Traefik 2.2.1路径匹配失效 带/service前缀请求无法路由到指定后端

问题根因 #

你的配置存在两处核心错误：

• 路径匹配规则使用错误：Path(/service)属于精确匹配，仅能匹配路径完全等于/service的请求，无法匹配/service/xxx这类带子路径的请求
• 路由优先级缺失：Traefik路由默认按规则长度自动计算优先级，兜底的Host规则如果先命中，会直接转发到前端服务，导致/service前缀的规则不生效

修正后配置 #

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  creationTimestamp: '2021-09-26T09:10:02Z'
  generation: 4
  name: uat-zhuolian-manage-route
  namespace: dabai-uat
  resourceVersion: '106700291'
  selfLink: >-
    /apis/traefik.containo.us/v1alpha1/namespaces/dabai-uat/ingressroutes/uat-zhuolian-manage-route
  uid: d0b82fab-cd6a-49f0-96dc-f6c0f381bcc5
spec:
  entryPoints:
    - web
  routes:
    # /service前缀路由规则，优先级更高
    - kind: Rule
      match: Host(`zhuolian-pro-manage.example.com`) && PathPrefix(`/service`)
      priority: 100
      services:
        - name: soa-zhuolian-service
          port: 11032
      # 可选：如果后端服务接口本身不带/service前缀，打开下面的中间件配置，去掉前缀再转发
      # middlewares:
      #   - name: strip-service-prefix
    # 默认兜底路由
    - kind: Rule
      match: Host(`zhuolian-pro-manage.example.com`)
      priority: 10
      services:
        - name: be-zhuolian-frontend
          port: 80

可选：去掉/service前缀的中间件配置 #

如果你的soa-zhuolian-service服务的接口路径不包含/service前缀，需要额外部署以下Middleware资源：

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: strip-service-prefix
  namespace: dabai-uat
spec:
  stripPrefix:
    prefixes:
      - /service

改动说明 #

• 将Path(/service)替换为PathPrefix(/service)：匹配所有以/service开头的路径，覆盖你的测试请求场景
• 显式配置priority参数：数值越大优先级越高，确保更精确的/service规则优先于兜底的Host规则触发
• 按需添加StripPrefix中间件：避免后端收到带额外/service前缀的请求导致404

内容的提问来源于stack exchange，提问作者Dolphin