How rewrite target working under the hood?

[BinaryWorld2099]

I was trying the rewrite target in k8s nginx
here is my example:
nginx.ingress.kubernetes.io/rewrite-target: /$2
path is set to ggg

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
name: single-routeggg
namespace: test
spec:
ingressClassName: nginx
rules:

• host: test4.test5.test6.com
  http:
  paths:
  • path: /ggg(/|$)(.*)
    pathType: Exact
    backend:
    service:
    name: ggg-svc
    port:
    number: 80

the service is ExternalName with google.com

apiVersion: v1
kind: Service
metadata:
name: ggg-svc
namespace: test
labels:
app: ggg
spec:
type: ExternalName
externalName: google.com

the rewrite target is working
rewrite path form ggg/1/2/3 to /1/2/3

but checked in Wireshark, the traffic still remain /ggg/1/2/3

What to find out where is the magic trick that change to request to /1/2/3 but not /ggg/1/2/3

[jasonwilliams14]

@BinaryWorld2099 Hello there.
In looking at the information you have provided, it looks like you are using annotations for a different NGINX Ingress controller project.
This is the annotation you are using:

nginx.ingress.kubernetes.io/rewrite-target: 

That is for a different project.
The annotation you will want to use for this project is:

nginx.org/rewrites

Here is the link to our Ingress controller documentation and the annotations available.

https://docs.nginx.com/nginx-ingress-controller/configuration/ingress-resources/advanced-configuration-with-annotations/#request-uriheader-manipulation

Let us know how it goes and if you have any other questions.

[BinaryWorld2099]

Thank you for your time, I am testing in minikube, will try this annotation in future

[jasonwilliams14]

@BinaryWorld2099 you are welcome
Let us know how the test goes and if you need any help. We are happy to help out.