".sock" does not exist error; connect() error - django

Question

I'm trying to set up my Mezzanine/Django project on a virtual Ubuntu 14.04 box on Linode, but get a "502 Bad Gateway error" when trying to navigate to my site in my browser.
I'm following the instructions here: https://linode.com/docs/web-servers/nginx/deploy-django-applications-using-uwsgi-and-nginx-on-ubuntu-14-04.
I ran git clone in /home/django/, so everything's in a folder named FOLDER.
/home/django/ has these directories: Env/ and FOLDER/.
This should give some idea of what FOLDER/ tree looks like:
FOLDER
- product_blog
-- product_blog
--- settings.py
--- wsgi.py
-- manage.py
In my settings.py, I have:
ALLOWED_HOSTS = ["PUBLIC IP OF MY LINODE UBUNTU INSTANCE HERE"]
wsgi.py has this:
"""
WSGI config for product_blog project.
It exposes the WSGI callable as a module-level variable named ``application``.
For more information on this file, see
https://docs.djangoproject.com/en/1.10/howto/deployment/wsgi/
"""
import os
from django.core.wsgi import get_wsgi_application
from mezzanine.utils.conf import real_project_name
os.environ.setdefault("DJANGO_SETTINGS_MODULE",
"%s.settings" % real_project_name("product_blog"))
application = get_wsgi_application()
/etc/uwsgi/sites/product_blog.ini has this:
[uwsgi]
project = product_blog
base = /home/django
chdir = %(base)/%(project)
home = %(base)/Env/%(project)
module = %(project).wsgi:application
master = true
processes = 2
socket = %(base)/%(project)/%(project).sock
chmod-socket = 664
vacuum = true
/etc/init/uwsgi.conf has this:
description "uWSGI"
start on runlevel [2345]
stop on runlevel [06]
respawn
env UWSGI=/usr/local/bin/uwsgi
env LOGTO=/var/log/uwsgi.log
exec $UWSGI --master --emperor /etc/uwsgi/sites --die-on-term --uid django --gid www-data --logto $LOGTO
/etc/nginx/sites-available/product_blog has this:
server {
listen 80;
server_name mydomain.com;
location = /favicon.ico { access_log off; log_not_found off; }
location /static/ {
root /home/django/FOLDER;
}
location / {
include uwsgi_params;
uwsgi_pass unix:/home/django/FOLDER/product_blog/product_blog.sock;
}
}
When I go to the IP address for the Linode box, I see a 502 Bad Gateway error.
/var/log/uwsgi.log has this...
*** has_emperor mode detected (fd: 6) ***
[uWSGI] getting INI configuration from product_blog.ini
*** Starting uWSGI 2.0.17 (64bit) on [Sun Apr 22 17:17:56 2018] ***
compiled with version: 4.8.4 on 22 April 2018 19:53:45
os: Linux-4.15.12-x86_64-linode105 #1 SMP Thu Mar 22 02:13:40 UTC 2018
nodename: ubuntu-linode
machine: x86_64
clock source: unix
detected number of CPU cores: 1
current working directory: /etc/uwsgi/sites
detected binary path: /usr/local/bin/uwsgi
!!! no internal routing support, rebuild with pcre support !!!
chdir() to /home/django/product_blog
chdir(): No such file or directory [core/uwsgi.c line 2629]
chdir(): No such file or directory [core/uwsgi.c line 1644]
Sun Apr 22 17:17:56 2018 - [emperor] curse the uwsgi instance product_blog.ini (pid: 4238)
Sun Apr 22 17:17:59 2018 - [emperor] removed uwsgi instance product_blog.ini
And /var/log/nginx/error.log has this (identifying info removed):
2018/04/22 17:18:14 [crit] 3953#0: *9 connect() to unix:/home/django/FOLDER/product_blog/product_blog.sock failed (2: No such file or directory) while connecting to upstream, client: 73.49.35.42, server: mydomain.com, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/home/django/FOLDER/product_blog/product_blog.sock:", host: "ADDRESS TO LINODE BOX"
It seems that product_blog.sock is supposed to be somewhere in my directory, but it is not there. How do I fix the 502 error so that I can navigate my browser to the Linode box's address and see a working website?

Answer 1

The socket file is supposed to be created by uWSGI. But the uWSGI log is telling you that it can't start up because it can't cd to the directory you have specified in product_blog.ini, /home/django/product_blog.
I can't tell if FOLDER is a placeholder or not, but in any case you don't seem to have included it in that path. I suppose it should be:
chdir = %(base)/FOLDER/%(project)
...
socket = %(base)/FOLDER/%(project)/%(project).sock