How to create an iRule with that cascades 3 sequential failover pools

[Chung_Yu]

Hi everyone

I am trying to create an irule where, if the default pool fails - I drop into a standby pool, and if that one fails another web pool and finally a last hop pool

I am trying to put it together like this but there is a problem with my syntax which I have not yet gotten to work.

when HTTP_REQUEST { 

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

   pool pool_standby

 } else {

  if { ([active_members webcache_pool_standby] ==

 0) } 

  pool next_backend

 else 

 { if ([active_members web_backend] ==

 0)}

 pool last_pool

 }

}

Any help would be appreciated.

Thanks

Chung

[NAG]

Hi Chung,

It will be much easier to implement the same by combining all in to one pool and using priority groups to organise then in to three groups with different priority.

https://www.youtube.com/watch?v=uQj6T-hmYfE

https://devcentral.f5.com/s/question/0D51T00006i7Y5r/priority-group-activation-why-use-it

Hope this helps.

Nag