Re: Using Enhydra Director as HTTP cookie based load-balancer

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Hi Petr,

We expose a session based XML interface over HTTP and have the same 
problem. Customers won't or can't use cookies or other wise keep their 
HTTP session, so we have implemented our own load balancer (using an 
enhydra servlet actually) that looks at the request (source ip, customer 
ref, session id etc) and balances the load accross our application 
servers accordingly. AFAIK, there is no off-the-shelf solution to 
application level load-balancing.

I don't think enhydra director solves your problem. What you really need 
is a SOAP aware load balancer.

Kind regards,

	/james.

[email protected] wrote:
> Hi,
> I'm looking for a software load-balancer of HTTP (actually SOAP) traffic. Since I was trying many different HTTP servers/application servers and other tools and always failed either because it didn't offer what I needed or it was to difficult to configure I would like to ask if Enhydra can be used as a load-balancer. 
> 
> What I need:
> - software load-balancer that distribute requests according to value in the cookie header in incomming messages (MUST)
> 
> - if no cookie value is provided, it should use Round-Robin to balance the load
> 
> - load-balancer should only re-send the messages to cluster nodes, receive replies and re-send them back to clients (MUST), look below:
> 
> client -> send HTTP request -> LB re-sends -> cluster node gets and replies  --
>                                                                                | 
>        <- get HTTP reply    <- LB re-sends the reply <- cluster node replies <-      
> 
> - between the load-balancer and the cluster nodes should be only the HTTP protocol used (MUST), no AJP12, AJP13, whatever protocol!!! 
> 
> - it should be able load-balance more HTTP requests in one connection (when connection re-use is ON) (MAY)
> 
> - it should be possible to configure the load-balancer in advance so it knows addresses/host names of cluster nodes along with possible cookie values -> a map of cookie value (key) and cluster node host name (value) is set in advanced
> 
> the map looks like:
>   cookie value -> cluster node host name
>   --------------------------------------
>   node1        -> node1.mycompany.com
>   node2        -> node2.mycompany.com
>   node3        -> node3.mycompany.com
> 
> So... does Enhydra Director suit the requirements above? Thanks,
> 
>   Petr Panuska.
> 
> 
> 
> ------------------------------------------------------------------------
> 
> 
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=====================================================

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Email:    James Carnegie <[email protected]>


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