
mod_wsgi, which in our case will require building it and installing it from source.
mod_wsgi with our virtual Environment
Detailed explanations for using virtual environments in
mod_wsgi can be found here.
Just by reading over a bit, and based on some prior experience (2+ years ago, though), I was expecting this to be the main pain area of the whole process. From the docs I read that
mod_wsgi has to be compiled against the same version of Python your code will be running under. Which means I will have to build from source, since Ubuntu 9.04′s version of mod_wsgi is linked with its included version of Python 2.6.
First, we must build and install
mod_wsgi to use the correct version of Python. The installation guide for
mod_wsgi is very clear, you just need to follow it. Below are the distilled steps my installation needed.
We start by installing the Apache2 development libraries (which we will need in order to install
mod_wsgi), and downloading
mod_wsgi from its subversion repository.
sudo apt-get install apache2-dev svn co http://modwsgi.googlecode.com/svn/branches/mod_wsgi-2.X mod_wsgi-2.x cd !$
My problem: I have a server running my Django apps that I set up when I had very little experience with Django, and just some more with Python. The configuraton is using Apache and mod_wsgi on Ubuntu, running on the system’s default Python installation (2.6) which has Django 1.1 installed.
I need to update my site, which has been upgraded to use Django 1.2, and would benefit from Python 2.7 (although the site itself runs on 2.6 as well, running the tests requires 2.7, since I use some of the new convenient unittest assertions from that version, e.g.
Upgrading the site will require some migrations, which are not backwards compatible (e.g. some table and field renames). Since all in all will be a delicate intervention, I’d like to create a totally separate environment for testing the revamped site while the previous version is still online. Even if it was not risky, now I know better than when I started, and it’s a good time to switch to a virtual environment setup.
Therefore, in order to proceed we will:
- Install python 2.7 with
- Create a
virtualenvwith that python version
- Install all requirements with
- Make a Copy of the production DB, and migrate
- Run unit tests and test using the development server
- Switch to a production setup with
mod_wsgi, and the new
This article covers all steps but the
mod_wsgi setup, which will have its specific followup.
Read the rest of this entry »