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wowchens's avatar
wowchens
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Nov 24, 2008

Host Header based Routing

Hello: I have a unique(not sure if its unique) requirement with a bunch of my web sites. I am trying to host like 5 externally facing websites using ONE external IP Address. I am wondering to see if there is an IRule that I can use to differentiate requests based on host headers, instead of using a separate IP for each one of them. These sites are very simple html informational ones.

 

 

Can someone please help with me with an IRule or something.

 

 

Thanks,

 

Chenna
config
design

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  • wowchens's avatar
    wowchens
    Icon for Nimbostratus rankNimbostratus
    Nov 25, 2008
    This is what I got my sites working. Please let me know your expert thoughts on this.

     

    when HTTP_REQUEST {

     

     

    switch [string tolower [HTTP::host]] {

     

    www.domain1.com { pool domain1 }

     

    www.domain2.com { pool domain2 }

     

    default { discard }

     

    }

     

     

    }
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Nov 25, 2008
    That looks great. If you are on 9.4 or higher, you could also use HTTP classes to do this. But the iRule looks fine.

     

     

    Aaron
  • steve_88008's avatar
    steve_88008
    Icon for Nimbostratus rankNimbostratus
    Feb 02, 2009

     

    I am facing this as well. In addtion, what would be the oder of operatiosn for a vip that needs multiple irules? I need to redirectt http to https and route based on host header?
  • dennypayne's avatar
    dennypayne
    Icon for Employee rankEmployee
    Feb 02, 2009
    One note, this does not work with SSL sites, since you can't invoke the iRule before doing the SSL handshake, so unless you have a wildcard cert, you will get hostname mismatches in the browser.

     

     

    The order of operation of iRules should be in the order they are listed in the GUI. There was a bug about this in earlier versions of 9.x, not sure exactly when it got fixed.

     

     

    Denny
  • AndrewO_4840's avatar
    AndrewO_4840
    Icon for Nimbostratus rankNimbostratus
    Feb 12, 2009

    Posted By steve_j on 02/02/2009 8:08 AM

     

    I am facing this as well. In addtion, what would be the oder of operatiosn for a vip that needs multiple irules? I need to redirectt http to https and route based on host header?

     

     

     

    You can also use iRule priority to control which rules are processed first.

     

     

    http://devcentral.f5.com/wiki/default.aspx/iRules/priority.html

     

     

    So you could have your http->https rewrite with a higher priority (so it runs first) followed by a second rule with a lower priority to do the per-domain filtering.