Kubernetes Nginx Ingress rewrite-target重写规则未按预期生效求助

问题根因 #

你遇到的捕获组失效问题由两个配置缺失导致：

1. 未开启Ingress Nginx的正则路径匹配开关，path字段内的正则规则未被识别，捕获组为空
2. 使用了Prefix类型的pathType，该类型为Kubernetes原生前缀匹配逻辑，不会将正则捕获组传递给rewrite规则

修复方案 #

修改Ingress配置如下：

kind: Ingress
metadata:
  name: ingress-resource
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /$2
    nginx.ingress.kubernetes.io/enable-rewrite-log: "true"
    # 新增：开启正则路径匹配
    nginx.ingress.kubernetes.io/use-regex: "true"
spec:
  rules:
    - host: "test.gamedrive.cc"
      http:
        paths:
          - path: /player-gateway(/|$)(.*)
            # 修改：将pathType改为ImplementationSpecific，交由Ingress Nginx处理正则
            pathType: ImplementationSpecific
            backend:
              service:
                name: player-gateway
                port:
                  number: 80

修改后重新apply配置即可生效，此时请求/player-gateway/health/startup会被正确重写为/health/startup返回200。

内容的提问来源于stack exchange，提问作者Tkaewkunha