===== How to Enable CloudLinux Python and Ruby Selector (alt-mod_passenger) for LSWS =====
To enable Python or Ruby on a shared hosting environment instead of a dedicated VPS environment, CloudLinux Python and Ruby Selector is recommended. If it is not for a shared hosting environment, you can refer to [[litespeed_wiki:other-ext-apps#archive|our archive section]] for LSWS native setup.

The Python and Ruby Selector allows end users to select the specific version of Python or Ruby they need.

===== Requirements =====
  * LiteSpeed Web Server 5.2+
  * CloudLinux

===== Steps to Enable Python and Ruby Selector =====
  - Make sure Python and Ruby Selector works properly under Apache (follow [[https://docs.cloudlinux.com/index.html?python_and_ruby_selector.html|CloudLinux instructions]] to install and configure).
  - Test a Ruby or Python application with Apache and ensure it is running OK. 
  - Run script to install required ruby/python lsapi modules: <code>/usr/local/lsws/admin/misc/enable_ruby_python_selector.sh</code>
  - Switch to LiteSpeed and try a ruby/python app

===== Troubleshooting =====
If your application does not work properly, you can try two simple steps to check if the application has been setup properly:
  - If possible, switch back to Apache temporarily to verify if the application works properly under Apache.
  - Check if any error has been logged into ''<APP_ROOT_DIR>/stderr.log''. If it has, fix the error and try again.

For example:

A Python application writes an error to stderr.log under the application root directory, ''/home/user1/dingodossier/mbntp/stderr.log'':

<code>
Traceback (most recent call last):
  File "/home/user1/dingodossier/mbntp/passenger_wsgi.py", line 8, in <module>
    wsgi = imp.load_source('wsgi', 'mbntp/wsgi.py')
  File "/home/user1/virtualenv/dingodossier_mbntp/3.4/lib64/python3.4/imp.py", line 171, in load_source
    module = methods.load()
  File "<frozen importlib._bootstrap>", line 1220, in load
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "mbntp/wsgi.py", line 10, in <module>
    from django.core.wsgi import get_wsgi_application
ImportError: No module named 'django'
</code>

This indicates Django was not properly set up for the application.