Nominatim 2.5 installation on CentOS
This page contains detailed installation instructions for Nominatim on CentOS v7 which has all the required software readily available. CentOS v7 includes PostgreSQL v9.2 and EPEL contains PostGIS v2.0, so there isn’t any extra effort required for obtaining new enough software.
Installing the OS
First, perform a minimal install of CentOS v7, and apply all updates. Keep in mind that you’ll need enough disk space under
/var/lib/pgsql/ as well as potentially 10s of GiBs of space under
Installing the Required Software
Setting up Repositories
The standard CentOS repositories don’t contain all the required packages, you need to enable the EPEL repository as well. To enable it on CentOS, install the
epel-release RPM which is itself now included in the base CentOS repository by running:
yum install epel-release
Getting the Software Packages
Now you can install all packages needed for Nominatim:
yum install postgresql-server postgresql-contrib postgresql-devel postgis postgis-utils yum install git make automake gcc gcc-c++ libtool policycoreutils-python yum install php-pgsql php php-pear php-pear-DB libpqxx-devel proj-epsg yum install bzip2-devel proj-devel geos-devel libxml2-devel boost-devel expat-devel zlib-devel
Setting up PostgreSQL
Starting the Server
Now initialize the database, enable the server to start at boot, and launch PostgreSQL:
postgresql-setup initdb systemctl enable postgresql systemctl start postgresql
Next tune the postgresql configuration, which is located in
/var/lib/pgsql/data/postgresql.conf. See Nominatim 2.5 installation (“PostgreSQL Tuning” section) for the parameters to change. You will need to restart the postgresql service after updating this config file.
systemctl restart postgresql
Nominatim will run as a global service on your machine. It is therefore best to install it under its own separate user account. In the following we assume this user is called
nominatim and the installation will be in
/srv. You may find a more suitable location if you wish.
Never, ever do the following installation as root user. You have been warned.
Downloading and Compiling the Sources
Get the current stable version and unpack it:
cd /srv wget http://www.nominatim.org/release/Nominatim-2.5.1.tar.bz2 tar xvf Nominatim-2.5.1.tar.bz2
Now configure and compile taking into account the special location of postgresql:
cd Nominatim-2.5.1 ./configure make
The warning about missing lua libraries can be ignored. Nominatim does not make use of osm2pgsql’s lua extension.
Configuring the Software
You can customize the installation by adding a localized
settings/local.php. You need to add at least the follow:
<?php // General settings @define(‘CONST_Database_Web_User’, ‘apache’); // Paths @define(‘CONST_Postgresql_Version’, ‘9.2’); @define(‘CONST_Postgis_Version’, ‘2.0’); // Website settings @define(‘CONST_Website_BaseURL’, ‘http://’.php_uname(‘n’).’/nominatim/’);
The website setting should be adapted to your host. If you plan to import a large dataset (e.g. Europe, North America, planet), you should also enable flatnode storage of node locations. This saves node coordinates in a simple file instead of the database and saves both on import time and disk storage. Add to your settings/local.php:
More settings can be found in
Adding SELinux Security Settings
It’s a good idea to leave SELinux enabled and enforcing, particularly with a web server accessible from the Internet. At a minimum the following SELinux labeling should be done for Nominatim:
su - root semanage fcontext -a -t httpd_sys_content_t “/srv/Nominatim/(website|lib|settings)(/.*)?” semanage fcontext -a -t lib_t “/srv/Nominatim/module/nominatim.so” restorecon -R -v /srv/Nominatim
Downloading additional data
The following data is optional but download is strongly recommended:
wget –output-document=data/wikipedia_article.sql.bin http://www.nominatim.org/data/wikipedia_article.sql.bin wget –output-document=data/wikipedia_redirect.sql.bin http://www.nominatim.org/data/wikipedia_redirect.sql.bin wget –output-document=data/gb_postcode_data.sql.gz http://www.nominatim.org/data/gb_postcode_data.sql.gz
Creating Postgresql user accounts
Nominatim requires two postgresql accounts, one for the user importing the database and one for the apache webserver. These can be created as follows:
sudo -u postgres createuser -s nominatim sudo -u postgres createuser apache
Initial Import of the Data
Loading OSM Data
Attention: first try the import with a small excerpt, for example from Geofabrik.
Download the data to import and load the data with the following command:
--osm2pgsql-cache parameter is optional but strongly recommended for planet imports. It sets the node cache size for the osm2pgsql import part (see -C parameter in osm2pgsql help). 24GB are recommended for a full planet import, for excerpts you can use less. Adapt to your available RAM to avoid swapping.
The import will take as little as an hour for a small country extract and as much as 10 days for a full-scale planet import on less powerful hardware.
Loading Additional Datasets
The following commands will create additional entries for countries and POI searches:
./utils/specialphrases.php –countries > data/specialphrases_countries.sql psql -d nominatim -f data/specialphrases_countries.sql ./utils/specialphrases.php –wiki-import > data/specialphrases.sql psql -d nominatim -f data/specialphrases.sql
Setting up the Website
Create the directory for the website and make sure it is writable by you and readable by apache:
mkdir -m 755 /var/www/html/nominatim
Populate the website directory with the necessary symlinks:
./utils/setup.php –create-website /var/www/html/nominatim
Configuring for Use with Apache
Edit the Apache configuration at
and add the following:
<Directory “/var/www/html/nominatim/”> Options FollowSymLinks MultiViews AddType text/html .php </Directory>
After making changes in the apache config you need to restart apache.
systemctl enable httpd systemctl restart httpd
Now you should be able to see the Nominatim website at http://localhost/nominatim.
For further instructions on setting up updates and for troubleshooting see the Nominatim 2.5 installation page.