nginx + gunicorn 502 bad gateway

Question

I'm trying to deploy a django project on VPS server via nginx and gunicorn, but I got an nginx error '502 bad gateway' when I try to open my page rollservice-rostov.ru

Something is wrong with my Nginx configuration, but I can't figure out what it is.

/etc/nginx/sites-enabled/rollservice.conf:

upstream rollservice-rostov.ru {
    server 127.0.0.1:8010 fail_timeout=0;
}

server {
    listen 80;
    server_name  www.rollservice-rostov.ru;
    rewrite ^/(.*) http://rollservice-rostov.ru/$1 permanent;
    client_max_body_size 4G;
    access_log /home/django/logs/rollservice/nginx.access.log;
    error_log /home/django/logs/rollservice/nginx.error.log;

    location /static/ {
        alias   /home/django/projects/rollservice/static/;
    }

    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_redirect off;

        if (!-f $request_filename) {
            proxy_pass http://rollservice-rostov.ru;
            break;
        }
    }

    error_page 500 502 503 504 /500.html;
    location = /500.html {
        root /home/django/projects/rollservice/templates/;
    }
}

/etc/supervisor/conf.d/rollservice.conf:

[program:rollservice]
command=/home/django/projects/rollservice/run/run.sh
directory=/home/django/projects/rollservice
user=django
autostart=true
autorestart=true
stderr_logfile=/home/django/logs/rollservice/gunicorn_errors.log
stdout_logfile=/home/django/logs/rollservice/gunicorn_access.log

/home/django/projects/rollservice/run/run.sh:

#!/bin/bash

NAME="rollservice"
SRCDIR=rollservice
HOMEDIR=/home/django

PROJECTDIR=${HOMEDIR}/projects/${NAME}
VIRTUALENV=${HOMEDIR}/.envs/${NAME}
SOCKFILE=${HOMEDIR}/tmp/${NAME}.sock

USER=django
GROUP=django
NUM_WORKERS=3
DJANGO_SETTINGS=rollservice.settings
DJANGO_WSGI_MODULE=rollservice.wsgi

echo "Starting $NAME as `whoami`"

# Activate the virtual environment
cd $PROJECTDIR
source ${VIRTUALENV}/bin/activate
export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS
export PYTHONPATH=$PROJECTDIR:$PYTHONPATH

# Create the run directory if it doesn't exist
RUNDIR=$(dirname $SOCKFILE)
test -d $RUNDIR || mkdir -p $RUNDIR

# Start your Django Unicorn
# Programs meant to be run under supervisor should not daemonize themselves (do not use --daemon)
exec ${VIRTUALENV}/bin/gunicorn ${DJANGO_WSGI_MODULE}:application \
  --name $NAME \
  --workers $NUM_WORKERS \
  --user=$USER --group=$GROUP \
  --bind=127.0.0.1:8010 \
  --log-level=debug \
  --log-file=$HOMEDIR/logs/

Although, my page opens successfully via

lynx http://127.0.0.1:8010

This is last error logs:

 rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:18:34 [error] 11425#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 185.20.226.216, server: rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:29:02 [error] 11423#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 67.148.203.206, server: rollservice-rostov.ru, request: "GET /ccs.php?input HTTP/1.0", upstream: "http://185.20.226.216:81/ccs.php?input", host: "rollservice-rostov.ru"
2014/10/12 23:29:02 [error] 11423#0: *5 connect() failed (111: Connection refused) while connecting to upstream, client: 67.148.203.206, server: rollservice-rostov.ru, request: "GET /modules/404.php HTTP/1.0", upstream: "http://185.20.226.216:81/modules/404.php", host: "rollservice-rostov.ru"
2014/10/12 23:33:10 [error] 11905#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 185.20.226.216, server: rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:33:12 [error] 11905#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 141.105.68.10, server: rollservice-rostov.ru, request: "GET /ccs.php?input HTTP/1.0", upstream: "http://185.20.226.216:81/ccs.php?input", host: "rollservice-rostov.ru"
[vps]rollservice> sudo tail /var/log/nginx/error.log
2014/10/12 23:13:27 [error] 11106#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 185.20.226.216, server: rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:16:46 [error] 11295#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 185.20.226.216, server: rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:18:34 [error] 11425#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 185.20.226.216, server: rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:29:02 [error] 11423#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 67.148.203.206, server: rollservice-rostov.ru, request: "GET /ccs.php?input HTTP/1.0", upstream: "http://185.20.226.216:81/ccs.php?input", host: "rollservice-rostov.ru"
2014/10/12 23:29:02 [error] 11423#0: *5 connect() failed (111: Connection refused) while connecting to upstream, client: 67.148.203.206, server: rollservice-rostov.ru, request: "GET /modules/404.php HTTP/1.0", upstream: "http://185.20.226.216:81/modules/404.php", host: "rollservice-rostov.ru"
2014/10/12 23:33:10 [error] 11905#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 185.20.226.216, server: rollservice-rostov.ru, request: "GET / HTTP/1.0", upstream: "http://185.20.226.216:81/", host: "rollservice-rostov.ru"
2014/10/12 23:33:12 [error] 11905#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 141.105.68.10, server: rollservice-rostov.ru, request: "GET /ccs.php?input HTTP/1.0", upstream: "http://185.20.226.216:81/ccs.php?input", host: "rollservice-rostov.ru"
2014/10/12 23:35:22 [error] 11905#0: *5 connect() failed (111: Connection refused) while connecting to upstream, client: 93.72.37.129, server: rollservice-rostov.ru, request: "GET / HTTP/1.1", upstream: "http://185.20.226.216:81/", host: "185.20.226.216"
2014/10/12 23:35:22 [error] 11905#0: *7 connect() failed (111: Connection refused) while connecting to upstream, client: 93.72.37.129, server: rollservice-rostov.ru, request: "GET /favicon.ico HTTP/1.1", upstream: "http://185.20.226.216:81/favicon.ico", host: "185.20.226.216"
2014/10/12 23:35:22 [error] 11905#0: *9 connect() failed (111: Connection refused) while connecting to upstream, client: 93.72.37.129, server: rollservice-rostov.ru, request: "GET /favicon.ico HTTP/1.1", upstream: "http://185.20.226.216:81/favicon.ico", host: "185.20.226.216"

Answer 1

i think it's Django configuration related: if you have set DEBUG to False , ALLOWED_HOSTS is used

To allow any domain name

ALLOWED_HOSTS = ['*',]

To allow only your domain name

ALLOWED_HOSTS = ['rollservice-rostov.ru',]

Config file settings.py may look :

...
DEBUG = False
ALLOWED_HOSTS = ['rollservice-rostov.ru',]
...

To include subdomains , add "." at start

ALLOWED_HOSTS = ['.rollservice-rostov.ru',]

Also , in Django 1.7 and more

ALLOWED_HOSTS = [
   '.rollservice-rostov.ru',  # Allow domain and subdomains
   '.rollservice-rostov.ru.',  # Also allow FQDN and subdomains
]

Check Django docs https://docs.djangoproject.com/en/dev/ref/settings/#allowed-hosts

Answer 2

The problem looks to be with the proxy_pass is passing to a FQDN due to the naming of your up stream.

if (!-f $request_filename) {
    proxy_pass http://rollservice-rostov.ru;
    break;
}

It is passing it straight to that. Change the name of the upstream and you should be okay.

Joe