Ejemplo python-mapnik

Dockerfile

FROM ubuntu:20.04

RUN apt-get update -y && apt-get install -y apt-utils
RUN apt-get install -y python3-mapnik

WORKDIR /app

COPY . .

map.xml

<Map background-color="blue" srs="+init=epsg:4326">
  <Style name="My Style">
    <Rule>
      <PolygonSymbolizer fill="#f2eff9" />
      <LineSymbolizer stroke="rgb(50%,50%,50%)" stroke-width="0.1" />
    </Rule>
  </Style>
  <Layer name="world" srs="+init=epsg:4326">
    <StyleName>My Style</StyleName>
    <Datasource>
      <Parameter name="type">postgis</Parameter>
      <Parameter name="host">172.17.0.1</Parameter>
      <Parameter name="dbname">curso</Parameter>
      <Parameter name="user">curso</Parameter>
      <Parameter name="password">curso</Parameter>
      <Parameter name="table">(select geom from countries) as "table"</Parameter>
    </Datasource>
  </Layer>
</Map>

postgis2png.py

import mapnik


m = mapnik.Map(1024, 1024)

mapnik.load_map(m, "map.xml")

m.zoom_all()
mapnik.render_to_file(m, "map.png")