[FreeNX-kNX] nxserver loadbalance.

[Chris Fanning]

On 4/13/07, Dimitar Paskov <pascoff at nola7.com> wrote:
> > Hi all,
> >
> > I'd like to use a cluster to serve desktops via freeNX.
> > I haven't seen much on the net about it.
> >
> > My initial idea was to do something like use a gateway to divide the
> > sessions between servers with NAT or something along the lines of LVS.
> > But reading in the list I see that Fabian recommends the nxserver
> > loadbalance mecanisms.
> > http://mail.kde.org/pipermail/freenx-knx/2005-July/001546.html
> >
> > Then looking for more info on how to do it, I read this
> > http://www.nomachine.com/ar/view.php?ar_id=AR10B00070
> > that suggests it isn't yet possible.
> >
> > Can someone point out the facts to me?
> >
> > Thanks.
> > Chris.
>
> Yes, there are many ways to accomplish load balancing between nxserver(s) and
> nodes. For example the simplest is to use the built in functions in freenx
> for load balancing and you will have a central nxserver which balances
> connections and sessions between many nodes. But be ware that in this setup
> every connection that you have <client-nxserver-nxnode> will go through this
> load balancer nxserver (check usage of netcat command in nxserver). That
> means if this server fails for some reason (hard disk crash, network
> problems) everything will fail - sessions will crash, session info lost, no
> connection between nodes and clients, etc. Thus this is only for load
> balancing but not for high availability. If you want to make a good cluster
> then you need at least:
> - a central storage for session information (nfs, mysql, etc.)
> - 2 or more nxservers or a little more intelligent nxclient with built load
> balance algorithm and nxserver working on every node
>
> We have mange to make this kind of solution for our company and it has mysql
> storage for session info, load balance algorithm built in nxclient, and
> nxserver on every nxnode. Upon connection nxclient checks which is the least
> loaded server and connects directly to nxserver on it so when trying to
> resume session later it will connect you to the one that has your session.
>
> Another solution is to use openMosix but I haven't try it so I'm not sure how
> to do it.
>
> If you are interested I can give you more detail of the whole setup.

Hi Dimitar,

Yes, I am very interested in knowing more.

Thankyou.
Chris.


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