[Flask] Deploying as a Windows service

[CCP Dragonedge]

Hi Unai,

Thanks for taking the time.

With regards to (1), I didn't see anything more meaningful. Inside my
myapp.py, I do a "from module wfADM import wfUser". It just says it
couldn't find module wfADM.

As for (2), before I installed mod_wsgi, I did test it out as a Windows
service on a simple html file - no problems.

This is the entire scenario (sorry in advance for this long post):

Initially, I had Python 2.7, Flask, and MySQL 8 running on a Windows 7 box.
This wasn't my development machine, it was going to be production, but I
just wanted to make sure that everything worked, as I had never worked with
Apache before. Then, I installed Apache 2.4 - pleasantly surprised that it
was really easy. No problem as a Windows service, either (i.e. httpd -k
install, then going into Services and starting it up).

So, apart from Apache, my production and development machines were
basically identical. Therefore, I tried to install mod_wsgi on my
DEVELOPMENT machine - and ran into all sorts of pain. After a very helpful
exchange with the mod_wsgi boss, Graham Dumpleton, on Github (#347), my
conclusion was that I had to use Python 3.6. After doing that (the only
real change I had to make was changing MySQLdb to pymsql), I then managed
to install mod_wsgi 4.5.4 (after much effort - I finally realized I had to
install the latest Visual C++ compilers from Microsoft). Then, everything
worked fine (now that I think of it, I didn't try to set up Apache as a
Windows service on my development machine - I'll give that a shot when I
have a bit more time).

Regardless, I basically did this on my PRODUCTION environment based on my
experience on my development box:

0) Apache24 and MySQL 8 already installed, so I just left them
1) Uninstalled Python 2.7, which also gets rid of Flask
2) Installed Python 3.6
3) Installed Flask
   - tested my application on the Flask server; worked without any problems
4) Installed mod_wsgi
   - had to install the Visual C++ compilers, but after that, no issues
5) Set up the virtual host and the wsgi file, which leads to....

Current situation:
When I manually start up Apache by just typing httpd.exe on the command
line, no problems accessing my Flask app from Apache. But when I try to set
up Apache as a Windows service (httpd -k install, and then going to
Services), I get the problem above (unable to see my modules).

Thanks for taking the time to read this!
p

On 6 August 2018 at 02:10, Unai Rodriguez <unai at sysbible.org> wrote:

> Hi,
>
> (1) Is there any more specific error on Apache error logs?
>
> (2) I’d make sure first Apache starts properly as a service. Can you test
> something else (perhaps a simple html page)  to make the Apache service is
> configured properly?
>
> (3) If getting (1) and (2) did not help enough for you to figure it out,
> please submit exact steps on how yo configured Apache to start as a service
> and the Apache configuration for your Flask app
>
> Thanks,
> Unai Rodriguez
> On 5 Aug 2018, 14:31 +0200, CCP Dragonedge <ccp at drsb.com.my>, wrote:
>
> Hi,
>
> I am deploying my Flask application on Apache24 using mod_wsgi 4.5.4
> running on a Windows 7 machine. I have encountered something strange - when
> I start and stop Apache manually (i.e. by typing httpd.exe from the command
> line to start, and just hitting ctrl-C to stop), everything works fine.
>
> When I, however, install Apache as a Windows service (by doing a "httpd -k
> install"; so it starts up when the machine is booted), I get a "500
> internal server error" when I try to access my Flask application.
>
> According to the error logs, Flask can't see my modules. I know it's
> something to do with Apache because when I just run the Flask server
> ("python myapp.py"), I have no problems.
>
> Anyone experience this? If so, how did you overcome this? And I hope this
> isn't off-topic - if it is, sorry and please point me to the right place.
>
> Thanks,
> p
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20180806/58a8696f/attachment.html>