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What specs would you recommend for an OSM tile server dedicated to serving tiles for a single, small country (e.g., Portugal only)? Total server load is estimated to be no more than two/three users accessing tiles at the same time.

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As mapperz pointed out, your load is probably small enough that anything you have will do. If you have some flexibility though, try for fast disks (ideally SSD) and more memory. I suggest fast disks and memory because these are likely to be the limiting factors (for the postgres database instance).

It is interesting to look how openstreetmap does it: http://wiki.openstreetmap.org/wiki/Servers documents their servers. Given their load, it isn't really a lot of machines doing the tiles work...

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For users who are looking for such requirement. Here is simple solution to create all openstreetmap tiles for a single country osm-for-my-country. There are scripts for all tasks on a Linux machine:

  • Install all necessary software like osm2pgsql, postgres, mapnik, kosmtik etc

  • Download your country data

  • Download and install map style openstreetmap-carto

  • Create all tiles for your country

  • Update tiles on daily basis

  • Serve tiles with node.js or you can serve these offline map tiles with any simple http serevr or apache

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