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Forum Discussion

rwagner1's avatar
rwagner1
Icon for Nimbostratus rankNimbostratus
Aug 09, 2017

iRule Host Header Pool

I'm new to F5 iRule scripting and I'm looking to simplify the following so we don't have to edit the iRule every time we add a new site and pool.   Current   when HTTP_REQUEST { if { [HTTP::h...
application delivery
iRules
LTM
CharlesCS's avatar
CharlesCS
Icon for Cirrus rankCirrus
Aug 09, 2017

This is quick-and-dirty, and doesn't allow for the virtual server receiving a request with an invalid host header:

when HTTP_REQUEST {
  pool [HTTP::host]
}

If you want to get fancier, create a data group ("known_hosts", for example) whose entries are valid host names (and for which you've already created the corresponding pool). 

when HTTP_REQUEST {
  if { [class match [HTTP::host] equals known_hosts] } {
    pool [HTTP::host]
  } else {
     take appropriate action
  }
}