Nominatim/docs/admin/Advanced-Installations.md

Advanced installations

This page contains instructions for setting up multiple countries in your Nominatim database. It is assumed that you have already successfully installed the Nominatim software itself, if not return to the installation page.

Importing multiple regions (without updates)

To import multiple regions in your database you can simply give multiple OSM files to the import command:

nominatim import --osm-file file1.pbf --osm-file file2.pbf

If you already have imported a file and want to add another one, you can use the add-data function to import the additional data as follows:

nominatim add-data --file <FILE>
nominatim refresh --postcodes
nominatim index -j <NUMBER OF THREADS>

Please note that adding additional data is always significantly slower than the original import.

Importing multiple regions (with updates)

If you want to import multiple regions and be able to keep them up-to-date with updates, then you can use the scripts provided in the utils directory.

These scripts will set up an update directory in your project directory, which has the following structure:

update
    ├── europe
    │   ├── andorra
    │   │   └── sequence.state
    │   └── monaco
    │       └── sequence.state
    └── tmp
        └── europe
                ├── andorra-latest.osm.pbf
                └── monaco-latest.osm.pbf

The sequence.state files contain the sequence ID for each region. They will be used by pyosmium to get updates. The tmp folder is used for import dump and can be deleted once the import is complete.

Setting up multiple regions

Create a project directory as described for the simple import. If necessary, you can also add an .env configuration with customized options. In particular, you need to make sure that NOMINATIM_REPLICATION_UPDATE_INTERVAL and NOMINATIM_REPLICATION_RECHECK_INTERVAL are set according to the update interval of the extract server you use.

Copy the scripts utils/import_multiple_regions.sh and utils/update_database.sh into the project directory.

Now customize both files as per your requirements

1. List of countries. e.g.

    COUNTRIES="europe/monaco europe/andorra"
   

2. URL to the service providing the extracts and updates. eg:

    BASEURL="https://download.geofabrik.de"
    DOWNCOUNTRYPOSTFIX="-latest.osm.pbf"
   

3. Followup in the update script can be set according to your installation. E.g. for Photon,

    FOLLOWUP="curl http://localhost:2322/nominatim-update"
   

   will handle the indexing.

To start the initial import, change into the project directory and run

    bash import_multiple_regions.sh

Updating the database

Change into the project directory and run the following command:

bash update_database.sh

This will get diffs from the replication server, import diffs and index the database. The default replication server in the script(Geofabrik) provides daily updates.

Importing Nominatim to an external PostgreSQL database

You can install Nominatim using a database that runs on a different server when you have physical access to the file system on the other server. Nominatim uses a custom normalization library that needs to be made accessible to the PostgreSQL server. This section explains how to set up the normalization library.

Option 1: Compiling the library on the database server

The most sure way to get a working library is to compile it on the database server. From the prerequisites you need at least cmake, gcc and the PostgreSQL server package.

Clone or unpack the Nominatim source code, enter the source directory and create and enter a build directory.

cd Nominatim
mkdir build
cd build

Now configure cmake to only build the PostgreSQL module and build it:

cmake -DBUILD_IMPORTER=off -DBUILD_API=off -DBUILD_TESTS=off -DBUILD_DOCS=off -DBUILD_OSM2PGSQL=off ..
make

When done, you find the normalization library in build/module/nominatim.so. Copy it to a place where it is readable and executable by the PostgreSQL server process.

Option 2: Compiling the library on the import machine

You can also compile the normalization library on the machine from where you run the import.

!!! important You can only do this when the database server and the import machine have the same architecture and run the same version of Linux. Otherwise there is no guarantee that the compiled library is compatible with the PostgreSQL server running on the database server.

Make sure that the PostgreSQL server package is installed on the machine with the same version as on the database server. You do not need to install the PostgreSQL server itself.

Download and compile Nominatim as per standard instructions. Once done, you find the normalization library in build/module/nominatim.so. Copy the file to the database server at a location where it is readable and executable by the PostgreSQL server process.

Running the import

On the client side you now need to configure the import to point to the correct location of the library on the database server. Add the following line to your your .env file:

NOMINATIM_DATABASE_MODULE_PATH="<directory on the database server where nominatim.so resides>"

Now change the NOMINATIM_DATABASE_DSN to point to your remote server and continue to follow the standard instructions for importing.