+
+*Note:* these installation instructions are also available in executable
+ form for use with vagrant under vagrant/install-on-centos-7.sh.
+
+Installing the Required Software
+================================
+
+These instructions expect that you have a freshly installed CentOS version 7.
+Make sure all packages are are up-to-date by running:
+
+ sudo yum update -y
+
+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 by running:
+
+ sudo yum install -y epel-release
+
+Now you can install all packages needed for Nominatim:
+
+ sudo yum install -y postgresql-server postgresql-contrib postgresql-devel postgis postgis-utils \
+ git cmake make gcc gcc-c++ libtool policycoreutils-python \
+ php-pgsql php php-pear php-pear-DB libpqxx-devel proj-epsg \
+ bzip2-devel proj-devel geos-devel libxml2-devel boost-devel expat-devel zlib-devel
+
+If you want to run the test suite, you need to install the following
+aditional packages:
+
+ sudo yum install -y python-pip python-Levenshtein python-psycopg2 \
+ php-phpunit-PHPUnit
+ pip install --user --upgrade pip setuptools lettuce==0.2.18 six==1.9 \
+ haversine Shapely pytidylib
+
+
+System Configuration
+====================
+
+The following steps are meant to configure a fresh CentOS installation
+for use with Nominatim. You may skip some of the steps if you have your
+OS already configured.
+
+Creating Dedicated User Accounts
+--------------------------------
+
+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/nominatim. To create the user and directory run:
+
+ sudo useradd -d /srv/nominatim -s /bin/bash -m nominatim
+
+You may find a more suitable location if you wish.
+
+To be able to copy and paste instructions from this manual, export
+user name and home directory now like this:
+
+ export USERNAME=nominatim
+ export USERHOME=/srv/nominatim
+
+**Never, ever run the installation as a root user.** You have been warned.
+
+Make sure that system servers can read from the home directory:
+
+ chmod a+x $USERHOME
+
+Setting up PostgreSQL
+---------------------
+
+CentOS does not automatically create a database cluster. Therefore, start
+with initializing the database, then enable the server to start at boot:
+
+ sudo postgresql-setup initdb
+ sudo systemctl enable postgresql
+
+
+Next tune the postgresql configuration, which is located in
+`/var/lib/pgsql/data/postgresql.conf`. See section *Postgres Tuning* in
+[the installation page](Installation.md) for the parameters to change.
+
+Now start the postgresql service after updating this config file.
+
+ sudo systemctl restart postgresql
+
+
+Finally, we need to add two postgres users: one for the user that does
+the import and another for the webserver ro access the database:
+
+
+ sudo -u postgres createuser -s $USERNAME
+ sudo -u postgres createuser apache
+
+
+Setting up the Apache Webserver
+-------------------------------
+
+You need to create an alias to the website directory in your apache
+configuration. Add a separate nominatim configuration to your webserver:
+
+```
+sudo tee /etc/httpd/conf.d/nominatim.conf << EOFAPACHECONF
+<Directory "$USERHOME/Nominatim/build/website">
+ Options FollowSymLinks MultiViews
+ AddType text/html .php
+ Require all granted
+</Directory>
+
+Alias /nominatim $USERHOME/Nominatim/build/website
+EOFAPACHECONF
+```
+
+
+
+
+Then reload apache
+
+
+ sudo systemctl restart httpd
+
+
+Adding SELinux Security Settings
+--------------------------------
+
+It is a good idea to leave SELinux enabled and enforcing, particularly
+with a web server accessible from the Internet. At a minimum the
+following SELinux labeling should be done for Nominatim:
+
+ sudo semanage fcontext -a -t httpd_sys_content_t "$USERHOME/Nominatim/(website|lib|settings)(/.*)?"
+ sudo semanage fcontext -a -t lib_t "$USERHOME/Nominatim/module/nominatim.so"
+ sudo restorecon -R -v $USERHOME/Nominatim
+
+
+Installing Nominatim
+====================
+
+Building and Configuration
+--------------------------
+
+Get the source code from Github and change into the source directory
+
+
+
+ cd $USERHOME
+ git clone --recursive git://github.com/twain47/Nominatim.git
+ cd Nominatim
+
+
+
+
+
+The code is built in a special directory. Create this directory,
+then configure and build Nominatim in there:
+
+ mkdir build
+ cd build
+ cmake $USERHOME/Nominatim
+ make
+
+You need to create a minimal configuration file that tells nominatim
+the name of your webserver user and the URL of the website:
+
+```
+tee settings/local.php << EOF
+<?php
+ @define('CONST_Database_Web_User', 'apache');
+ @define('CONST_Website_BaseURL', '/nominatim/');
+EOF
+```
+
+
+Nominatim is now ready to use. Continue with
+[importing a database from OSM data](Import_and_update.md).