Kubernetes Ingress path not finding resources - apache

Question

I'm having some issues when using a path to point to a different
Kubernetes service.
I'm pointing to a secondary service using the path /secondary-app and I can see through my logs that I am correctly reaching that service.
My issue is that any included resource on the site, let's say /css/main.css for example, end up not found resulting in a 404.
Here's a slimmed down version of my ingress:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: nginx
kubernetes.io/tls-acme: "true"
nginx.ingress.kubernetes.io/proxy-body-size: 50m
nginx.ingress.kubernetes.io/rewrite-target: /
name: my-app
spec:
rules:
- host: my-app.example.com
http:
paths:
- backend:
path: /
serviceName: my-app
servicePort: http
- backend:
path: /secondary-app
serviceName: secondary-app
servicePort: http
I've tried a few things and haven't yet been able to make it work. Do I maybe need to do some apache rewrites?
Any help would be appreciated.
Edit - Solution
Thanks to some help from #mk_sta I was able to get my secondary service application working by using the nginx.ingress.kubernetes.io/configuration-snippet annotation like so:
nginx.ingress.kubernetes.io/configuration-snippet: |
if ($request_uri = '/?%secondary-app') { rewrite /(.*) secondary-app/$1 break; }
It still needs a bit of tweaking for my specific app but that worked exactly how I needed it to.

Answer 1

I guess nginx.ingress.kubernetes.io/rewrite-target: / annotation in your Ingress configuration doesn't bring any success for multipath rewrite target paths, read more here. However, you can consider to use Nginx Plus Ingress controller, shipped with nginx.org/rewrites: annotation and can be used for pointing URI paths to multiple services as described in this example.
You can also think about using nginx.ingress.kubernetes.io/configuration-snippet annotation for the existing Ingress, which can adjust rewrite rules to Nginx location, something like:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: nginx
kubernetes.io/tls-acme: "true"
nginx.ingress.kubernetes.io/proxy-body-size: 50m
nginx.ingress.kubernetes.io/configuration-snippet: |
rewrite /first-app/(.*) $1 break;
rewrite /secondary-app/(.*) /$1 break;
name: my-app
spec:
rules:
- host: my-app.example.com
http:
paths:
- backend:
path: /first-app
serviceName: my-app
servicePort: http
- backend:
path: /secondary-app
serviceName: secondary-app
servicePort: http