Question : Page redirection to Maintenance page when pool members are down

an example can be found here, it does a bit more then you request and doesn't trigger on all pool members down, but if you understand it then that shouldn't be an issue:

https://devcentral.f5.com/articles/irule-maintenance-windows

You can try:

when LB_FAILED {

if { [active_members [LB::server pool]] < 1 } {

HTTP::fallback "http://host.domain.com/redirect.html"

}

}

there are a couple of options such as what bigip version are you running (9.x/10.x or 11.x)?, where is maintenance page (server or bigip)?, would you like to change url shown on a browser?

if maintenance page is on server and you just want http redirection, Vitaliy's irule or something like below may be usable.

e.g.

root@(ve11a)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list ltm rule myrule
ltm rule myrule {
    when HTTP_REQUEST {
  if { [active_members [LB::server pool]] < 1 } {
    HTTP::redirect "http://www.google.com"
  }
}
}

hope this helps.

I use the redirect method all the time. However my code looks more like this ( == 0 , as in no active members)

Or even:

ltm rule myrule {
    when HTTP_REQUEST {
  if { [active_members [LB::server pool]] == 0 } {
    HTTP::redirect "http://www.google.com"
  }
}
}

another good idea is to keep Maintenance page ( HTML ) as iFile on F5 device and use an iRule:

 when HTTP_REQUEST {
    if {[active_members [LB::server pool]] < 1} {   
    HTTP::respond 200 content [ifile get iFile_name]
    }
    }