502 Bad Gateway in django app on vps why? - django

Question

I am trying to deploy a Django project but I get 502 Bad Gateway
I used this tutorial
I used supervisor, Gunciorn, and Nginx
./virtualenvs/legaland_env/bin/gunicorn
#!/bin/bash
NAME="django_project"
DIR=/home/django/django_project
USER=django
GROUP=django
WORKERS=3
BIND=unix:/home/django/run/gunicorn.sock
DJANGO_SETTINGS_MODULE=django_project.settings
DJANGO_WSGI_MODULE=django_project.wsgi
LOG_LEVEL=error
cd $DIR
source ../bin/activate
export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS_MODULE
export PYTHONPATH=$DIR:$PYTHONPATH
exec ../bin/gunicorn ${DJANGO_WSGI_MODULE}:application \
--name $NAME \
--workers $WORKERS \
--user=$USER \
--group=$GROUP \
--bind=$BIND \
--log-level=$LOG_LEVEL \
--log-file=-
/etc/supervisor/conf.d/sqh.conf
[program:sqh]
startsecs=0
command=/home/admin/legaland/virtualenvs/legaland_env/bin/gunicorn
user=admin
autostart=true
autorestart=true
redirect_stderr=true
stdout_logfile=/home/admin/legaland/gunicorn-error.log
/etc/nginx/sites-available/sqh
upstream app_server {
server unix:/home/admin/legaland/run/gunicorn.sock fail_timeout=0;
}
server {
listen 80;
# add here the ip address of your server
# or a domain pointing to that ip (like example.com or www.example.com)
server_name ;
keepalive_timeout 5;
client_max_body_size 4G;
access_log /home/admin/legaland/logs/nginx-access.log;
error_log /home/admin/legaland/logs/nginx-error.log;
location /static/ {
alias /home/admin/legaland/Legaland/src/static_root/;
}
# checks for static file, if not found proxy to app
location / {
try_files $uri #proxy_to_app;
}
location #proxy_to_app {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_pass http://app_server;
}
}

Answer 1

Had a similar issue using the hosted platform heroku. I also got 502 bad gateway and the fix was to run the web application locally. You have to specify in the nginx config file these settings such as:
Using TCP/IP Connection:
upstream localhost {
# server unix:/tmp/nginx.socket fail_timeout=0;
server 127.0.0.1:8000
}
location / {
# Uncomment this if statement to force SSL/redirect http -> https
# if ($http_x_forwarded_proto != "https") {
# return 301 https://$host$request_uri;
# }
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host 127.0.0.1:8000;
proxy_redirect off
proxy_pass http://localhost;
}
Then in your gunicorn config file:
command='/myapp/django_env/bin/gunicorn'
pythonpath='/myapp'
bind='localhost'
workers=1
The Procfile:
web: gunicorn -c conf/gunicorn_config.py myproject.wsgi
worker: service nginx start
Last, type the following command in bash to run the heroku app:
heroku local