Redis Server inside Docker Container with nginx + redis_pass - django

Question

I'm developing a simple Chat application (based on django-private-chat2 ) with django & django-channels. I want the application to be fully Containerized and use nginx for routing inside the container.
So I'm trying to connect through a web-socket to a redis-server running inside a docker container. I've tried many things (see below) but still can't get it to work. It is not unlikely that my general approach is wrong.
EDIT:
As #Zeitounator suggested I've created a mcve illustrating the Problem. It's on my secondary github here it contains all configuration files for a minimal example (Dockerfile, docker-compose.yaml, nginx.conf, redis.conf, supervisord.ini ...) also the folder 'tests' contains two tests illustrating - that it works locally, but not inside container. Tests are to be run inside root directory.
I've added important configs code at the end.
I still believe my nginx configuration might be off, any help appreciated!
Here is what I've got so far.
Redis-Server and websocket connection works outside Docker container.
Inside the docker container I compile and run nginx with the 'HTTP Redis' here
this module is loaded via 'load_module *.so' inside nginx.conf, I've verified that the module is loaded.
I've configured the redis-server inside the Docker-container to use 'bind 0.0.0.0 and protected-mode no'
Inside nginx then I route all the '/' traffic to a django application running on port 8000.
I route all traffic to 'chat_ws/' ( from the web socket ) to 127.0.0.1:6379 the redis-server ( with nginx reverse_proxy ).
I've verified that routing works properly ( return 404 with nginx on chat_ws addresses works )
I can connect to the redis-server through redis-cli on my machine, when I use 'redis-cli -h DOCKER_CONTAINER_IP' so the redis_pass also seems to work.
In the django settings I've specified the CHANNEL_LAYERS and set the redis backend host to 127.0.0.1:6379 ( which again works completely fine outside the Docker container)
But if I open the webpage (through the Docker container) in my Browser everything works except the websocket connection to the redis-server
I'm especially confused that redis-cli connection to the container works fine but not the websocket, Which does work locally ( outside the container ).
( What I've been thinking:
maybe a web-socket connection w. redis_pass throuh nginx is generally problematic?
maybe 'HTTP Redis' version is to old, but how to debug this since I don't see any log output of the module in nginx stdout. )
Any help to debug recommendation is appreciated. Or Ideas for different approaches. Also tell me If I should provide further Information or share specific config files. Thanks in advance!
Dockerfile:
Installs requirements, compiles nginx w. redis_pass, start everything.
FROM nginx:alpine AS builder
ADD ./requirements.txt /app/requirements.txt
RUN apk add --update --no-cache python3 py3-pip && ln -sf python3 /usr/bin/python
RUN set -ex \
&& apk add --no-cache --virtual .build-deps postgresql-dev build-base python3-dev python2-dev libffi-dev \
&& python3 -m venv /env \
&& python3 -m pip install --upgrade pip \
&& python3 -m pip install --no-cache --upgrade pip setuptools \
&& python3 -m ensurepip \
&& python3 -m pip install -r /app/requirements.txt \
&& runDeps="$(scanelf --needed --nobanner --recursive /env \
| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
| sort -u \
| xargs -r apk info --installed \
| sort -u)" \
&& apk add --virtual rundeps $runDeps \
&& apk del .build-deps
RUN apk add --no-cache build-base libressl-dev libffi-dev
# rest of code is mounted to the docker container in docker-compose ( only in dev, for local debugging )
WORKDIR /app
ENV VIRTUAL_ENV /env
ENV PATH /env/bin:$PATH
# Install Supervisord to, start redis-server, gunicorn and nginx simultaniously
RUN apk add --no-cache supervisor
RUN apk add --no-cache redis
# Stuff needed to make custom nginx compilation
RUN apk add --no-cache --virtual .build-deps \
gcc \
libc-dev \
make \
openssl-dev \
pcre-dev \
zlib-dev \
linux-headers \
curl \
gnupg \
libxslt-dev \
gd-dev \
geoip-dev
RUN wget "http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz" -O nginx.tar.gz
# compile with HTTP redis for nginx
RUN wget "https://people.freebsd.org/~osa/ngx_http_redis-0.3.9.tar.gz" -O redis.tar.gz
# Compile ...
RUN mkdir /usr/src && \
CONFARGS=$(nginx -V 2>&1 | sed -n -e 's/^.*arguments: //p') \
tar -zxC /usr/src -f nginx.tar.gz && \
tar -xzvf "redis.tar.gz" && \
REDISDIR="$(pwd)/ngx_http_redis-0.3.9" && \
cd /usr/src/nginx-$NGINX_VERSION && \
./configure --with-compat $CONFARGS --add-dynamic-module=$REDISDIR && \
make && make install
COPY supervisord.ini /etc/supervisor.d/supervisord.ini
COPY ./nginx.conf /etc/nginx/nginx.conf
RUN mkdir /etc/redis
COPY ./redis.conf /etc/redis/redis.conf
EXPOSE 80
# Start all services ( see ./supercisord.ini )
CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor.d/supervisord.ini"]
nginx.conf
daemon off;
user nginx;
worker_processes 1;
pid /var/run/nginx.pid;
load_module /usr/local/nginx/modules/ngx_http_redis_module.so;
events {
worker_connections 1024;
}
http {
access_log /dev/stdout;
upstream asgi {
server 127.0.0.1:8000 fail_timeout=0;
}
server {
listen 80;
server_name localhost;
client_max_body_size 4G;
location /chat_ws {
set $redis_key $uri;
redis_pass 127.0.0.1:6379;
error_page 404 = /fallback;
}
location / {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_pass http://asgi;
}
}
}
redis.conf
bind 0.0.0.0
protected-mode no
docker-compose.yml
version: '3.7'
services:
nginxweb:
image: redis_nginx_docker
restart: always
build:
context: .
dockerfile: ./Dockerfile
ports:
- 8000:80
env_file:
- env
volumes:
- ./mcve:/app
Remaining configuration may be found in the git repo.