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Tools for OSM regional extract support

It is hard to maintain OSM tile service with a small server: you can't have a properly updated regional extract or even run osm2pgsql on low memory. Here are some scripts that would help.

init-planet-region.sh

Download planet.osm, cuts a polygon, updates it to today, loads it into the database with osm2pgsql, and then optionally creates an sql archive and uploads it to a remote server. On the second run does not use a planet file, instead updates an extract. See configuration options in first lines of the script.

load-osm.sh

What if you don't want to update OSM data minutely, but prefer instead to have as much data as possible? Rent a separate hourly-priced droplet, log in as root and upload this script, a style files and an OSM extract. Run ./load-osm.sh init, enter a password for osm user when asked. Then log out.

Log in to the droplet as osm user. Start a screen, inside it run ./load-osm.sh loadc <style> <extract> (load if you need "slim" tables). Ctrl+A, Ctrl+D, Ctrl+D to log out; in some hours log back in and type screen -r to resume screen session.

When finished, run ./load-osm dump to create a database dump, or, if every byte counts, use ./load-osm transmit user@ip to send PostgreSQL dump directly to your server. After downloading the produces sql dump, the droplet can be destroyed.

You should put correct user name and database name in the load-osm.sh header.

Linux builds supported: Fedora 19 and 20, Ubuntu 12.04 and 14.04, Debian 7.

Limit disk space for updating

Add those lines before seq=... in openstreetmap-tiles-update-expire script (for some reason version with stat did not work):

MIN_DISK_SPACE_MB=500

if `python -c "import os, sys; st=os.statvfs('$BASE_DIR'); sys.exit(1 if st.f_bavail*st.f_frsize/1024/1024 > $MIN_DISK_SPACE_MB else 0)"`; then
    m_info "there is less than $MIN_DISK_SPACE_MB MB left"
    exit 4
fi

trim_osc.py

Trims osmChange file to a bbox or a polygon. It takes into consideration osm2psql slim database tables, so no node or way is lost. It is recommended to increase update interval to 5-10 minutes, so changes accumulate and ways could be filtered more effectively.

To include the script into mod_tile update cycle, add those lines to openstreetmap-tiles-update-expire script, between osmosis and osm2pgsql:

m_ok "filtering diff"
if ! /path/to/trim_osc.py -d gis -p /path/to/region.poly -z $CHANGE_FILE $CHANGE_FILE 1>&2 2>> "$RUNLOG"; then
    m_error "Trim_osc error"
fi

On a 16.5 GB database without this script planet diffs amounted to 600-650 MB daily. After the script was installed, the daily increase fell to 140 MB.

This script needs python-psycopg2 and python-shapely packages installed.