Dockerizing multi-node python django backend served by nginx - django

I am trying to dockerize a project that consists of multiple backend nodes that are served by a nginx server. Would I rather have an instance of nginx running in each docker container serving just that node or would I have a "central" NGINX server that serves all nodes.
In case of having a central nginx server, how would it communicate with the backend nodes.
The backend is implemented in python django. If each container has its own nginx instance, the communication between the web server and the python django application is straightforward. But how would I serve a python django application that lives in one container from a nginx server that lives in another?
In case of having an instance of nginx in each container, how would that impact the overall performace of the system?

Related

Pointing Nginx to Gunicorn on a different server

I have a bunch of different services running across several lxc containers, including Django apps.
What I want to do is install Nginx on the Host machine and proxy pass to the Gunicorn instance running in an lxc container. The idea is that custom domain names and certs are added on the Host and the containers remain unchanged for different installs.
it works if I proxy_pass from the host to nginx running in a container, but I then have issues with csrf, which for the Django admin, cannot be turned off.
Thus, what I would like to do is only run nginx on the host server connecting to the Gunicorn instance on the lxc container.
Not sure if that will fix the csrf issues, but it does not seem right to run multiple nginx instances

Can i use haproxy for hosting django channels ASGI application instead of daphne?

I was curious to know can i host a ASGI django channels applications with haproxy instead of daphne as i heared it had some security issues.

how to kill gunicorn server inside request response cycle

i have one Django application and one flask application.
it's running with two Gunicorn servers inside the docker containers.
my goal is if the database connection was failed (if db was down), i want to kill the Django app and flask app.
how could i do this ?

Stop nginx in django completely

I have used nginx as web server for django project , And now i want to use my normal django local server (switch to older local server).
I tried
sudo service nginx stop
(It is showing nginx is stopped)
i killed all process too.
But still my localserver:127.0.0.1:8000 is under nginx control.And my computer ip is also under nginx control.(it shows the nginx default page)
I want free that particular port(localserver:127.0.0.1:8000). How can i completely stop nginx ?

What is the purpose of NGINX and Gunicorn running in parallel?

A lot of Django app deployments over Amazon's EC2 use HTTP servers NGINX and Gunicorn.
I was wondering what they actually do and why both are used in parallel. What is the purpose of running them both in parallel?

They aren't used in parallel. NGINX is a reverse proxy. It's first in line. It accepts incoming connections and decides where they should go next. It also (usually) serves static media such as CSS, JS and images. It can also do other things such as encryption via SSL, caching etc.
Gunicorn is the next layer and is an application server. NGINX sees that the incoming connection is for www.domain.com and knows (via configuration files) that it should pass that connection onto Gunicorn. Gunicorn is a WSGI server which is basically a:
simple and universal interface between web servers and web applications or frameworks
Gunicorn's job is to manage and run the Django instance(s) (similar to using django-admin runserver during development)
The contrast to this setup is to use Apache with the mod_wsgi module. In this situation, the application server is actually a part of Apache, running as a module.

Nginx and Gunicorn are not used in parrallel.
Gunicorn, is a Web Server Gateway Interface (WSGI) server
implementation that is commonly used to run Python web applications.
NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.
Nginx responsible for serving static content, gzip compression, ssl,
proxy_buffers and other HTTP stuff.While gunicorn is a Python HTTP server that interfaces with both nginx and your actual python web-app code to serve dynamic content.
The following diagrams shows how nginx and Gunicorn interact.