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After adding my domain to ALLOWED_HOSTS in django settings I am still getting a 502 error. Not sure why my settings are not recognized.

Posted October 12, 2017 14.2k views
NginxDjangoConfiguration ManagementUbuntu 16.04

So, I created an Ubuntu droplet with nginx, gunicorn and django. I added my domain and when trying to access my django site I got a 502 error. I read in several places that adding my domain to ALLOWEDHOSTS should remedy the problem so I did that and still got the error. To make a long story that should have been shorter shorter I finally started gunicorn in the console and the stacktrace I am getting indicates that my domain probably needs to be added to ALLOWEDHOSTS but I already added it. After digging a little further I notice that there are three files that contain an ALLOWEDHOSTS variable. There is ./var/lib/digitalocean/settings.py, ./var/lib/digitalocean/allowhosts.py and /home/django/djangoproject/djangoproject/settings.py. So far I have attempted adding my domain into each of thes files and still recieve the same error. This is a stupid, really really frustrating error. Anyone have any suggestions or have the same issue?

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bschreiber
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bschreiber
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  • bschreiber October 12, 2017
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    Nevermind, I had debug set to true in settings. I changed that now I am getting a 400 error I believe from nginx and it doesn’t look like like I am not getting to gunicorn at all at this point.

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4 answers
bschreiber October 12, 2017

I figured out what the problem was. I didn’t realize that at the bottom of my settings.py file ALLOWED_HOSTS was being overwritten when the IP addresses are looked up at runtime. Sooo, ALLOWED_HOSTS appears near the beginning of the file which contains the list of your supplied ip addresses and/or domain names and another one at the very end of the file which is set as follows:

Find out what the IP addresses are at run time

This is necessary because otherwise Gunicorn will reject the connections

def ipaddresses():
iplist = []
for interface in netifaces.interfaces():
addrs = netifaces.ifaddresses(interface)
for x in (netifaces.AF_INET, netifaces.AFINET6):
if x in addrs:
iplist.append(addrs[x][0][‘addr’])
return ip_list

Discover our IP address

ALLOWED_HOSTS = ip_addresses()

I had to change ALLOWED_HOSTS = ip_addresses() to ALLOWED_HOSTS += ip_addresses() so that my entries near the beginning of the file weren’t overwritten.

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theblindguidedog August 10, 2019

Doesn’t work for me for some reason.

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jd603 October 13, 2019

Hi, there, I am having the same problem I believe. But I am very new here. Would you please elaborate on your solution, please? Thank you!

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bschreiber October 16, 2019

So, django has a settings.py file that it uses for application-wide configuration. In the settings file generated for my app I was setting the ALLOWED_HOSTS variable but then at the end of the file it was being overwritten. The following line at the end of the settings file:

ALLOWEDHOSTS += ipaddresses()

“appends” the output from the ipaddresses call to what I set ALLOWEDHOSTS to previously in the file.

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