carto project-1.mml > OSMDefault.xml

osm2pgsql: &osm2pgsql
    type: "postgis"
    dbname: "gis"
    host: "<your-server-zone>.rds.amazonaws.com"
    user: "postgres"
    password: "<your-postgres-password>"
    ...

psql -h <host> -p <port> -U <username> -W <password> <database>