> On 11 Mar 2016, at 10:04 AM, Nana Okyere <[email protected]> wrote:
>
> Graham,
> Great post. In my current set up, I have multiple flask python applications
> hosted on multiple virtual hosts.
> I have created only one virtual environment that all the applications use.
>
> Outside of all the virtual hosts, I have:
> ##########################################
> WSGISocketPrefix /var/run/wsgi
> WSGIPythonHome /WebHA/catworld/featureanalytics-443S/webpython #folder of
> my virtualenv
> ########################################
>
> Then in each virtual host, I have among others:
> #########################################
> DocumentRoot "/WebHA/catworld/featureanalytics-443S/workforce_tool/"
> ServerName wpat.cat.com
> ServerAlias wpat.cat.com
>
> WSGIDaemonProcess wpat.cat.com user=http group=http processes=4 threads=4
> WSGIProcessGroup wpat.cat.com
> WSGIPassAuthorization On
>
> WSGIScriptAlias /
> /WebHA/catworld/featureanalytics-443S/workforce_tool/workforce_tool.wsgi
> Alias /static /WebHA/catworld/featureanalytics-443S/workforce_tool/app/static
>
> <Directory /WebHA/catworld/featureanalytics-443S/workforce_tool/app/static/>
> Order allow,deny
> Allow from all
> </Directory>
> #######################################
>
>
> The corresponding wsgi file for the above virtual host is:
> ###############################################
> #workforce_tool.wsgi
>
> #!/WebHA/catworld/featureanalytics-443S/webpython/bin/python
>
> activate_this =
> '/WebHA/catworld/featureanalytics-443S/webpython/bin/activate_this.py'
> exec(open(activate_this).read())
>
> import sys
> import logging
>
> logging.basicConfig(stream=sys.stderr)
> sys.path.insert(0,"/WebHA/catworld/featureanalytics-443S/workforce_tool/")
>
> from app import theapp as application
> application.secret_key = 'mykey'
> #############################################
>
> Python 3.4.3
> mod_wsgi 4.4.22
> Daemon mode
>
>
> I followed a tutorial online to set things up this way.
> For other reasons, I have to switch to use anaconda/conda distribution of
> python. So I'll be creating conda environments for each app.
Before you can even do that, mod_wsgi would need to be uninstalled and
recompiled from source code against the Anaconda Python distribution you want
to use. I am not sure how well that will work as I have seen mixed reports
about the Anaconda distribution and whether it will work. The issue I have
heard of was with older versions, so later versions of Anaconda may work better.
> 1. How will the code in the wsgi file change especially about activating the
> python environment?
The activation of the Python virtual should be removed. You shouldn’t do it
that way. Also don’t modify sys.path either.
> 2. How will my set up change to use a different conda environment for each
> app/virtual host? I want to move away from using one environment for every
> python app.
You must have each application delegated to its own mod_wsgi daemon process.
Outside of all VirtualHost’s add:
WSGIRestrictedEmbedded On
so you don’t accidentally run stuff in embedded mode.
You should then use options to WSGIDaemonProcess to specify the location of the
virtual environment using the python-home option. Use python-path option to
specify other directories to search.
WSGIDaemonProcess wpat.cat.com user=http group=http processes=4 threads=4
python-home=/WebHA/catworld/featureanalytics-443S/webpython
python-path=/WebHA/catworld/featureanalytics-443S/workforce_tool
WSGIProcessGroup wpat.cat.com <http://wpat.cat.com/>
WSGIApplicationGroup %{GLOBAL}
WSGIScriptAlias /
/WebHA/catworld/featureanalytics-443S/workforce_tool/workforce_tool.wsgi
This config assumes one application per VirtualHost.
Note that have added WSGIApplicationGroup to force use of main Python
interpreter context. This helps with some third party C extension modules for
Python that will not work in sub interpreters. It is okay to override so long
as only running one application per daemon process group.
For some reading see:
http://blog.dscpl.com.au/2014/09/using-python-virtual-environments-with.html
<http://blog.dscpl.com.au/2014/09/using-python-virtual-environments-with.html>
http://blog.dscpl.com.au/2014/09/python-module-search-path-and-modwsgi.html
Graham
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