[GIS] Mapserver – Error setting up simple WMS/Mapcache service

mapserverwms

I've got a Ubuntu 12.04 computer with Mapserver and all other software on it. I have tried to set up a simple WMS / Mapcache service but have not succeeded. I can browse to the automatically generated demo page, and they work per se, but all I get are red tiles (i.e. broken)

I think there's something wrong in the configuration files, regarding referencing map or layers.

Mapcache.xml: http://paste.org/67836

simple.map: http://paste.org/67837

I get this error message:

[Mon Oct  7 15:41:30 2013].708630 msWMSLoadGetMapParams(): WMS server error. Invalid     layer(s) given in the LAYERS parameter. A layer might be disabled for this     request. Check wms/ows_enable_request settings.
[Mon Oct  7 15:41:30 2013].708691 mapserv request processing time (msLoadMap not     incl.): 0.000s
[Mon Oct  7 15:41:30 2013].708712 msFreeMap(): freeing map at 0x18fa670.

Best Answer

I just tried your configuration and it worked for me, both the mapfile and the mapcache config. I suspect that your mapcache is not configured properly with the mapcache.xml.

Since you did get an error message, the request is sent to MapServer and it simply doesn't find your layer in the mapfile. Please make sure you point to the right mapfile in the mapcache config and that your mapcache config is correctly configured in Apache:

http://mapserver.org/mapcache/install.html

Note that each time you modify the MapCache config, you need to restart Apache since it runs (usually) as a module.

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Solved. With this configuration in the MapProxy yaml file:

services:
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    image_formats: ['image/jpg', 'image/png']

layers:
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  title: My layer
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sources:
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[GIS] MapServer WMS not configured properly

[SOLVED] Posting my last comment as the answer because it really did solve the problem. Found out the MapServer User forum that a proper WMS call does not use the "MODE=map" option. When one does that, it's not a WMS call but a MapServer call. Therefore, MapServer specific values are required (e.g. imgext, mapext). Taking out the "MODE=map" and then using a point layer vs the raster I started to work with did indeed use the BBOX, HEIGHT, and WIDTH values in the WMS options to properly display the layer over the map area. The reason I had thought "MODE=map" was needed was that I would get an error with the raster layer I started to work with and it would go away if I put it back in. But, I then tried with a points layer with the same EPSG as the map (raster was different and real cause of that error) and that worked when I didn't use the "MODE=map" in the options. unicoletti was essentially correct that the mapserver link provided the answer. But, I couldn't see this detail in the doc due to the other error I was getting with the raster layer. A person on the MapServer User forum I asked the question to told me outright that including "MODE=map" makes the call a MapServer call and that expects different parameters (i.e. imgext, mapext), whereas taking MODE=map out and using the WMS options for GetMap makes it a WMS call. BTW, I also solved the problem with the raster layer. I was getting an error indicating the SRS had to be the same for the layers which didn't initially make sense according to the MapServer docs and how I had structured the mapfile. But, searched for the error, reread the MapServer docs, saw other possible answers on the user forums, changed around the mapfile, and finally got it to work. Thanks for the comments and to all for considering this problem!

Best Answer

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