Hello Graham,
I'm going to try to address your questions:
*Inside my Virtual Host*
Alias /static /data/home/user/project/frontend/build/static
<Directory /data/home/user/project/frontend/build/static>
Require all granted
</Directory>
<Directory /data/home/user/project/my_project>
<Files wsgi.py>
Require all granted
</Files>
</Directory>
WSGIScriptAlias / /data/home/user/project/my_project/wsgi.py
WSGIDaemonProcess my_project python-path=/data/home/user/project
python-home=/data/home/user/environment/venv
WSGIProcessGroup my_project
*Inside apache2.conf*
WSGIApplicationGroup %{GLOBAL}
*On the apache/error.log*
When I get the 503 on the access.log, these are the types of errors seen on
the error.log
*One type of error*
[Thu Sep 01 04:22:21.520772 2022] [wsgi:error] [pid 3267:tid
140518453380864] [client 118.126.82.157:37722] Timeout when reading
response headers from daemon process 'my_project':
/data/home/project/my_project/my_project/wsgi.py
*Another type of error*
[Thu Sep 01 04:27:00.053558 2022] [wsgi:error] [pid 3267:tid
140518595991296] (11)Resource temporarily unavailable: [client
172.31.17.102:31880] mod_wsgi (pid=3267): Unable to connect to WSGI daemon
process ' my_project ' on '/var/run/apache2/wsgi.2385.1.1.sock' after
multiple attempts as listener backlog limit was exceeded or the socket does
not exist.
Thanks,
Juan Khawly
On Thursday, September 1, 2022 at 5:54:43 PM UTC-4 Graham Dumpleton wrote:
> Would need to see the mod_wsgi configuration you are using to configure
> the WSGI application, including how WSGIDaemonProcess is configured and
> whether you are using WSGIApplicationGroup. Also, what errors are in the
> Apache error log when the 503 errors occur.
>
> On 2 Sep 2022, at 4:57 am, Juan Khawly <[email protected]> wrote:
>
> Hello,
>
> I've been running into this problem for a while.
>
> *CONTEXT *
>
> I have an application developed in python (3.10), django 4.0.3, using
> mod_wsgi and apache. The application is in a DEV environment and hosted in
> AWS EC2. Currently, it does not receive traffic at all.
>
> *Installation of Mod WSGI*
> apt-get install -y apache2-dev
>
> *Setup out of the VENV*
> mod_wsgi-express install-module
>
> editing: /etc/apache2/mods-available/wsgi.load
>
> LoadModule wsgi_module "/usr/lib/apache2/modules/
> mod_wsgi-py310.cpython-310-x86_64-linux-gnu.so"
> WSGIPythonHome "/data/home/user/environment/venv"
>
> *Module Enabled*
> a2enmod wsgi
>
> *PROBLEM*
>
> The application works perfect most of the time. Couple of times a week,
> without traffic the apache server goes down into 503. Usually it is
> preceded by a random request but it does not always happen that way. I am
> assuming that is Slow DDOS but I want to make sure it is not miss
> configuration of the WSGI.
>
> access.log example
>
> <access.PNG>
>
> error.log example
> I masked the internal routes
>
> *This is one of the errors:*
> [Thu Sep 01 04:22:21.520772 2022] [wsgi:error] [pid 3267:tid
> 140518453380864] [client 118.126.82.157:37722] Timeout when reading
> response headers from daemon process 'XXXXX':
> /XXX/XXXX/XXXXX/XXXXX/XXXXXX/wsgi.py
>
> *Another type of error:*
> [Thu Sep 01 04:22:21.520772 2022] [wsgi:error] [pid 3267:tid
> 140518453380864] [client 118.126.82.157:37722] Timeout when reading
> response headers from daemon process 'XXXXXXX':
> /XXX/XXXX/XXXXX/XXXXXX/XXXXXXX/wsgi.py
>
> *SOLUTION*
>
> If I restart the server, all works again until next failure.
>
> I've enabled the following modules, in case it is SlowDDOS
> modreqtimeout
> libapache2-mod-qos
> libapache2-mod-security2.
>
> Any recommendation?
>
> Thanks,
> Juan Khawly
>
>
>
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> .
> <access.PNG>
>
>
>
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