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如何获取已在前端部分提供请求服务的服务器的名称？

tag-icon • tag-icon load-balancing haproxy
如何获取已在前端部分提供请求服务的服务器的名称？

我需要在响应 HTTP 标头 X-Servedby 中添加服务器名称。有没有办法将 [server] 替换为已处理请求的服务器名称？

frontend front x.x.x.x:80
  default_backend balancing
  rspadd X-Servedby:\ [server] #I need to replace [server]

backend balancing
  server srv1 x.x.x.x:80 check
  server srv2 x.x.x.x:80 check

答案1

为了实现这一点，请将该frontend节更改为以下内容：

frontend front x.x.x.x:80
    default_backend balancing
    acl srv1 srv_id 1
    acl srv2 srv_id 2
    rspadd X-Servedby:\ srv1 if srv1
    rspadd X-Servedby:\ srv2 if srv2

然而，更好的扩展替代方案是在节cookie中使用backend：

backend balancing
    cookie SRVNAME insert
    server srv1 x.x.x.x:80 cookie srv1 check
    server srv2 x.x.x.x:80 cookie srv2 check

希望这可以帮助！

答案2

我们应该使用srv_id为其定义id的值server

frontend front x.x.x.x:80

  acl serve_us1 url_beg /west
  acl serve_us2 url_beg /east

  #defining acl for srv_id
  acl served_by_us1 srv_id 1  #look at srv_id
  acl served_by_us2 srv_id 2  #look at srv_id

  use_backend us1 if serve_us1
  use_backend us2 if serve_us2 
  default_backend balancing

  rspadd X-ServedBy:\ us1 if served_by_us1
  rspadd X-ServedBy:\ us2 if served_by_us2

backend us1
  server srv1 1.1.1.1:80 check id 1 #look at id

backend us2
  server srv2 2.2.2.2:80 check id 2 #look at id

backend balancing
  server srv1 1.1.1.1:80 check id 1 #look at id
  server srv2 2.2.2.2:80 check id 2 #look at id

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