Finally, we see what it seems a lighttpd
feature bug that prevents the TileCache debug log get written to lighttpd log file and how to override this issue.
1. TileCache logging
TileCache sends its debug output to the (standard error stream by default. This output includes information like the requested tile (its bounding box and x, y, z coords, where z represents the zoom level), time and whether it was a cache hit or cache miss. This information will be indispensable for debugging or estimating how much time the seeding of a WMS cache will last.
2. Configuring lighttpd to receive TileCache debug output
The very first step to get lighttpd receiving TileCache debug output is that TileCache generates debug output. In the TileCache configuration file the parameter debug must be set to ‘yes’ for every layer whose debug output we want to see.
[cache] type=Disk base=/mnt/geodata/tilecache/ [municipalities] debug=yes type=WMSLayer url=http://myserver/sdi-lugo?service=WMS&transparent=true extension=png size=256,256 bbox=580000,4688000,680000,4850000 layers=municipalities srs=EPSG:23029 extent_type=loose maxResolution=200 levels=10