[FreeNX-kNX] Load Balancing

[Kurt Godric]

I am currently running the load algorythm on a cluster with 20 nodes and it is working well.  Although I do see the issue with not being able to load balance the master nodes, there may be ways around it by using a commercial load balancer like a ServerIron.  I have yet to explore the capability, but I plan to.

My plan is to take 2 masters and build replication between the two.  Then configure them as independent NX load balancers and then create a clister VIP address from the SLB appliance that uses the MAC address of the client computer to create a session token that ensures that the session remains static through the specific route.  If the master node that session is on happens to stop working, all they need to do is reconnect and resume their session from through the other master node.

No idea if it will work, but it is worth a try.


> Hi,
> 
> 
> 
> Because I am also interested in FreeNX Load Balancing here what I now (assume) compared how it works with Citrix Metaframe:
> 
> 
> 
> The Client connects to the Load Balancer and depending on the Algorithm (Random, Round Robin, Load) gets forwarded to the final Server. 
> 
> 
> 
> If the servers share the same session DB (high available NFS share) it would be possible to connect to every Server directly and get redirected to the correct host (all machines are loadbalancer and NX server). 
> 
> 
> 
> The problem I saw during my tests was that the Machine making the load balancing is always a single point of failure because the session isn't redirected but goes through the loadbalancer (which costs bandwidth and performance on the loadbalancer) so when the loadbalancer goes down the connections to the nxservers go also down, till the load balancer (or an other loadbalancer with the same session DB) is available again.
> 
> 
> 
> Here is how this is handled in ICA (Citrix Metaframe) which is only running on Solaris and other commercial UNIX but not Linux :(
> 
> 
> 
> The Client connects to any of the ICA servers and the server checks if there is a session running for the user or not. If not or the user chooses to make a new session the server forwards the client to the best server available depending on the load balancing algorithm. The client starts a connection directly with the new server. So if any ICA server goes down only the sessions on this server are affected.
> 
> 
> 
> Please correct me if I am wrong in any point or the FreeNX can be configured for better availability (sessions doesn't go through loadbalancer).
> 
> 
> 
> Currently we have between 60 and 100 concurrent sessions on one server and a high need to use load balancing on further machines. I currently have a nice test environment so I can test all suggestions and write a small howto for load balancing.
> 
> 
> 
> Cheers
> 
> Florian
> 
> 
> 
> -------- Original-Nachricht --------
> 
> > Datum: Mon, 4 Aug 2008 15:59:16 -0500
> 
> > Von: "7th Sign | Iván Rico" <7th_sign at soy-geek.com>
> 
> > An: "User Support for FreeNX Server and kNX Client" <freenx-knx at kde.org>
> 
> > Betreff: [FreeNX-kNX] Load Balancing
> 
> 
> 
> > Hello list,
> 
> > 
> 
> > If I want to give NX sessions for about 300 users, I'm going to need more
> 
> > power than 1 Server, I'm going to need something like a cluster.
> 
> > therefore I wonder if FreeNX supports load balancing.
> 
> > 
> 
> > if so... How can I do that? are there a manual, URL or something like
> 
> > that?
> 
> > if not, what are your recomendations?
> 
> > 
> 
> > 
> 
> > 7th Sign | Iván Rico
> 
> 
> -- 
> Psssst! Schon vom neuen GMX MultiMessenger gehört?
> Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
> ________________________________________________________________
>      Were you helped on this list with your FreeNX problem?
>     Then please write up the solution in the FreeNX Wiki/FAQ:
>   http://openfacts.berlios.de/index-en.phtml?title=FreeNX_FAQ
>          Don't forget to check the NX Knowledge Base:
>                  http://www.nomachine.com/kb/ 
> 
> ________________________________________________________________
>        FreeNX-kNX mailing list --- FreeNX-kNX at kde.org
>       https://mail.kde.org/mailman/listinfo/freenx-knx
> ________________________________________________________________

_________________________________________________________________
Get Windows Live and get whatever you need, wherever you are.  Start here.
http://www.windowslive.com/default.html?ocid=TXT_TAGLM_WL_Home_082008
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/freenx-knx/attachments/20080805/26e83920/attachment.html>