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Johnde's avatar
Johnde
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Mar 16, 2020
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Multiple Web Applications behind single VS

I am planning to configure multiple applications/URLs behind one Virtual server for saving my public IPs. Please suggest me how can i achieve it?
application delivery
BIG-IP
LTM
security
virtual server
  • Mayur_Sutare's avatar
    Mayur_Sutare
    Mar 16, 2020

    Hello John,

     

    You can do it using iRule. Please refer below iRule.

     

    when HTTP_REQUEST 

    {

      switch [HTTP::host] {

       

    "abc.com" {pool abc-pool}

    "xyz.com" {pool xyz-pool}

                 }

              }

     

    In this way, you can add multiple application urls alongwith its associated pool. Entries here are case sensitive. Also make sure Virtual Server Configuration like SSL& http profiles, SNAT etc is proper to handle all requests.

     

    Hope this will fulfill your requirement!

     

    Mayur

Johnde's avatar
Johnde
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 Thanks!!!! Above iRule worked for me. Just quick question, how many maximum entries can i add in one iRule? Is there any limitation?

Beaker's avatar
Beaker
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Mar 17, 2020

So we have this set up and there is no real limit but processing of the iRule gets slower the longer the rule is. We had a rule that was 2000+ lines that worked fine. If you have 30+ entires the processing starts to slow after each additional entry. I would suggest is using that many entries using a data group to store the entries.

 

We use

set pool [class match -value [HTTP::host][HTTP::uri] starts_with dg_shared-vip]

 

Then do check of of pool like if it needs SSL to the pool

and finish with

pool $pool

 

the data group is a string list with the string being the host/uri and value being the pool.

 

Using this we have save a lot of IP space and adding entries is simple and fairly silo'd from error.

 

  • Johnde's avatar
    Johnde
    Icon for Cirrus rankCirrus
    Mar 17, 2020

    Hello Beaker,

     

    This is also helpful. Thank you so much.