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

Forum Discussion

rschwarz79's avatar
rschwarz79
Icon for Cirrus rankCirrus
Jan 06, 2026
Solved

iRule Pool member(s) offline or disabled

Hello community,

 

is there any way to check if the pool members offline/down (e.q. network or server error) or disabled (by a monitor during a maintenance) using a iRule?

 

The background would be the delivery of an event-specific user information page.

Network or server error => Error Page with Helpdesk-Support infos

Maintenance => simply maintenance site

 

 

Thanks & BR

René

irule
LTM
  • Injeyan_Kostas's avatar
    Injeyan_Kostas
    Jan 07, 2026

    Have not tested but might work with something like this

    of course adjust names, members and messages

    when HTTP_REQUEST {
    if { [LB::status pool my_pool member 10.1.1.1 80] eq "down" &&
		[LB::status pool my_pool member 10.1.1.2 80] eq "down" }{
        HTTP::respond 200 content {
			<html>
				<head>
					<title>Error Page</title>
				</head>
				<body>
					whatever you want to say plus links
				</body>
			</html>
		}
    } elseif { [LB::status pool my_pool member 10.1.1.1 80] eq "session_disabled" &&
		[LB::status pool my_pool member 10.1.1.2 80] eq "session_disabled" }{
		HTTP::respond 200 content {
			<html>
				<head>
					<title>Maintenance Page</title>
				</head>
				<body>
					whatever you want to say
				</body>
			</html>
		}
	}
	else {
        pool my_pool
    }
}

     

4 Replies

  • Injeyan_Kostas's avatar
    Injeyan_Kostas
    Icon for MVP rankMVP
    Jan 06, 2026

    You could use something like this

     

    when HTTP_REQUEST {
   if { {[active_members poolName] < 1} } {
    HTTP::respond 200 content {
      <html>
         <head>
            <title>Apology Page</title>
         </head>
         <body>
            We are sorry, but the site you are looking for is temporarily out of service<br>
            If you feel you have reached this page in error, please try again.
         </body>
      </html>
   }
  }
}

    for more flexibility you could also use iFiles 

    • rschwarz79's avatar
      rschwarz79
      Icon for Cirrus rankCirrus
      Jan 07, 2026

      Hello,

       

      thanks for the answer. But that's don't solve the problem. Funktion "active_members" can't differentiate to pool state offline or disabled.

      I don't want to display just one maintenance message, but two different ones (depending on the pool status). I have no idea if that's even possible.

       

      <If> {

      Pool state -> offline -> Error Page with Helpdesk-Support infos

      }

      <else> {

      Pool state -> disabled -> simply maintenance site

      }

       

       

      Thanks

      • Injeyan_Kostas's avatar
        Injeyan_Kostas
        Icon for MVP rankMVP
        Jan 07, 2026

        Have not tested but might work with something like this

        of course adjust names, members and messages

        when HTTP_REQUEST {
    if { [LB::status pool my_pool member 10.1.1.1 80] eq "down" &&
		[LB::status pool my_pool member 10.1.1.2 80] eq "down" }{
        HTTP::respond 200 content {
			<html>
				<head>
					<title>Error Page</title>
				</head>
				<body>
					whatever you want to say plus links
				</body>
			</html>
		}
    } elseif { [LB::status pool my_pool member 10.1.1.1 80] eq "session_disabled" &&
		[LB::status pool my_pool member 10.1.1.2 80] eq "session_disabled" }{
		HTTP::respond 200 content {
			<html>
				<head>
					<title>Maintenance Page</title>
				</head>
				<body>
					whatever you want to say
				</body>
			</html>
		}
	}
	else {
        pool my_pool
    }
}