Serving multiple styles openstreetmap-carto(4.x versions) and osm-bright from tile server?

Question

I have followed this link to implement serving multiple tile styles from tile server. It says that I just need to update .xml style file path in renderd.conf file. But the openstreetmap carto recent 4.x releases requires specifying --style and --tag-transform-script(lua) during osm2pgsql data import. And if I do that, osm-bright tile serving is not working.

I tried -

sudo osm2pgsql --drop --hstore-all --slim -r pbf -C 32000 --style  /data/
/styles/osm/openstreetmap-carto-master/openstreetmap-carto.style --tag-transform-script  /data/
/styles/osm/openstreetmap-carto-master/openstreetmap-carto.lua  --flat-nodes 
node.cache --number-processes 8 -d gis -U root /data/nydata/new-york-latest.osm.pbf

After this, if I run-

renderd -f -c /usr/local/etc/renderd.conf

It is showing errors for osm-bright style because osm2pgsql query contains openstreetmap-carto.style instead of default.style(default.style is required for osm-bright).

So my question is what should be the correct osm2pgsql query for .pbf data import so that I can use same database for osm-bright and openstreetmap-carto styles both? Or What should be the steps to make a tile server that serves both openstreetmap-carto and osm-bright tiles?

Answer 1

You'll need two different databases, since the one that OSM Bright needs is a different format to the one that OSM Carto needs.

What I tend to do is to generate the mapnik.xml as normal and manually update the database references in there from "gis" to "whatever your 2nd database is called". If you're using renderd it's possible to have multiple styles defined per renderd.conf. In this example "ajt" is one map style; another section would point to another mapnik.xml which in turn would reference a different database.