Django ALLOWED_HOSTS with ELB HealthCheck
I have a django app deployed on Elastic Beanstalk. HealthCheck is not working for my application because ELB HealthCheck IP is not included in my settings variable ALLOWED_HOSTS
.
How do I change ALLOWED_HOSTS
to pass HealthCheck? I would just pass in an explicit IP, but I believe this changes, so whenever the IP changes change, validation will fail until I add a new IP.
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Your EC2 instance can request metadata about itself, including its IP address, which is available at http://169.254.169.254/latest/meta-data/local-ipv4 .
You can check this by ssh-in into your EC2 instance and running:
curl http://169.254.169.254/latest/meta-data/local-ipv4
So, in your configuration, you can do something like:
import requests
ALLOWED_HOSTS = ['.yourdomain.com', ]
try:
EC2_IP = requests.get('http://169.254.169.254/latest/meta-data/local-ipv4').text
ALLOWED_HOSTS.append(EC2_IP)
except requests.exceptions.RequestException:
pass
Obviously you can replace requests
with urllib
if you don't need the dependency.
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The other solution doesn't answer the question because it doesn't account for all the various AWS tools (ELB, etc.). What we are done with (since we are using nginx
+ uwsgi
), we are setting the header to something valid when the user makes a request.
As described on this page:
https://opbeat.com/blog/posts/the-new-django-allowed_hosts-with-elb-uwsgi-and-nginx/
We'll post our config nginx
as shown below:
set $my_host $host;
if ($host ~ "\d+\.\d+\.\d+\.\d+") {
set $my_host "example.com";
}
location / {
uwsgi_pass unix:///tmp/mysite.com.sock;
uwsgi_param HTTP_HOST $my_host;
include uwsgi_params;
}
The key here is to put a valid value for $my_host
according to yours ALLOWED_HOSTS
.
Unfortunately, there is no “perfect” solution without increasing overhead. In some configurations, you will need to constantly add IPs to ALLOWED_HOSTS
, but this solution usually works with the smallest head.
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