iRule for App Offline

Are you using one virtual server/per pool/per site? By that I mean, does each URL(Ex. abc.123.com) has it's own virtual server and pool? If that's the case you could do that via a custom http profile or a simple iRule for each virtual server. In case of the custom http profile you just need to configure the maintenance page's URL in the 'Fallback Host' field. This will do a 302 redirect when all pool members in the pool associated with the virtual server are down. A simple iRule like the following will get you the same result: when LB_FAILED { HTTP::redirect "; } With either one of this options you need to make sure that the health monitors for the pools are intelligent enough to detect services are actually down.

Hope this helps.

Are you using one virtual server/per pool/per site? By that I mean, does each URL(Ex. abc.123.com) has it's own virtual server and pool? If that's the case you could do that via a custom http profile or a simple iRule for each virtual server. In case of the custom http profile you just need to configure the maintenance page's URL in the 'Fallback Host' field. This will do a 302 redirect when all pool members in the pool associated with the virtual server are down. A simple iRule like the following will get you the same result: when LB_FAILED { HTTP::redirect "; } With either one of this options you need to make sure that the health monitors for the pools are intelligent enough to detect services are actually down.

Hope this helps.

when HTTP_REQUEST {

 set the host name and url to lower case
set Vuri [ string tolower [HTTP::uri]]
set Vheader [string tolower [HTTP::host]]

 set the Poolname variable.

set Poolname "pl_abc.123.com"
set poolname2 "pl_def.123.com"
set poolname3 "ghi.123.co"

 set the default site name variable

set SiteName "XXXX.MAINTENANCEPAGE.org"


set Irulename "Irule_$SiteName"
set SiteRedirect "https://$SiteName"
Obtain active poolmembers count and list
set Poolmember [active_members $Poolname ] 
set Poolmemberlist [ active_members -list $Poolname]

set Poolmember2 [active_members $Poolname2 ] 
set Poolmemberlist2 [ active_members -list $Poolname2]

set Poolmember3 [active_members $Poolname3 ] 
set Poolmemberlist3 [ active_members -list $Poolname3]


redirect to maintenance page if poolmembers count is zero

    switch $Vheader {

            abc.123.com {
                    if {$Poolmember < 1} then {
                        log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                        HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                    } else {
                        pool $Poolname 
                    }  
            }
            def.123.com {
                    if {$Poolmember2 < 1} then {
                        log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                        HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                    } else {
                        pool $Poolname2 
                    }  
            }

            ghi.123.com {
                    if {$Poolmember3 < 1} then {
                        log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                        HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                    } else {
                        pool $Poolname3 
                    }  
            }

            default { HTTP::redirect "$SiteRedirect"}
    }   

}

  if the server sends a 500 error code log the error and redirect to maintenance page
when HTTP_RESPONSE {
    switch [HTTP::status] {
        500 {   log local0.alert "The servers is sending back a 500 Error: "
                HTTP::redirect "http://www.benaroyaresearch.org.s3-website-us-west-2.amazonaws.com/" 
            }
        502 { log local0.alert "The servers is sending back a 502 Error: "
                HTTP::redirect "http://www.benaroyaresearch.org.s3-website-us-west-2.amazonaws.com/"
            }
        503 {   log local0.alert "The servers is sending back a 503 Error: "
                HTTP::redirect "http://www.benaroyaresearch.org.s3-website-us-west-2.amazonaws.com/" 
            }
    }

}

when HTTP_REQUEST {

 set the host name and url to lower case
set Vuri [ string tolower [HTTP::uri]]
set Vheader [string tolower [HTTP::host]]

 set the Poolname variable.

set Poolname "pl_abc.123.com"
set poolname2 "pl_def.123.com"
set poolname3 "ghi.123.co"

 set the default site name variable

set SiteName "XXXX.MAINTENANCEPAGE.org"


set Irulename "Irule_$SiteName"
set SiteRedirect "https://$SiteName"
Obtain active poolmembers count and list
set Poolmember [active_members $Poolname ] 
set Poolmemberlist [ active_members -list $Poolname]

set Poolmember2 [active_members $Poolname2 ] 
set Poolmemberlist2 [ active_members -list $Poolname2]

set Poolmember3 [active_members $Poolname3 ] 
set Poolmemberlist3 [ active_members -list $Poolname3]


redirect to maintenance page if poolmembers count is zero

    switch $Vheader {

            abc.123.com {
                    if {$Poolmember < 1} then {
                        log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                        HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                    } else {
                        pool $Poolname 
                    }  
            }
            def.123.com {
                    if {$Poolmember2 < 1} then {
                        log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                        HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                    } else {
                        pool $Poolname2 
                    }  
            }

            ghi.123.com {
                    if {$Poolmember3 < 1} then {
                        log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                        HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                    } else {
                        pool $Poolname3 
                    }  
            }

            default { HTTP::redirect "$SiteRedirect"}
    }   

}

  if the server sends a 500 error code log the error and redirect to maintenance page
when HTTP_RESPONSE {
    switch [HTTP::status] {
        500 {   log local0.alert "The servers is sending back a 500 Error: "
                HTTP::redirect "http://www.benaroyaresearch.org.s3-website-us-west-2.amazonaws.com/" 
            }
        502 { log local0.alert "The servers is sending back a 502 Error: "
                HTTP::redirect "http://www.benaroyaresearch.org.s3-website-us-west-2.amazonaws.com/"
            }
        503 {   log local0.alert "The servers is sending back a 503 Error: "
                HTTP::redirect "http://www.benaroyaresearch.org.s3-website-us-west-2.amazonaws.com/" 
            }
    }

}

There is a way to do it but you need to make sure you follow the config as follow The pool name have to be in lower case and equal to the domain name. This is because we are getting the Header from the request and change it to lower case In this Irule, I am adding the word pl_ but you can remove it Example Http or https://abc.123.com the pool name have to be abc.123.com

when HTTP_REQUEST {

set Vuri [ string tolower [HTTP::uri]] set Vheader [string tolower [HTTP::host]]

set Poolname "$Vheader"

set SiteName "XXXX.MAINTENANCEPAGE.org"

set Irulename "Irule_$SiteName" set SiteRedirect "https://$SiteName"

set Poolmember [active_members $Poolname ] set Poolmemberlist [ active_members -list $Poolname]

             if {$Poolmember < 1} then {
                    log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                    HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                } 
             pool $Poolname

}

There is a way to do it but you need to make sure you follow the config as follow The pool name have to be in lower case and equal to the domain name. This is because we are getting the Header from the request and change it to lower case In this Irule, I am adding the word pl_ but you can remove it Example Http or https://abc.123.com the pool name have to be abc.123.com

when HTTP_REQUEST {

set Vuri [ string tolower [HTTP::uri]] set Vheader [string tolower [HTTP::host]]

set Poolname "$Vheader"

set SiteName "XXXX.MAINTENANCEPAGE.org"

set Irulename "Irule_$SiteName" set SiteRedirect "https://$SiteName"

set Poolmember [active_members $Poolname ] set Poolmemberlist [ active_members -list $Poolname]

             if {$Poolmember < 1} then {
                    log local0.alert "ALERT-TEAM Pool $Poolname is down. This mean $SiteName website is down. IRULE=$Irulename";
                    HTTP::redirect "http://www.YOURPAGE-OFFLINE.COM"
                } 
             pool $Poolname

}

Hi,

I use following irule to manage maintenance page per pool.

with this rule, pool can be assigned by a irule executed before or by an LTM Policy.

when HTTP_REQUEST {
    switch [HTTP::path] {
        "/maintenance/logo.png" {
            HTTP::respond 200 content [ifile get "logo.png"] "Content-Type" "image/png"
            return
        }
        "/maintenance/maintenance.html" {
            HTTP::respond 200 content [ifile get "maintenance.html"] "Content-Type" "text/html"
            return
        }
        "/maintenance/error.html" {
            HTTP::respond 200 content [ifile get "error.html"] "Content-Type" "text/html"
            return
        }
        default {
            set dpool [LB::server pool]
            if { $dpool equals "" } { HTTP::redirect "/maintenance/error.html" ; unset dpool; return}
            if { [active_members $dpool] == 0 } { HTTP::redirect "/maintenance/maintenance.html"; unset dpool; return}
            unset dpool
        }
    }
}

when HTTP_RESPONSE {
  if { [HTTP::status] eq "404" } { HTTP::redirect "/maintenance/error.html" }
}

Maybe I haven't described this properly. We want all sites no matter the top level domain to come into the same VIP. That VIP uses an iRule for the host header to send the connection to the proper pool. I need a generic iRule that will look at the host header and if the pool that corresponds to that host header is down I would like to send the iFile app offline.

Example (abc.123.com, 111.ZZZ.com & 222.BBB.com) all have the same public IP and come into the same F5 VIP, however the VIP uses an iRule for host headers to send the connection to the correct pool. When that pool just happens to be down I would like an iRule to send an app offline page.

The irule I provided does exactly that! it must run after irule assigning pool.