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Ben_Lamb_227759's avatar
Ben_Lamb_227759
Icon for Nimbostratus rankNimbostratus
May 03, 2016

Persistence causing problems with redirection iRule?

I have a slightly strange case on website where I am seeing traffic being redirected strangely, and I believe it may be down to my persistence. I was wondering if anyone could advise on if what I am ...
application delivery
cookie persistence
iRules
LTM
  • Hannes_Rapp_162's avatar
    Hannes_Rapp_162
    May 03, 2016

    You're missing a else-clause (default action) in your iRule. In other words, once a request lands in your test pool, there's no way to return to default pool (since the balancing decision is already locked in).

    when HTTP_REQUEST {
   Save the name of default pool (as configured in VS Resources Tab) as a variable, before it can be modified by conditional actions below
  set poolDefault [LB::server pool]

  if { "[HTTP::host][HTTP::uri]" starts_with "www.website.com/test" } {
    pool test_pool
  } else {
    pool $poolDefault
  }
}

    Similar problem here: https://devcentral.f5.com/questions/incorrect-load-balancing-when-disabling-oneconnect

Hannes_Rapp_162's avatar
Hannes_Rapp_162
Icon for Nacreous rankNacreous

You're missing a else-clause (default action) in your iRule. In other words, once a request lands in your test pool, there's no way to return to default pool (since the balancing decision is already locked in).

when HTTP_REQUEST {
   Save the name of default pool (as configured in VS Resources Tab) as a variable, before it can be modified by conditional actions below
  set poolDefault [LB::server pool]

  if { "[HTTP::host][HTTP::uri]" starts_with "www.website.com/test" } {
    pool test_pool
  } else {
    pool $poolDefault
  }
}

Similar problem here: https://devcentral.f5.com/questions/incorrect-load-balancing-when-disabling-oneconnect

Hannes_Rapp_162's avatar
Hannes_Rapp_162
Icon for Nacreous rankNacreous
May 03, 2016
Maybe this thread will answer your questions. I've given a more detailed answer there, so hopefully you can follow the logic. https://devcentral.f5.com/s/feed/0D51T00006i7caLSAQ