Telomere Length Recording Application HowTo Install

Tags: Telomere Length Recording Application HowTo Install Pain in the proverbial UoL LAMP Server

Difficulties

This installations is made more difficult by 3 things:

1. Suse Linux does not have mod_wsgi in its repositories, so you're going to have to compile it.
2. mod_wsgi seems picky about where it picks python apps and libraries from
3. The LAMP servers don't put things where you'd expect them to be.
4. Some other stuff that I don't quite understand

Proceduce

1. HowTo Compile mod_wsgi for LAMP servers
2. Copy the Telomere application from the git repository into /local/ directory.
3. Install virtualenv:

easy_install --install-dir=/local/python virtualenv

For some reason that I can't work out (point 4. above), it would only pick up some of the python libraries from a virtual env and not when they were installed in /local/python/. Maybe this was because of the order that I installed things, but I couldn't get it to work without the virtual environment.

4. Create a virtual environment in the telomere application directory.

cd /local/telomere
/local/python/virtualenv --no-site-packages BASELINE

BASELINE is the name of the virtual environment. It could be called anything, but it's called that! Also note that you need to use the full path to the virtualenv utility, since /local/python isn't in $PATH.

5. Activate the environment, install the required packages, then deactivate:

source BASELINE/bin/activate
easy_install flask
easy_install flask-sqlalchemy
easy_install mysql-python
easy_install flask-login
easy_install python-ldap
deactivate

6. Load the WSGI module into Apache, by editing the file /local/apache2/etc/loadmodule.conf by adding this line at the end.

LoadModule wsgi_module /local/apache2/etc/mod_wsgi.so

This presumes that you've copied the compiled mod_wsgi.so file into the /local/apache2/etc/ directory.

7. Add the WSGI config to the Apache config file /local/apache2/etc/httpd.conf:

<Directory /local/telomere>
    WSGIProcessGroup telomere
    WSGIApplicationGroup %{GLOBAL}
    Order deny,allow
    Allow from all
</Directory>

WSGIDaemonProcess telomere user=wwwrun threads=5 python-path=/local/telomere/BASELINE/lib/python2.6/site-packages:/local/python:/usr/lib64/python2.6/site-packages:/usr/share/doc/packages/ home=/local/telomere/
WSGIScriptAlias / /local/telomere/app/telomere.wsgi

The two hard won things here are the values for the python-path and home arguments. The python-path must contain every directory where python libraries are installed, including a sub-directory of the virtualenv directory you created earlier. The home must point to your application directory, or you won't be able to pick up your own modules.

8. Restart apache:

sudo /etc/init.d/uol.apache2 restart

9. Pray.

Other Possible Stuff

1. You may need to give wwwrun extra permissions to the /local/telomere directory.
2. You might need to pray a bit more.

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