iRULE to troubleshoot cookie

Question

The application required stickness so we configured cookie presistance , sometimes its throwing 500 error page but its working perfectly with source_address presistance 
so we need to troubleshhot the cookie whether its keeping stickness .I want to log the floowing to troubleshoot , please help to correct me if its correct logic and syntax&nbsp;
1)log the client ip address and X-Forwarded-for
2)log whether request has  "LB_PRODREG_PRD" cookie exist or not
3)log the request sent to which LB server
4log the resonse code  and throw if the its has 500 error&nbsp;

velumanidevf5_2 · Answer

when CLIENT_ACCEPTED {&nbsp;
     log local0. "[IP::client_addr]:[TCP::client_port]: New TCP connection to [IP::local_addr]:[TCP::local_port]" 
     log local0. "X-Forwarded-For: [HTTP::header X-Forwarded-For]" 
  }&nbsp;
  when HTTP_REQUEST {&nbsp;
           set hostvar [HTTP::host] 
           set urivar [HTTP::uri] 
           set ipvar [IP::client_addr]
     if {[HTTP::cookie exists "LB_PRODREG_PRD"]}{&nbsp;
        log local0. "[IP::client_addr]:[TCP::client_port]:  Request with persistence cookie [HTTP::cookie value "LB_PRODREG_PRD"] to [HTTP::host][HTTP::uri]"&nbsp;
     } else {&nbsp;
        log local0. "[IP::client_addr]:[TCP::client_port]:  Request contains NO persistence cookie to [HTTP::host][HTTP::uri]" 
     }&nbsp;
  }&nbsp;
  when LB_SELECTED {&nbsp;
     log local0. "[IP::client_addr]:[TCP::client_port]: Request sent to [LB::server]"&nbsp;
  }&nbsp;
  when LB_FAILED {&nbsp;
     log local0. "[IP::client_addr]:[TCP::client_port]: Request failed to [LB::server]"&nbsp;
  }&nbsp;
 when HTTP_RESPONSE { 
    set responsecode [HTTP::status]
    log local0. "Response code is $responsecode"
  if { [HTTP::status] eq 500 } { 
    log local0. "$ipvar requested $hostvar $urivar and received a 500 from [IP::server_addr]"
  }
}&nbsp;

only1masterbla1 · Answer

In general they look OK. Move following line:

&nbsp;log local0. "X-Forwarded-For: [HTTP::header X-Forwarded-For]"

&nbsp;under  HTTP_REQUEST event.&nbsp;

only1masterbla1 · Answer

I don't see any loop scenario. There is always some CPU cycle utilized with iRule execution. After your troubleshooting efforts, you should detach iRule.&nbsp;

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iRULE to troubleshoot cookie

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