Question

Flask install 502 Bad Gateway nginx

I am beginner in python development and I first time tried to upload to server DigitalOcean. I followed this tutorial link. But I have a problem when I finished tutorial 502 Bad Gateway nginx/1.10.0 (Ubuntu)

Zlty.ini

[uwsgi]
module = wsgi:app

master = true

socket = zlty.sock
chmod-socket = 660
vacuum = true

die-on-term = true

Zlty.service

[Unit]
Description=uWSGI instance to serve zlty
After=network.target

[Service]
User=dendis
Group=www-data
WorkingDirectory=/home/dendis/zlty
Environment="PATH=/home/dendis/zlty/zltyenv/bin"
ExecStart=/home/dendis/zlty/zltyenv/bin/uwsgi --ini zlty.ini

[Install]
WantedBy=multi-user.target

sites-available

server {
    listen 80;
    server_name 139.59.145.129;

    location / {
        include uwsgi_params;
        uwsgi_pass unix:/home/dendis/zlty/zlty.sock;
    }
}

Log in nginx 2016/07/26 03:53:02 [crit] 9563#9563: *9 connect() to unix:/home/dendis/zlty/zlty.sock failed (2: No such file or directory) while connecting to upstream, client: 188.123.100.136, server: 139.59.145.129, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/home/dendis/zlty/zlty.sock:", host: "139.59.145.129"

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Replace

   ``` uwsgi_pass unix:/home/jrm2k6/jeremydagorn-blog/jeremydagorn.sock;```

with

   ```uwsgi_pass unix:///home/jrm2k6/jeremydagorn-blog/jeremydagorn.sock;```

and restart Nginx. It might help you.

OR refer - https://www.digitalocean.com/community/questions/how-to-fix-502-bad-gateway-error-with-nginx-uwsgi-for-flask-app

When following this tutorial did you complete the section on creating and testing a sample application. This section included temporarily opening port 5000 and ensuring the app is returned. It sounds like the flask application itself is not responding when it is requested by nginx upstream so working from the bottom of the stack should be the best way to identify the issue.