Hi,

IMHO the simplest way is to use cron.


Since you are working with Docker, one option is to add a container to your 
stack, sharing the same image as your Django app so that it can run the 
management command implementing your periodic process. Configure this container 
so that the command it runs is the cron daemon, and of course schedule your 
periodic task in the crontab.


Some people use Gunicorn start hook to fork a sub-process running the cron 
daemon. Others embed supervisor in a container and manage the web app process 
and the other ones with it. Although it works,  such approaches go against the 
rule which says that a Docker container should handle only one thing (either 
the app server or the cron stuff in you case) so that it can be managed 
independantly (scale, update image, restart...).


This is important when you deploy your stack under the control of an 
orchestrator such as Kubernetes, which will manage the containers (err. the 
"pods") automatically so that the state or the stack is the targeted one WRT 
replicas count, resource limits...


Hope this helps.


Eric

________________________________
From: django-users@googlegroups.com <django-users@googlegroups.com> on behalf 
of Bartosz Gańcza <gart...@gmail.com>
Sent: Friday, November 2, 2018 3:31:38 PM
To: django-users@googlegroups.com
Subject: Running a custom code after the server is up

Hi everyone!

I am somewhat of a Django beginner and I can't seem to find an easy solution to 
what I need to do anywhere.

I have a web scraping code I wish to run in the background automatically (once) 
after the server is up and running. I use Docker to fire up the DB and the web 
server itself but can't seem to be able to configure it to also fire up the 
management command I configured that runs the scraping code (I guess using 
Docker for that is either beyond my current knowledge or is just not possible 
without using specialised tools like cron, which I don't fully understand).

Is there any way to do something like this in Django itself, without resorting 
to "ready" function? (I did that at first but it stops the server from running 
until the code completes and also runs it at least twice)

Best,
Bartosz

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