Nominatim/docs/admin/Update.md

Updating the Database

There are many different ways to update your Nominatim database. The following section describes how to keep it up-to-date with Pyosmium. For a list of other methods see the output of ./utils/update.php --help.

!!! warning If you have configured a flatnode file for the import, then you need to keep this flatnode file around for updates as well.

Installing the newest version of Pyosmium

It is recommended to install Pyosmium via pip. Make sure to use python3. Run (as the same user who will later run the updates):

pip3 install --user osmium

Nominatim needs a tool called pyosmium-get-changes which comes with Pyosmium. You need to tell Nominatim where to find it. Add the following line to your settings/local.php:

@define('CONST_Pyosmium_Binary', '/home/user/.local/bin/pyosmium-get-changes');

The path above is fine if you used the --user parameter with pip. Replace user with your user name.

Setting up the update process

Next the update needs to be initialised. By default Nominatim is configured to update using the global minutely diffs.

If you want a different update source you will need to add some settings to settings/local.php. For example, to use the daily country extracts diffs for Ireland from Geofabrik add the following:

// base URL of the replication service
@define('CONST_Replication_Url', 'https://download.geofabrik.de/europe/ireland-and-northern-ireland-updates');
// How often upstream publishes diffs
@define('CONST_Replication_Update_Interval', '86400');
// How long to sleep if no update found yet
@define('CONST_Replication_Recheck_Interval', '900');

To set up the update process now run the following command:

./utils/update.php --init-updates

It outputs the date where updates will start. Recheck that this date is what you expect.

The --init-updates command needs to be rerun whenever the replication service is changed.

Updating Nominatim

The following command will keep your database constantly up to date:

./utils/update.php --import-osmosis-all

(Note that even though the old name "import-osmosis-all" has been kept for compatibility reasons, Osmosis is not required to run this - it uses pyosmium behind the scenes.)

If you have imported multiple country extracts and want to keep them up-to-date, Advanced installations section contains instructions to set up and update multiple country extracts.