2 web.py apps on a box - seeing apache errors

[Megha Vishwanath]

Hi,

We've noticed this error in our apache logs. We have two web.py apps deployed on the same box one at  /srv/www_app  and the other at /srv/misc/modinterface

Their apache configs are separate and they run on different ports even. Their interaction with each other is limited. When content is added on www_app, it gets moderated via the modinterface app. They both talk to a common database where moderation flags get set.

However as you can see below, in a completely unrelated context, the os path in the www_app is referring to the path of the moderator interface. Are there any apache/ mod wsgi config guidelines we've missed in deploying two web.py apps one beside the other on this box.

Tue Sep 18 11:03:51 2012] [error] Traceback (most recent call last):
[Tue Sep 18 11:03:51 2012] [error]   File "/srv/www_app/klp.wsgi", line 1298, in GET
[Tue Sep 18 11:03:51 2012] [error]     dirList=os.listdir(os.getcwd() + path + "/demographics/English")
[Tue Sep 18 11:03:51 2012] [error] OSError: [Errno 2] No such file or directory: '/srv/misc/modinterface/reports/demographics/English'

Regards,

Megha 

[Megha Vishwanath]

Just to add, these are versions for Apache/mod_wsgi/python

Apache/2.2.22 (Debian) mod_wsgi/3.3 Python/2.7.3rc2

[Marios Zindilis]

Are the two applications running under the same domain? There are some
complications in WSGI function if they are.

I managed to run multiple web.py apps, described in this previous list
message:

https://groups.google.com/forum/#!topic/webpy/CKC5EeXlk_I

On 09/18/2012 10:03 AM, Megha Vishwanath wrote:
> Just to add, these are versions for Apache/mod_wsgi/python
>

> *Apache/2.2.22 (Debian) mod_wsgi/3.3 Python/2.7.3rc2
> *

> On Tue, Sep 18, 2012 at 12:19 PM, Megha Vishwanath
> <megha.vi...@gmail.com <mailto:megha.vi...@gmail.com>> wrote:
>
> Hi,
>
> We've noticed this error in our apache logs. We have two web.py apps

> deployed on the same box one at */srv/www_app* and the other at
> */srv/misc/modinterface*
> *
> *

> Their apache configs are separate and they run on different ports
> even. Their interaction with each other is limited. When content is
> added on www_app, it gets moderated via the modinterface app. They
> both talk to a common database where moderation flags get set.
>
> However as you can see below, in a completely unrelated context, the
> os path in the www_app is referring to the path of the moderator
> interface. Are there any apache/ mod wsgi config guidelines we've
> missed in deploying two web.py apps one beside the other on this box.
>
> Tue Sep 18 11:03:51 2012] [error] Traceback (most recent call last):

> [Tue Sep 18 11:03:51 2012] [error] File "*/srv/www_app/*klp.wsgi",

> line 1298, in GET
> [Tue Sep 18 11:03:51 2012] [error]
> dirList=os.listdir(os.getcwd() + path + "/demographics/English")
> [Tue Sep 18 11:03:51 2012] [error] OSError: [Errno 2] No such file

> or directory: *'/srv/misc/modinterface/*reports/demographics/English'
>
> Regards,
> Megha
>
>
>
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[Megha Vishwanath]

Hi Mario,

Sorry, we're only trying this now, after very long.

And changes suggested here didn't work for us. Do we need to make changes in the wsgi file as well? 

Yes, they run under the same domain. If we resolve this, will it still be a problem then? 

-Megha

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[Jason Macgowan]

Can you post your apache config files?

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[Megha Vishwanath]

This:

For App 1

<VirtualHost *:80>

    ServerName www.domain.com

    RewriteEngine On

    RewriteCond %{THE_REQUEST} /schoolpage/

    RewriteRule ^(.*)\/(\?.*)?$ $1$2 [R=301,L]

    CustomLog /srv/domwww/logs/access.log common

    ErrorLog /srv/domwww/logs/error.log

    Alias /css /srv/domwww/css

    Alias /images /srv/domwww/images

    Alias /reports /srv/reports

    Alias /rawdata /srv/rawdata

    Alias /uploaded_images /srv/uploaded_images

    Alias /js /srv/domwww/js

    Alias /yui /srv/domwww/yui

    Alias /flot /srv/domwww/flot

    Alias /sslc /srv/domwww/sslc

    Alias /robots.txt /srv/domwww/robots.txt

    

    <Directory /srv/domwww/>

   WSGIApplicationGroup %{GLOBAL}

   AddHandler wsgi-script .wsgi

   allow from all

   </Directory>

</VirtualHost>

For App 2

<VirtualHost *:8005>

    ServerName www.domain.com

    LogLevel debug

    CustomLog /srv/domMisc/modinterface/logs/access.log common

    ErrorLog /srv/domMisc/modinterface/logs/error.log

    Alias /css /srv/domMisc/modinterface/css

    Alias /js /srv/domMisc/modinterface/js

    Alias /images /srv/domMisc/modinterface/images

    Alias /templates /srv/domMisc/modinterface/templates

    Alias /favicon.ico /srv/domMisc/modinterface/favicon.ico

    Alias / /srv/domMisc/modinterface/modinterface.wsgi

    <Directory /srv/domMisc/modinterface>

        AddHandler wsgi-script .wsgi

        WSGIApplicationGroup %{GLOBAL}

        Allow from all

    </Directory>

</VirtualHost>

Regards,

Megha 

neoWarli.com | dreamSchoolForum.blogspot.com | www.klp.org.in

[Marios Zindilis]

Maybe the problem is that you have two VirtualHost definitions for the same domain. I have posted my current working VirtualHost configuration here:

https://gist.github.com/4671242

The only difference to the configuration in production is that the domain is not actually example.com, and the IP from which the test applications are accessible is that of our proxy server.

Let me know if further explanations are necessary.

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[Megha Vishwanath]

Hey,

I see that in your set up perhaps one may approach the different apps using example.com/books or example.com/blog, is that right?

I don't want the second app to render on port 80 and these are 2 very distinct web py apps and have nothing to do with each other.
So, would you recommend I use a different Domain name for the second application?

-Megha

[Marios Zindilis]

Oops, I didn't notice that you were using different ports for different applications. 

I made a couple of quick tests, of course Apache can listen on multiple ports and WSGI apps can run on different ports, so here's what I did to (kind of...) simulate your setup:

 

1. Added "Listen 8080" to my Apache configuration.

2. Copied my working VirtualHost definition to a new file, changed the port to 8080 in that file.

3. Restarted apache.

With the above setup I had two VirtualHost definitions, like the one I posted earlier, which were identical to each other, apart from the line:

<VirtualHost *:80> 

Which was in the second file:

<Virtualhost *:8080>

With this setup, every web.py app is served on _both_ ports. Then:

1. I commented out the "blog" application from the <VirtualHost *:80> (The "alias" line and the Directory definition)

2. I commented out every other application except "blog" from the <VirtualHost *:8080>

3. Restarted Apache.

This way, all applications were served on port 80, except "blog" which was on port 8080. I hope this is clear enough. Try to replicate my setup on your server, and monitor your error logs for hints on what might be going wrong.

[Marios Zindilis]

Also, to answer to your questions:

You said:

> I see that in your set up perhaps one may approach the different apps using example.com/books or example.com/blog, is that right?

Yes, /books and /blog are completely separate applications. different database, different files, and _each_ has its own:

application = web.application(urls, globals()).wsgifunc()

You said:

> I don't want the second app to render on port 80 and these are 2 very distinct web py apps and have nothing to do with each other.

> So, would you recommend I use a different Domain name for the second application?

It seems that you can do what you want with just one domain name, but a different one, or a subdomain (separate VirtualHost, port 80), would simplify the situation.