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Chris__Bloss_10's avatar
Chris__Bloss_10
Icon for Nimbostratus rankNimbostratus
Apr 19, 2007

Terminal Server - Mirror Sessions without persistence on failover

Got an odd one. Need to load balance Terminal Servers with a pair of Big-IP's. The business requires that a user can disconnect a session and reconnect to a new server. Users also have multipule sessions so they want to get a different server with each connection. Catch is that I need the sessions to not disconnect if the F5's are failed over.

 

 

Current config

 

I have no persistence set on the Virtual Server. Everyone gets a clean Terminal server if they disconnect and reconnect. They however do get disconnected if I fail over the F5's.

 

 

Things to try (I don't have a pair in non-prod so hard to test this one)

 

 

Set persistence on the Virtual Server. Apply the following I-Rule.

 

 

when CLIENT_ACCEPTED {

 

persist none

 

}

 

 

 

Anyone know if this will work? Or have a cleaner way to keep the business happy?

 

 

microsoft
partner

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  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Apr 19, 2007
    You need to enable session mirroring on your virtual server to survive a failover. Persistence isn't enabled by default, so you should not need a rule
  • Chris__Bloss_10's avatar
    Chris__Bloss_10
    Icon for Nimbostratus rankNimbostratus
    Apr 19, 2007
    So connection mirroring will keep sessions up during a failover.

     

     

    I was doubting this after the last failover I did the connections listed it the stats went to zero. Guess I need to do more testing to verify before looking for solutions.
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Apr 19, 2007
    the option only shows up if your F5's are configured for HA. From command line, it can be set:

     

     

    b virtual myVip mirror enable

     

    b save

     

     

    FYI, we load balance terminal servers in house and the connection mirroring works great. The end-user experience results in their screen appearing frozen for approx 15 seconds, then all proceeds as normal. HTH.

     

     

    Jason