[Live-demo] Tomcat6 setup for deegree

[Stefan Hansen]

Hey!

I probably have to disagree slightly with Cameron. Given the constraints
of the DVD/VM, I think, Judit's suggestion to start Degree in its on own
servlet container is a good idea. Having everything in the already
installed tomcat basically means that you have to run all apps deployed
on Tomcat, even if you want to run only one. Especially Deegree seems to
require a fair amount of resources. So keeping it separated makes sense
to me. We probably should do the same with Geoserver. It usually comes
with jetty anyway, which is rather lightweight and therefore a good
choice for our purposes.

As far as Postgres/gis is concerned, I think, it might be a good idea to
have a single instance running that is started during the boot process.
  Many of the apps on the VM/DVD will be able to access it. It could
provide a rather limited sample data set, which the other apps can use
in their examples. Of course we can also start postgres whenever an app
is started, that wants to use it. However, when I worked on the earlier
version of Arramagong I played a bit around with that option and got the
impression, that we don't gain too much by doing that.

cheers,
stefan

Cameron Shorter wrote:
> Judit,
> You raise some good points here.
> As per: http://wiki.osgeo.org/wiki/GISVM_Build#Build_Drivers
>
> The GISVM and LiveDVD is targeted at a demo version. The aim is to
> highlight the product features, but it not expected to be tuned for high
> capacity of complicated scenarios.
>
> Our biggest constraining factor is lack of RAM. So to work around this,
> the policy is:
>
>    1. Do not start applications upon power up. (Ie, don't start deamons,
>       allow users to start them instead).
>    2. Set up examples which, by default, don't depend on other
>       applications. Less applications open, means less memory. Ie, Have
>       GeoServer access a shapefile instead of PostGIS.
>    3. Try to avoid scenarios which write data to disk, as disk space in
>       the Live DVD is stored in RAM, and is not cleared afterward.
>
> In your case, I suggest that you install all your applications into the
> one tomcat webapp rather than starting another. I'm assuming that having
> two web applications in the same webapp will not mean the RAM is
> consumed until the application is activated. Is this correct?
>
> If possible, I suggest that you allow the user to turn on Deegree web
> apps individually. Ie, create a different desktop icon for Deegree WMS,
> Deegree WFS, ...
>
>
> Judit Mays wrote:
>> Hello all,
>> I've got a general question about the prefered set-up using the tomcat:
>>
>> Do you prefer to have all the deegree war-archives inside
>> /var/lib/tomcat6/webapps?
>> Or would you prefer to have deegree bring along its own tomcat, instead
>> of sharing it with GeoServer or other web applications?
>>
>> I've got a bit of a problem. I see that tomcat6 is running with a Java
>> heap space of 128MB. This is not enough. I would suggest 512MB for the
>> tomcat at least.
>>
>> And I don't know if it is such a good idea to add all deegree webapps
>> (wms, wfs, wcs, csw, wps, wpvs, iGeoPortal) either. Especially if these
>> webapps get started on start up of the system. This will reduce
>> performance not only for deegree, but also for any other webapp in
>> tomcat6 and maybe even for other desktop applications (depending on the
>> memory of the system).
>>
>> After all, we are talking about server applications that have specific
>> hardware needs. You can't expect every laptop and desktop pc to live up
>> to these needs. Are there any hardware specifics that you plan to
>> provide with the DVD?
>>
>> What I could do is reduce the list of deegree demo services to WFS, WMS,
>> WCS (like GeoServer) and the deegree web client iGeoPortal.
>> Since WPS and WPVS are working better in deegree3 already, this wouldn't
>> be such a bad idea. A demo for those services on LiveDVD would then have
>> to wait until deegree3 is stable.
>>
>> Any thoughts, ideas or suggestions?
>>
>> Kind regards,
>> Judit
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
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>> Live-demo at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/live-demo
>>
>
>


--
Stefan Hansen
Software Engineer
LISAsoft

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