如何重写某些特定路径的 URL？答案

【问题标题】：How to rewrite URLs for some specific paths?如何重写某些特定路径的 URL？
【发布时间】：2021-08-29 15:29:28
【问题描述】：

我在 ingress-nginx 文档中读到，由于这样的注释，正在执行重写：

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: rewrite
  namespace: default
spec:
  rules:
  - host: rewrite.bar.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /something(/|$)(.*)

我有一个案例，我有多个主机，我希望只为某些特定路径重写 URL：

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
  name: ingress
spec:
  rules:
    - host: somehost.westeurope.cloudapp.azure.com
      http:
        paths:
        - path: /rest-smtp-sink # I want to rewrite this path
          pathType: Prefix
          backend:
            service:
              name: rest-smtp-sink-svc
              port:
                number: 80
        - path: /backend # This one too
          pathType: Prefix
          backend:
            service:
              name: server-svc
              port:
                number: 80
        - path: / # But not this one
          pathType: Prefix
          backend:
            service:
              name: client-svc
              port:
                number: 80

但是，注释似乎是全局的。如何仅对某些路径启用 URL 重写？

【问题讨论】：

标签： kubernetes url-rewriting nginx-ingress

【解决方案1】：

我设法通过这个配置得到了想要的结果：

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: ingress
spec:
  rules:
    - host: somehost.westeurope.cloudapp.azure.com
      http:
        paths:
        - path: /rest-smtp-sink(/|$)(.*)
          pathType: Prefix
          backend:
            service:
              name: rest-smtp-sink-svc
              port:
                number: 80
        - path: /backend(/|$)(.*)
          pathType: Prefix
          backend:
            service:
              name: server-svc
              port:
                number: 80
        - path: /()(.*)
          pathType: Prefix
          backend:
            service:
              name: client-svc
              port:
                number: 80

由于nginx.ingress.kubernetes.io/rewrite-target 注释是全局的，我使用/$2 作为重写目标，/()(.*) 作为根路径的 noop。

【讨论】：