nginx "502 Bad Gateway" error

[Terry McKenna]

Hi Guys,

I followed all of the instructions in the install doc and am able to start the dev http server: # ./manage.py runserver 0.0.0.0:800

The page does display, albeit not correctly, so I tried setting up the 'nginx' http server and all I get is a "502 Bad Gateway" message.

Anyone have any ideas why?

The only thing that I would consider different than what the docs call out is that it's a Ubuntu VM and not a member of a domain:

server { listen 80; server_name Ubuntu-16; access_log off; location /static/ { alias /opt/netbox/netbox/static/; } location / { proxy_pass http://127.0.0.1:8001; proxy_set_header X-Forwarded-Host $server_name; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-Proto $scheme; add_header P3P 'CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV"'; } }

configuration.py

ALLOWED_HOSTS = ['Ubuntu-16','192.168.1.14'']

Thanks

[Josh VanDeraa]

I'm new to Netbox myself, and I'm having some troubles with Ubuntu 16.04 and Apache web service myself when I ran across this article:

https://github.com/digitalocean/netbox/issues/137

Seems to be relatively related.

[Jeremy Stretch]

A 502 error indicates that the WSGI service behind nginx is not running. Double-check that your gunicorn config matches the documentation and restart the supervisor service.

If it still doesn't work, try executing gunciorn manually and see what errors it reports (adjust the commands below as necessary to match your installation):

cd /opt/netbox/netbox/
sudo -u www-data gunicorn -c /opt/netbox/gunicorn_config.py netbox.wsgi

Jeremy

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[Terry McKenna]

Thanks Jeremy, I'll check it out.

I want to mention a discrepancy between what I am seeing installing on Ubuntu 16.04.01 and the documentation:

http://netbox.readthedocs.io/en/latest/installation/netbox/

States:

Configuration

Move into the NetBox configuration directory and make a copy of configuration.example.py named  configuration.py.

# cd netbox/netbox/

I cut-&-paste all the commands from the install guide so this can be verified by doing the same, the "configuration.example.py" file is located at:

/opt/netbox/netbox/netbox and not at /opt/netbox/netbox

Is that an issue? I performed this install twice and it's the same both times.

Thanks

[Terry McKenna]

I see what I did wrong here. The previous step is run from /opt/netbox so the instructions to "cd /netbox/netbox/" are correct.

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[Terry McKenna]

So here's how I messed up...

I skipped the entire section in the documentation for installing and configuring both gunicorn and supervisord. I thought those were part of the Apache install. Once I followed the documentation the nginx server works.

One problem, I have to manually run $cd /opt/netbox/netbox/; $sudo -u www-data gunicorn -c /opt/netbox/gunicorn_config.py netbox.wsgi after booting the server. Is that expected? 

Thanks

On Thursday, October 27, 2016 at 7:23:46 PM UTC-4, Terry McKenna wrote:

[Ravi Bhikhie]

Apologies for kicking up an old topic, but I ran into this last night as well.

The documentation does say to install and set up Gunicorn and Supervisor HOWEVER, it doesn't really describe why.

So that's my question: what do both applications do and why does Nginx throw an error 502 when they are not running?

I thought it was possible to set up a website just using Nginx itself?

I'm trying to understand more about how Netbox operates.

Thanks!

[bellwood]

Gunicorn is the WSGI server (it serves the actual Django WSGI)

Supervisor daemonizes gunicorn.

NGINX sits in front, serves the static content and proxies application traffic to and from gunicorn.

[Ravi Bhikhie]

Thanks!

[Sean Scarfo]

Did you ever get this working?  I too am having problems?

[Dustin Peet]

Just wanted to post something that helped me regarding this issue quickly... 

I was getting 502 errors until I made my gunicorn_config file executable.  Makes sense, but the document doesn't seem to detail that specifically

For me (Ubuntu 18.04.2):

sudo chmod 755 /opt/netbox/netbox/gunicorn_config.py

then I kicked the supervisor and nginx services and FINALLY got the web page to load.  Such a feeling of accomplishment (and relief) :)

HTH