Is it possible to use a single IHS with multiple WAS-express app server?

SonyRaymond

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Jan 23, 2008, 10:43:38 AM1/23/08

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Hi,

Does any experts know if it is possible to use a single IBM Http server
to work with multiple WAS 6.1-express application servers? Or one-http-server
map to one-application-server is the only solution?

Thanks for your attention,
Raymond

jtpape

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Jan 23, 2008, 5:43:38 PM1/23/08

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IHS servers w/ WebSphere plugins installed are designed to route traffic to more than one Application Server. It is typical to have several HTTP Servers routing traffic to a larger number of AppServers.

John Pape
WebSphere Advisory Software Engineer

Ben_

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Jan 23, 2008, 6:01:54 PM1/23/08

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> IHS servers w/ WebSphere plugins installed are designed to route traffic
> to more than one Application Server. It is typical to have several HTTP
> Servers routing traffic to a larger number of AppServers.

But with Express, you'd need to arrange the plugin configuration file and
the session affinity, no ?

Paul Ilechko

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Jan 23, 2008, 8:16:12 PM1/23/08

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jtpape wrote:
> IHS servers w/ WebSphere plugins installed are designed to route
> traffic to more than one Application Server. It is typical to have
> several HTTP Servers routing traffic to a larger number of
> AppServers.

For WAS ND ...

There's no automatic plugin generation for multiple appservers with
Express. You'd have to hack the plugin manually. Probably better off
doing one to one, overall.

Although if you really need clustering with failover and load balancing,
you should be looking at ND anyway.

SonyRaymond

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Jan 24, 2008, 11:51:26 AM1/24/08

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As in a standalone express server, only one webserver can be managed
(No Add New button to add more webserver for management), when generating
plug-in and propagate to the webserver, only one application server can
update the web server definiation at a time. So I think only "one-to-one"
mapping can exist for http server and application server.

Does any expert can change the plug-in definition manually such that
a single http server can serve multiple application server?

Ben_

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Jan 24, 2008, 1:58:40 PM1/24/08

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Never did it myself, but always been thinking it's feasible.

A catch maybe that, IIRC, in non-clustered the cloneid is set to -1, and
you'll need to change its value in the plugin and in the console (or even
via script maybe) otherwise you won't get session affinity.

This may be useful:
* Merging plugin-cfg.xml files from multiple nodes:
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg21139573.
* Understanding IBM HTTP Server plug-in Load Balancing in a clustered
environment:
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg21219567.

Rico

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Jan 26, 2008, 9:14:56 PM1/26/08

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I am currently doing this. One IHS distributing requests to four WAS
base (not express but AFAIK for the purpose of this feature being
discussed here, they should behave the same). I had to manually edit
the plug-in config and I did have to add a custom property to change
the Clone ID being embedded in the JSESSIONID cookie by WAS.