[MapProxy] Combining multiple sources

[Hendrik Horeis]

Hello everyone!

We're trying to set up different backends for different parts of the world
(i.e. two backend servers per continent). The backends will all be
Mapproxy-Mapnik installations and will provide TMS service.
Here's what we got so far for the frontend proxy config:

services:
  demo:
  tms:
  wmts:
layers:
  - name: hyper
    title: hyper
    sources: ['osm_cache']
caches:
  osm_cache:
    sources:
      - osmdev
      - osmdev2
      - osmdev3
    disable_storage: true
sources:
  osmdev2:
    type: tile
    grid: osm_grid
    url:
http://osmdev2.flx.bn/tiles/1.0.0/hypso/EPSG900913/%(z)s/%(x)s/%(y)s.png
    coverages: ['uruguay']
    transparent: true
  osmdev:
    type: tile
    grid: osm_grid
    url:
http://osmdev.flx.bn/tiles/1.0.0/hypso/EPSG900913/%(z)s/%(x)s/%(y)s.png
    coverages: ['paraguay']
    transparent: true
  osmdev3:
    type: tile
    grid: osm_grid
    url:
http://osmdev3.flx.bn/tiles/1.0.0/hypso/EPSG900913/%(z)s/%(x)s/%(y)s.png
    transparent: true
grids:
  osm_grid:
    srs: EPSG:900913
    origin: nw
globals:
  image:
    formats:
      image/png:
        resampling_method: bilinear
        encoding_options:
          quantizer: fastoctree
        mode: P
coverages:
  europe:
    datasource: '/opt/osm/styles/polygons/continents/europe.geojson'
    srs: 'EPSG:4326'
  australia:
    datasource: '/opt/osm/styles/polygons/continents/australia.geojson'
    srs: 'EPSG:4326'
  africa:
    datasource: '/opt/osm/styles/polygons/continents/africa.geojson'
    srs: 'EPSG:4326'
  asia:
    datasource: '/opt/osm/styles/polygons/continents/asia.geojson'
    srs: 'EPSG:4326'
  north-america:
    datasource: '/opt/osm/styles/polygons/continents/north-america.geojson'
    srs: 'EPSG:4326'
  central-america:
    datasource:
'/opt/osm/styles/polygons/continents/central-america.geojson'
    srs: 'EPSG:4326'
  south-america:
    datasource: '/opt/osm/styles/polygons/continents/south-america.geojson'
    srs: 'EPSG:4326'
  germany:
    datasource: '/opt/osm/styles/polygons/GM.txt'
    srs: 'EPSG:900913'
[........]

Problem is, from the frontend mapproxy installation, we can only see the
bottommost source. We tried both, with transparent: true and without, with
the same outcome.

Any ideas, where we are mistaken?

Thanks in advance.


--
Hendrik
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