Forum Discussion

pjcampbell_7243's avatar
pjcampbell_7243
Icon for Cirrus rankCirrus
Aug 26, 2009

404 error using image pool iRule

We are intermittently getting an "404" error instead of a blank box or box with an X on it on our pages when using the following iRule

 

 

 

 

when HTTP_REQUEST {

 

if { [HTTP::path] ends_with ".jpg" }{

 

pool images.xyz.com

 

}

 

 

That is to say we will be surfing on some .jsp page, and a missing image will cause the user to be stopped dead on a 404 error, rather than the image simply not showing up within the .jsp page.

 

 

Any thoughts as to why this would happen?

 

application delivery
dev
devops
iRules
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Aug 26, 2009
    I'd guess the issue is that a request that should go to the default pool on the VIP is going to the image pool. You could explicitly add a default case to the iRule or add a OneConnect profile to the virtual server to prevent this. 

      
 when CLIENT_ACCEPTED {  
     Save default pool name  
    set default_pool [LB::server pool]  
 }  
 when HTTP_REQUEST {  
    if { [HTTP::path] ends_with ".jpg" }{  
       pool images.xyz.com  
    } else { 
       pool $default_pool 
    } 
 }

    For details on OneConnect and pool selection you can review Deb's articles linked from this post:

    http://devcentral.f5.com/Default.aspx?tabid=53&view=topic&postid=30865&ptarget=30875

    and here:

    http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&tpage=1&view=topic&postid=3392157229

    Aaron
  • The_Bhattman's avatar
    The_Bhattman
    Icon for Nimbostratus rankNimbostratus
    Aug 26, 2009
    Well the usual case is that that the request is going to a server in the pool that doesn't contain the image.

     

     

    Thanks,

     

    Chetan

     

  • pjcampbell_7243's avatar
    pjcampbell_7243
    Icon for Cirrus rankCirrus
    Sep 01, 2009
    Thanks for the suggestions. I tried adding the default pool to the iRule, and we are still getting stray non .jpg files getting passed over to the image pool. We have OneConnect on the http virtual server, but not on the https virtual server. I can't really confirm if the stray requests are coming from the http or https virtual (SSL offloaded to the BIG-IP). Should I try enabling oneconnect on the https virtual server?
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Sep 01, 2009
    Can you add some debug to the iRule and try to reproduce the issue? 

     
  when CLIENT_ACCEPTED {   
      Save default pool name 
     set default_pool [LB::server pool] 
  }   
  when HTTP_REQUEST {   
  
     log local0. "[IP::client_addr]:[TCP::client_port]: New HTTP request to [HTTP::host][HTTP::uri]" 
     if { [HTTP::path] ends_with ".jpg" }{   
        log local0. "[IP::client_addr]:[TCP::client_port]: Matched jpg check, using images.xyz.com pool" 
        pool images.xyz.com 
     } else {  
        log local0. "[IP::client_addr]:[TCP::client_port]: Using default pool" 
        pool $default_pool  
     }  
  }   
  when LB_SELECTED { 
     log local0. "[IP::client_addr]:[TCP::client_port]: Pool info: [LB::server]" 
  } 
  when SERVER_CONNECTED { 
     log local0. "[IP::client_addr]:[TCP::client_port]: Connection info: [IP::server_addr]:[TCP::server_port]" 
  }

    Can you also post the VIP and profile configuration using 'b virtual VIP_NAME list' and 'b profile PROFILE_NAME list'. Please anonymize the IP addresses and hostnames from the config and logs.

    Thanks,

    Aaron