nginx - 如何使用Nginx捕获组将前缀附加到重写规则

Question

我目前正在尝试在kubernetes入口中重写四个路径。

这三个都完成了，但是静态文件路径有些棘手。

我的前端路径是/$1-> /(.*) web-front-cluster-ip-service

我还需要重写所有/img/$1-> /img/(.*) apollo-api-cluster-ip-service

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: servers-ingress-service
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /$1
spec:
  rules:
    - http:
        paths:
          - backend:
              serviceName: apollo-api-cluster-ip-service
              servicePort: 4000
            path: /apollo_api/?(.*)
          - backend:
              serviceName: rest-api-cluster-ip-service
              servicePort: 5000
            path: /rest/?(.*)
          - backend:
              serviceName: web-front-cluster-ip-service
              servicePort: 6000
            path: /?(.*)
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: statics-ingress-service
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /img/$1
spec:
  rules:
    - http:
        paths:
        - backend:
            serviceName: apollo-api-cluster-ip-service
            servicePort: 4000
          path: /img/?$(.*)

我当前的设置如上所示，但由于未知原因，我无法到达第二条路线配置的路线。

所以我想做的是将两条路由组合在一起，并提供前缀以捕获与 /img匹配的组

如果我做

      - backend:
          serviceName: apollo-api-cluster-ip-service
          servicePort: 6000
        path: /?(.*)

当我需要任何不以 apollo-api开头的路由时，它将所有内容路由到 /img
所以我需要下面的东西

      - backend:
          serviceName: apollo-api-cluster-ip-service
          servicePort: 4000
        path: /img?(.*) <- somehow add /img to $(.*) because currently it rewrites `/img/static.png` -> `/static.png` but I need `/img/static.png` -> `/img/static.png`.

任何帮助，将不胜感激。

Answer 1

如Rewrite Target documentation中所述:

!!! attention Starting in Version 0.22.0, ingress definitions usingthe annotation nginx.ingress.kubernetes.io/rewrite-target are notbackwards compatible with previous versions. In Version 0.22.0 andbeyond, any substrings within the request URI that need to be passedto the rewritten path must explicitly be defined in a capture group.

!!! note Captured groups are saved in numbered placeholders, chronologically, in the form $1, $2 ... $n. These placeholders can beused as parameters in the rewrite-target annotation.

因此，我想您的第二次入侵应如下所示:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: statics-ingress-service
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /img/$2
spec:
  rules:
    - http:
        paths:
        - backend:
            serviceName: apollo-api-cluster-ip-service
            servicePort: 4000
          path: /img(/|$)(.*)

在这种情况下， $2将反射(reflect) (.*)