LB:server breaks my website

Not sure if you've come up with a solution to this already, but I've been using the following persistence iRule to get the load balancer to disable persistence and reselect from a pool of servers with outage content when the LB fails to get a member from the default pool. In my case, breaking the persistence and not having the redirect be visible to the end-user were requirements. May not be the cleanest way to do this, but it seems to work.

 

 

when CLIENT_ACCEPTED {

 

set pool_name [LB::server pool]

 

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

 

set ::persist 0

 

log local0.crit "No available members in pool \"$pool_name\": reselecting from pool \"sorry\"."

 

} else {

 

set ::persist 1

 

}

 

}

 

when HTTP_REQUEST {

 

if { [HTTP::cookie exists "JSESSIONID"] and $::persist>0} {

 

persist uie [HTTP::cookie "JSESSIONID"]

 

}

 

}

 

when HTTP_RESPONSE {

 

if { [HTTP::cookie exists "JSESSIONID"] and $::persist>0} {

 

persist add uie [HTTP::cookie "JSESSIONID"]

 

}

 

}

 

when LB_FAILED {

 

if {$::persist==0}{

 

LB::detach

 

LB::reselect pool "sorry"

 

}

 

}