[Tilecache] Tilecache and MapServer

[Tim Langlois]

I've had similar problems.  I successfully implemented Openlayers +
TileCache + MapServer on a RHEL4 box.   However, I tried the same
installation on a newer Fedora Core 5 box and ran into difficulties.
The same as you, I verified that MapServer and Openlayers work
correctly, but when I try to put TileCache into the mix, I get the pink
tiles.  I am beginning to think the version of python may be the
culprit. (FC5 comes with a much newer version).  

Openlayers may disguise any Python errors you are seeing, but if you
take the actual image url from the pink tile and run it in a separate
browser, you may see some python errors which may point you to a
solution.  This is the only advice I can offer right now.

Tim L


On Fri, 2007-04-27 at 15:37 +0100, John Westwood wrote:
> Hello fellow tilecachers
> 
> I am in the process of implementing TileCache and OpenLayers with
> MapServer on Debian Etch. I am serving three MapServer raster layers and
> the Metacarta vmap0 layer. For the first stage I made sure that my
> MapServer layers worked correctly in a standard MapServer interface.
> Next, I went on to an OpenLayers interface and both the local MapServer
> layers and the Metacarta layer were correctly displayed.
> 
> Most recently, I have tried to add Tilecache into the mix, but I cannot
> get it to work with my local MapServer layers; however, it does work
> with the Metacarta layer. When trying to display a MapServer layer all
> that appears are broken links where the tiles should be. I have checked
> my installation of python mapscript with a 'Hello World' program and
> this appears to work fine. The fact that the Metacarta layer is
> displayed seems to imply that all the file and directory permissions are
> ok and that apache has permission to run cgi scripts in the appropriate
> directory. I have checked the apache logs and cannot find anything
> wrong. In tilecache.cgi I have references to my layers, for example a
> MapServer layer:
> 
> [land]
> type=MapServerLayer
> layers=land
> mapfile=/var/www/gbhgis/demo.map
> 
> And the Metacarta layer that does work:
> 
> [vmap0]
> type=WMSLayer
> url=http://labs.metacarta.com/wms/vmap0
> 
> These layers are themselves referenced to by index.html like so:
> 
> var baseLayerLUS = new OpenLayers.Layer.WMS("1930s Land Utilisation",
> document.location+"tilecache.cgi?", {layers: "land", format: "image/png"
> }, {projection: "none"});
> var openLayersWMS = new OpenLayers.Layer.WMS("OpenLayers WMS",
> document.location+"tilecache.cgi?", {layers: "vmap0", format:
> "image/png" });
> 
> 
> I am a bit stumped at the moment. Any ideas or advice on what could be
> wrong would be greatly appreciated. I did notice that there is a
> separate debian directory in the tilecache directory, perhaps this is a
> clue? Or a red herring?
> 
> Thanks,
> 
> Regards,
> 
> John W.
> 
> 
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