Hosting django on aks behind nginx-ingress - django

Question

I am trying to host a django website on Azure kubernetes service behide nginx-ingress, and I would like my django web show under a path.
e.g. when access the default admin site, I would like to access it at http://example.com/django/admin instead of http://example.com/admin
I tried the configure below, when I access http://example.com/django/admin it will forward me to http://example.com/admin and show me 404 error from default ingress backend, as I set django debug to ture I assume this mean ingress did not send my request to my django service
# path example
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: django-ingress
labels:
app: django
namespace: default
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
rules:
- http:
paths:
- backend:
serviceName: django-service
servicePort: 80
path: /django(/|$)(.*)
so I try to curl -I -k http://example.com/django/admin, and it show something like below
HTTP/1.1 301 Moved Permanently
Server: openresty/1.15.8.2
Date: Wed, 06 Nov 2019 04:14:14 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 0
Connection: keep-alive
Location: /admin/
The same thing happen to any valid page in the site, if I curl -I -k http://example.com/django/any_valid_page it show below:
HTTP/1.1 301 Moved Permanently
Server: openresty/1.15.8.2
Date: Wed, 06 Nov 2019 04:14:14 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 0
Connection: keep-alive
Location: /any_valid_page/
I wonder it is caused by I am doing the test with the default django development web server? (i.e. python manage.py runserver)
If I try to host it at root like below, everything is fine...
# root example
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: django-ingress
labels:
app: django
namespace: default
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/ssl-redirect: "false"
spec:
rules:
- http:
paths:
- backend:
serviceName: django-service
servicePort: 80
path: /

Answer 1

Trying adding this
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: django-ingress
labels:
app: django
namespace: default
annotations:
kubernetes.io/ingress.class: nginx
ingress.kubernetes.io/rewrite-target: /django
nginx.ingress.kubernetes.io/ssl-redirect: "false"
spec:
rules:
- http:
paths:
- backend:
serviceName: django-service
servicePort: 80
path: /django

Answer 2

Starting in Version 0.22.0, ingress definitions using the annotation
nginx.ingress.kubernetes.io/rewrite-target are not backwards
compatible with previous versions. In Version 0.22.0 and beyond, any
substrings within the request URI that need to be passed to the
rewritten path must explicitly be defined in a capture group. So make
sure you have right version.
When using SSL offloading outside of cluster it may be useful to enforce a redirect to HTTPS even when there is no TLS certificate available. This can be achieved by using the nginx.ingress.kubernetes.io/force-ssl-redirect: "true" annotation in the particular resource.
I think your Ingress configuration file should look like this:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: django-ingress
labels:
app: django
namespace: default
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/force-ssl-redirect: "false"
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
rules:
- host: example.com
http:
paths:
- path: /django(/|$)(.*)
backend:
serviceName: django-service
servicePort: 80
If you get 404 error, there is possible solution:
Please change https to http in the curl command?:
curl --resolve your-host:80:xx.xxx.xx.xxx http://my-host:80
To get the IP from kubectl get ing command, it is necessary to
enable the reporting Ingress status feature. Take a look on: reporting-ingress-status.
There is the default server in the Ingress controller. It returns
the Not Found page with the 404 status code for all requests for
domains for which there are no Ingress rules defined. Those requests
are not shown in the access log.
Since you're getting a 404, this means that the host header of your
requests doesn't match with the host field in the Ingress resource.
To set the host header in curl, please see previous curl
commands. Optionally, you can also do:
curl http://<ip> -H "host: example.com"
Please take a look on ngnix-ingress, server-side-https-enforcement-nginx.

Answer 3

This is a problem from Django's side. Whenever the admin is not logged in, the /django/admin results in a redirect to /admin/. In this case, if you just replace /django/admin/ with /django/admin/ in the browser URL field it will work and open django admin login.
So basically Django's built-in redirect conflicts with the Ingress's rewrite module.