CODEWITHSUNDEEP
kuberneteskubernetes-ingressnginx-ingress
ImranRazaKhan
ImranRazaKhan

Reputation: 2297

Rewrite URL in Kubernetes with Ingress

I am migrating legacy websites to Kubernetes, which were working on URLs like www.app1.com, www.app2.com,.

As all are getting deployed in one K8s cluster so I want to use URLs like www.myapp.com/app1 and so on. But when I access www.myapp.com/app1 it routes to www.myapp.com/login rather than www.myapp.com/app1/login

Try1:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$1
  name: rewrite
spec:
  rules:
  - host: www.myapp.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /app1/?(.*)

I tried path: /app1(.*) but it always routes this way:

Try2:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
    nginx.ingress.kubernetes.io/configuration-snippet: rewrite ^(/app1)$ $1/ permanent;
  name: rewrite
spec:
  rules:
  - host: www.myapp.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /app1(/|$)(.*)

This lands me to the login page but all URLs on the page still have URLs like www.myapp.com/page1 or www.myapp.com/page2 rather than www.myapp.com/app1/page1 or www.myapp.com/app1/page2.

It looks like I have to do something in my app, but can't we do something within ingress without changes in the app code?

Update1: ingress logs: In browser when i access www.myapp.com/app1 it prints following logs

[13/Aug/2020:21:19:25 +0000] "GET /app1 HTTP/2.0" 303 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36" 503 0.005 [my-ns-http-svc-80] [] x.x.x.x:80 5 0.005 303 d5da4ff09ee26c83fe67519c98f5eb50

and in browser it gives 404 error and in URL-bar URL is www.myapp.com/login

Upvotes: 1

Views: 6710

Answers (1)

Rico
Rico

Reputation: 61699

Looks like the following redirect is happening in your app:

www.myapp.com/app1 āž”ļø www.myapp.com/app1/login

So if you'd like the same behavior in the Ingress resource you will have to remove the nginx.ingress.kubernetes.io/rewrite-target: annotation.

Then on your paths, you can have something like this:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: rewrite
spec:
  rules:
  - host: www.myapp.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /app1 šŸ‘ˆ Handles the initial request
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /app1/.* šŸ‘ˆ Handles the redirect your app is doing.

āœŒļø

Upvotes: 1

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