Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

luyenntk50db's avatar
luyenntk50db
Icon for Nimbostratus rankNimbostratus
Jan 29, 2021

Using an iRule to display a maintenance page when the pool is down

I have configured to redirect Virtual server to maintenance page when all pool member down. I have configured below guide: https://support.f5.com/csp/article/K14702105 When i used irule below, Ir...
application delivery
big-ip
irules
iaine's avatar
iaine
Icon for Nacreous rankNacreous
Feb 01, 2021

OK - so you could either move your html code to a variable and then make a call to it like this

 

when RULE_INIT {
 
set static::sorry_code {
<html>
 
     <head>
 
      <title>Maintenance Page</title>
 
     </head>
 
     <body>
 
     <article>
 
       <center><h1 style="color: #000;">
 
      Xin lỗi quý vị, hệ thống đang được bảo trì. Xin quý vị quay lại sau khi bảo trì hoàn tất.</h1> <center>
 
      <div>
 
    <center><h1 style="color: #000;">Xin trân trọng cảm ơn!.<p></p><center>
 
    </center></h1></center></div>
 
     <article>
 
     </body>
 
   </html>
 
 
}
 
}
 
 
when HTTP_REQUEST { 
 
  if { [active_members [LB::server pool]] == 0 } {
 
   HTTP::respond 200 content $static::sorry_page
 
  }
 
}

...or you could try moving the html code to an iFile - https://clouddocs.f5.com/api/irules/iFile.html - if there are any strange characters in the html code that is causing a conflict then this method should resolve these issues