Alauda Container Platform

URL Rewrite

TOC

Basic Concepts

ALB can rewrite the request URL before forwarding it to the backend. You can use regex capture groups to rewrite the URL.

Configuration

via ingress annotation

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: demo
spec:
  ingressClassName: alb
  rules:
    - http:
        paths:
          - backend:
              service:
                name: frontend
                port:
                  number: 8080
            path: /(prefix-x)(/|$)(.*)
            pathType: ImplementationSpecific

via rule

apiVersion: crd.alauda.io/v1
kind: Rule
metadata:
  labels:
    alb2.cpaas.io/frontend: alb-00080
    alb2.cpaas.io/name: alb
  name: demo
  namespace: cpaas-system
spec:
  dslx:
    - type: URL
      values:
        - - REGEX
          - ^/(prefix-x)(/|$)(.*)
  rewrite_base: /(prefix-x)(/|$)(.*)
  rewrite_target: /$3

Example: client requests /prefix-x/abc; backend receives /abc.