How to redirect to multiple servers sitting behind HAProxy which have different path begining

Question

I have 3 servers which listen on following port ,

> 10.21.5.39:80    -->   api.something.com
> 10.21.4.234:80    -->   *.something.com
> 10.21.5.73:80     -->   coolapi.something.com
> 10.21.5.73:3002    -->   school.something.com

I am using a HAProxy server to redirect the traffic to these backends, i am using the following config on haproxy which doesn't seem to workout.

frontend api
       bind *:80
       acl url_api path_beg /api
       use_backend api-backend if url_api

frontend custui
       bind *:80
       acl url_custui path_beg *
       use_backend custui-backend if url_custui


frontend backoffice
       bind *:80
       acl url_backoffice path_beg /backoffice
       use_backend backoff-backend if url_backoffice

frontend partnerui
       bind *:80
       acl url_partnerui path_beg /partner
       use_backend partner-backend if url_partnerui


backend api-backend
    mode    http
    option  httpchk
    server  api01 10.21.5.39:80

backend custui-backend
    mode    http
    option  httpchk
    server  custui01 10.21.4.234:80

backend backoff-backend
    mode http
    option httpchk
    server backoff01 10.21.5.73:80


backend partner-backend
    mode http
    option httpchk
    server backoff01 10.21.5.73:3002

所以这个想法是让HAProxy监听80，然后重定向到监听指定端口的后端..请帮忙

Answer 1

几个问题：

• 您frontends在端口 80 上有多个监听；我建议使用单个前端并使用 ACL 将流量定向到您的backends. 从HAProxy 文档：

  可以有任意多的“use_backend”规则。所有这些规则都按照它们的声明顺序进行评估，第一个匹配的将分配后端。

• 您提供option httpchk，但不支持您的server线路上的支票；来自 HAProxy 文档（特别是 1.5.18，但与其他版本相当）

  端口和间隔在服务器配置中指定。

  我建议添加一个间隔（以毫秒为单位），例如

  server  custui01 10.21.4.234:80 check inter 2000
  

• 您正在每个后端指定mode http和option httpchk；这些可以在该defaults部分中组合，然后在必要时在后端覆盖。

• 我喜欢hdr(host)用来检查 HTTP 请求的 URL，所以我会重写acl url_api path_beg /api为acl url_api hdr(host) -m beg api.，但这取决于个人喜好

将这些建议与您列出的要求相结合，这是您的配置文件的更新版本：

defaults
   mode    http
   option  httpchk

frontend something.com
   bind *:80

   acl url_api path_beg /api
   use_backend api-backend if url_api

   acl url_backoffice path_beg /backoffice
   use_backend backoff-backend if url_backoffice

   acl url_partnerui path_beg /partner
   use_backend partner-backend if url_partnerui

   # Catches anything not covered by use_backend above
   default_backend custui-backend

backend api-backend
    server  api01    10.21.5.39:80   check inter 2000

backend backoff-backend
    server backoff01 10.21.5.73:80   check inter 2000

backend partner-backend
    server backoff01 10.21.5.73:3002 check inter 2000

backend custui-backend
    server  custui01 10.21.4.234:80  check inter 2000