1 # Advanced installations
3 This page contains instructions for setting up multiple countries in
4 your Nominatim database. It is assumed that you have already successfully
5 installed the Nominatim software itself, if not return to the
6 [installation page](Installation.md).
8 ## Importing multiple regions (without updates)
10 To import multiple regions in your database you can simply give multiple
11 OSM files to the import command:
14 nominatim import --osm-file file1.pbf --osm-file file2.pbf
17 If you already have imported a file and want to add another one, you can
18 use the add-data function to import the additional data as follows:
21 nominatim add-data --file <FILE>
22 nominatim refresh --postcodes
23 nominatim index -j <NUMBER OF THREADS>
26 Please note that adding additional data is always significantly slower than
29 ## Importing multiple regions (with updates)
31 If you want to import multiple regions _and_ be able to keep them up-to-date
32 with updates, then you can use the scripts provided in the `utils` directory.
34 These scripts will set up an `update` directory in your project directory,
35 which has the following structure:
41 │ │ └── sequence.state
46 ├── andorra-latest.osm.pbf
47 └── monaco-latest.osm.pbf
51 The `sequence.state` files contain the sequence ID for each region. They will
52 be used by pyosmium to get updates. The `tmp` folder is used for import dump and
53 can be deleted once the import is complete.
56 ### Setting up multiple regions
58 Create a project directory as described for the
59 [simple import](Import.md#creating-the-project-directory). If necessary,
60 you can also add an `.env` configuration with customized options. In particular,
61 you need to make sure that `NOMINATIM_REPLICATION_UPDATE_INTERVAL` and
62 `NOMINATIM_REPLICATION_RECHECK_INTERVAL` are set according to the update
63 interval of the extract server you use.
65 Copy the scripts `utils/import_multiple_regions.sh` and `utils/update_database.sh`
66 into the project directory.
68 Now customize both files as per your requirements
70 1. List of countries. e.g.
72 COUNTRIES="europe/monaco europe/andorra"
74 2. URL to the service providing the extracts and updates. eg:
76 BASEURL="https://download.geofabrik.de"
77 DOWNCOUNTRYPOSTFIX="-latest.osm.pbf"
79 5. Followup in the update script can be set according to your installation.
82 FOLLOWUP="curl http://localhost:2322/nominatim-update"
84 will handle the indexing.
87 To start the initial import, change into the project directory and run
90 bash import_multiple_regions.sh
93 ### Updating the database
95 Change into the project directory and run the following command:
97 bash update_database.sh
99 This will get diffs from the replication server, import diffs and index
100 the database. The default replication server in the
101 script ([Geofabrik](https://download.geofabrik.de)) provides daily updates.
103 ## Using an external PostgreSQL database
105 You can install Nominatim using a database that runs on a different server when
106 you have physical access to the file system on the other server. Nominatim
107 uses a custom normalization library that needs to be made accessible to the
108 PostgreSQL server. This section explains how to set up the normalization
112 The external module is only needed when using the legacy tokenizer.
113 If you have chosen the ICU tokenizer, then you can ignore this section
114 and follow the standard import documentation.
116 ### Option 1: Compiling the library on the database server
118 The most sure way to get a working library is to compile it on the database
119 server. From the prerequisites you need at least cmake, gcc and the
120 PostgreSQL server package.
122 Clone or unpack the Nominatim source code, enter the source directory and
123 create and enter a build directory.
131 Now configure cmake to only build the PostgreSQL module and build it:
134 cmake -DBUILD_IMPORTER=off -DBUILD_API=off -DBUILD_TESTS=off -DBUILD_DOCS=off -DBUILD_OSM2PGSQL=off ..
138 When done, you find the normalization library in `build/module/nominatim.so`.
139 Copy it to a place where it is readable and executable by the PostgreSQL server
142 ### Option 2: Compiling the library on the import machine
144 You can also compile the normalization library on the machine from where you
148 You can only do this when the database server and the import machine have
149 the same architecture and run the same version of Linux. Otherwise there is
150 no guarantee that the compiled library is compatible with the PostgreSQL
151 server running on the database server.
153 Make sure that the PostgreSQL server package is installed on the machine
154 **with the same version as on the database server**. You do not need to install
155 the PostgreSQL server itself.
157 Download and compile Nominatim as per standard instructions. Once done, you find
158 the normalization library in `build/module/nominatim.so`. Copy the file to
159 the database server at a location where it is readable and executable by the
160 PostgreSQL server process.
162 ### Running the import
164 On the client side you now need to configure the import to point to the
165 correct location of the library **on the database server**. Add the following
166 line to your your `.env` file:
169 NOMINATIM_DATABASE_MODULE_PATH="<directory on the database server where nominatim.so resides>"
172 Now change the `NOMINATIM_DATABASE_DSN` to point to your remote server and continue
173 to follow the [standard instructions for importing](Import.md).
176 ## Moving the database to another machine
178 For some configurations it may be useful to run the import on one machine, then
179 move the database to another machine and run the Nominatim service from there.
180 For example, you might want to use a large machine to be able to run the import
181 quickly but only want a smaller machine for production because there is not so
182 much load. Or you might want to do the import once and then replicate the
183 database to many machines.
185 The important thing to keep in mind when transferring the Nominatim installation
186 is that you need to transfer the database _and the project directory_. Both
187 parts are essential for your installation.
189 The Nominatim database can be transferred using the `pg_dump`/`pg_restore` tool.
190 Make sure to use the same version of PostgreSQL and PostGIS on source and
194 Before creating a dump of your Nominatim database, consider running
195 `nominatim freeze` first. Your database looses the ability to receive further
196 data updates but the resulting database is only about a third of the size
199 Next install Nominatim on the target machine by following the standard installation
200 instructions. Again, make sure to use the same version as the source machine.
202 Create a project directory on your destination machine and set up the `.env`
203 file to match the configuration on the source machine. Finally run
205 nominatim refresh --website
207 to make sure that the local installation of Nominatim will be used.
209 If you are using the legacy tokenizer you might also have to switch to the
210 PostgreSQL module that was compiled on your target machine. If you get errors
211 that PostgreSQL cannot find or access `nominatim.so` then rerun
213 nominatim refresh --functions
215 on the target machine to update the the location of the module.