Using iRule to redirect F5 traffic

requests are being made for "; but you want to check the page ";, so [HTTP::host] will not cover what you want to check for. That is ONLY checking the host portion of the URL, and from your question you don't want to check that either, you want to check the content of the page ";

1- set a health check for your pool members to do a GET and look for "Offline" in the page.

2- use an iRule to determine the health of a pool and then re direct otherwise:

when CLIENT_ACCEPTED { set DEFAULT_POOL [LB::server pool] }

when HTTP_REQUEST {

if {[active_members $DEFAULT_POOL] == 0} {

    HTTP::respond 301 Location "http://www.google.com"

} else {

    pool $DEFAULT_POOL
}

}