Forum Discussion

rwagner1's avatar
rwagner1
Icon for Nimbostratus rankNimbostratus
Aug 16, 2017

iRule for App Offline

We currently use an iRule to display an app offline page when the connection to the server is down. I would like to some how to make this as generic as possible due to wanting to use host headers. He...
application delivery
iRules
LTM
Hectorm_262752's avatar
Hectorm_262752
Icon for Cirrus rankCirrus
Aug 18, 2017

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 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 "$Vheader"

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]

             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

}

  • Hectorm_262752's avatar
    Hectorm_262752
    Icon for Cirrus rankCirrus
    Aug 18, 2017
    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 "$Vheader"

 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]

                 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
}
  • Hectorm_262752's avatar
    Hectorm_262752
    Icon for Cirrus rankCirrus
    Aug 18, 2017

    Let me know if this works for you

     

  • rwagner1's avatar
    rwagner1
    Icon for Nimbostratus rankNimbostratus
    Aug 22, 2017

    Can I replace the HTTP::redirect "; with HTTP::respond 200 content [ifile get App_Offline]

     

  • rwagner1's avatar
    rwagner1
    Icon for Nimbostratus rankNimbostratus
    Aug 22, 2017

    I'm really new to iRules and I'm not sure what the set SiteName "XXXX.MAINTENANCEPAGE.org" references. Why would I have a default SiteName if I'm using host headers?