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* Requirements and notes
* Optional server requirements
* Installation
* Building and customizing your site
* Multisite configuration
* More information


Drupal requires:

- A web server. Apache (version 2.0 or greater) is recommended.
- PHP 5.2.4 (or greater) (
- One of the following databases:
- MySQL 5.0.15 (or greater) (
- MariaDB 5.1.44 (or greater) ( MariaDB is a fully
compatible drop-in replacement for MySQL.
- PostgreSQL 8.3 (or greater) (
- SQLite 3.4.2 (or greater) (

For more detailed information about Drupal requirements, including a list of
PHP extensions and configurations that are required, see "System requirements"
( in the online documentation.

For detailed information on how to configure a test server environment using a
variety of operating systems and web servers, see "Local server setup"
( in the online documentation.

Note that all directories mentioned in this document are always relative to the
directory of your Drupal installation, and commands are meant to be run from
this directory (except for the initial commands that create that directory).


- If you want to use Drupal's "Clean URLs" feature on an Apache web server, you
will need the mod_rewrite module and the ability to use local .htaccess
files. For Clean URLs support on IIS, see "Clean URLs with IIS"
( in the online documentation.

- If you plan to use XML-based services such as RSS aggregation, you will need
PHP's XML extension. This extension is enabled by default on most PHP

- To serve gzip compressed CSS and JS files on an Apache web server, you will
need the mod_headers module and the ability to use local .htaccess files.

- Some Drupal functionality (e.g., checking whether Drupal and contributed
modules need updates, RSS aggregation, etc.) require that the web server be
able to go out to the web and download information. If you want to use this
functionality, you need to verify that your hosting provider or server
configuration allows the web server to initiate outbound connections. Most web
hosting setups allow this.


1. Download and extract Drupal.

You can obtain the latest Drupal release from -- the files
are available in .tar.gz and .zip formats and can be extracted using most
compression tools.

To download and extract the files, on a typical Unix/Linux command line, use
the following commands (assuming you want version x.y of Drupal in .tar.gz

tar -zxvf drupal-x.y.tar.gz

This will create a new directory drupal-x.y/ containing all Drupal files and
directories. Then, to move the contents of that directory into a directory
within your web server's document root or your public HTML directory,
continue with this command:

mv drupal-x.y/* drupal-x.y/.htaccess /path/to/your/installation

2. Optionally, download a translation.

By default, Drupal is installed in English, and further languages may be
installed later. If you prefer to install Drupal in another language

- Download a translation file for the correct Drupal version and language
from the translation server:

- Place the file into your installation profile's translations
directory. For instance, if you are using the Standard install profile,
move the .po file into the directory:


For detailed instructions, visit

3. Create the Drupal database.

Because Drupal stores all site information in a database, you must create
this database in order to install Drupal, and grant Drupal certain database
privileges (such as the ability to create tables). For details, consult
INSTALL.mysql.txt, INSTALL.pgsql.txt, or INSTALL.sqlite.txt. You may also
need to consult your web hosting provider for instructions specific to your
web host.

Take note of the username, password, database name, and hostname as you
create the database. You will enter this information during the install.

4. Run the install script.

To run the install script, point your browser to the base URL of your
website (e.g.,

You will be guided through several screens to set up the database, add the
site maintenance account (the first user, also known as user/1), and provide
basic web site settings.

During installation, several files and directories need to be created, which
the install script will try to do automatically. However, on some hosting
environments, manual steps are required, and the install script will tell
you that it cannot proceed until you fix certain issues. This is normal and
does not indicate a problem with your server.

The most common steps you may need to perform are:

a. Missing files directory.

The install script will attempt to create a file storage directory in
the default location at sites/default/files (the location of the files
directory may be changed after Drupal is installed).

If auto-creation fails, you can make it work by changing permissions on
the sites/default directory so that the web server can create the files
directory within it for you. (If you are creating a multisite
installation, substitute the correct sites directory for sites/default;
see the Multisite Configuration section of this file, below.)

For example, on a Unix/Linux command line, you can grant everyone
(including the web server) permission to write to the sites/default
directory with this command:

chmod a+w sites/default

Be sure to set the permissions back after the installation is finished!
Sample command:

chmod go-w sites/default

Alternatively, instead of allowing the web server to create the files
directory for you as described above, you can create it yourself. Sample
commands from a Unix/Linux command line:

mkdir sites/default/files
chmod a+w sites/default/files

b. Missing settings file.

Drupal will try to automatically create a settings.php configuration file,
which is normally in the directory sites/default (to avoid problems when
upgrading, Drupal is not packaged with this file). If auto-creation fails,
you will need to create this file yourself, using the file
sites/default/default.settings.php as a template.

For example, on a Unix/Linux command line, you can make a copy of the
default.settings.php file with the command:

cp sites/default/default.settings.php sites/default/settings.php

Next, grant write privileges to the file to everyone (including the web
server) with the command:

chmod a+w sites/default/settings.php

Be sure to set the permissions back after the installation is finished!
Sample command:

chmod go-w sites/default/settings.php

c. Write permissions after install.

The install script will attempt to write-protect the settings.php file and
the sites/default directory after saving your configuration. If this
fails, you will be notified, and you can do it manually. Sample commands
from a Unix/Linux command line:

chmod go-w sites/default/settings.php
chmod go-w sites/default

5. Verify that the site is working.

When the install script finishes, you will be logged in with the site
maintenance account on a "Welcome" page. If the default Drupal theme is not
displaying properly and links on the page result in "Page Not Found" errors,
you may be experiencing problems with clean URLs. Visit to troubleshoot.

6. Change file system storage settings (optional).

The files directory created in step 4 is the default file system path used to
store all uploaded files, as well as some temporary files created by
Drupal. After installation, you can modify the file system path to store
uploaded files in a different location.

It is not necessary to modify this path, but you may wish to change it if:

- Your site runs multiple Drupal installations from a single codebase (modify
the file system path of each installation to a different directory so that
uploads do not overlap between installations).

- Your site runs on a number of web servers behind a load balancer or reverse
proxy (modify the file system path on each server to point to a shared file

- You want to restrict access to uploaded files.

To modify the file system path:

a. Ensure that the new location for the path exists and is writable by the
web server. For example, to create a new directory named uploads and grant
write permissions, use the following commands on a Unix/Linux command

mkdir uploads
chmod a+w uploads

b. Navigate to Administration > Configuration > Media > File system, and
enter the desired path. Note that if you want to use private file storage,
you need to first enter the path for private files and save the
configuration, and then change the "Default download method" setting and
save again.

Changing the file system path after files have been uploaded may cause
unexpected problems on an existing site. If you modify the file system path
on an existing site, remember to copy all files from the original location
to the new location.

7. Revoke documentation file permissions (optional).

Some administrators suggest making the documentation files, especially
CHANGELOG.txt, non-readable so that the exact version of Drupal you are
running is slightly more difficult to determine. If you wish to implement
this optional security measure, from a Unix/Linux command line you can use
the following command:

chmod a-r CHANGELOG.txt

Note that the example only affects CHANGELOG.txt. To completely hide all
documentation files from public view, repeat this command for each of the
Drupal documentation files in the installation directory, substituting the
name of each file for CHANGELOG.txt in the example.

For more information on setting file permissions, see "Modifying Linux,
Unix, and Mac file permissions" ( or
"Modifying Windows file permissions" ( in the online documentation.

8. Set up independent "cron" maintenance jobs.

Many Drupal modules have tasks that must be run periodically, including the
Search module (building and updating the index used for keyword searching),
the Aggregator module (retrieving feeds from other sites), and the System
module (performing routine maintenance and pruning of database tables). These
tasks are known as "cron maintenance tasks", named after the Unix/Linux
"cron" utility.

When you install Drupal, its built-in cron feature is enabled, which
automatically runs the cron tasks periodically, triggered by people visiting
pages of your site. You can configure the built-in cron feature by navigating
to Administration > Configuration > System > Cron.

It is also possible to run the cron tasks independent of site visits; this is
recommended for most sites. To do this, you will need to set up an automated
process to visit the page cron.php on your site, which executes the cron

The URL of the cron.php page requires a "cron key" to protect against
unauthorized access. Your site's cron key is automatically generated during
installation and is specific to your site. The full URL of the page, with the
cron key, is available in the "Cron maintenance tasks" section of the Status
report page at Administration > Reports > Status report.

As an example for how to set up this automated process, you can use the
crontab utility on Unix/Linux systems. The following crontab line uses the
wget command to visit the cron.php page, and runs each hour, on the hour:

0 * * * * wget -O - -q -t 1

Replace the text "" in the
example with the full URL displayed under "Cron maintenance tasks" on the
"Status report" page.

More information about cron maintenance tasks is available at, and sample cron shell scripts can be found in the
scripts/ directory. (Note that these scripts must be customized like the
above example, to add your site-specific cron key and domain name.)


A new installation of Drupal defaults to a very basic configuration. To extend
your site, you use "modules" and "themes". A module is a plugin that adds
functionality to Drupal, while a theme changes the look of your site. The core
of Drupal provides several optional modules and themes, and you can download
more at and

Do not mix downloaded or custom modules and themes with Drupal's core modules
and themes. Drupal's modules and themes are located in the top-level modules and
themes directories, while the modules and themes you add to Drupal are normally
placed in the sites/all/modules and sites/all/themes directories. If you run a
multisite installation, you can also place modules and themes in the
site-specific directories -- see the Multisite Configuration section, below.

Never edit Drupal's core modules and themes; instead, use the hooks available in
the Drupal API. To modify the behavior of Drupal, develop a module as described
at To modify the look of Drupal, create a
subtheme as described at, or a completely new
theme as described at


A single Drupal installation can host several Drupal-powered sites, each with
its own individual configuration.

Additional site configurations are created in subdirectories within the 'sites'
directory. Each subdirectory must have a 'settings.php' file, which specifies
the configuration settings. The easiest way to create additional sites is to
copy the 'default' directory and modify the 'settings.php' file as appropriate.
The new directory name is constructed from the site's URL. The configuration for could be in 'sites/' (note that 'www.'
should be omitted if users can access your site at

Sites do not have to have a different domain. You can also use subdomains and
subdirectories for Drupal sites. For example,,, and can all be defined as independent Drupal sites. The setup
for a configuration such as this would look like the following:


When searching for a site configuration (for example,
Drupal will search for configuration files in the following order, using the
first configuration it finds:


If you are installing on a non-standard port, the port number is treated as the
deepest subdomain. For example: could be loaded
from sites/ The port number will be removed according to
the pattern above if no port-specific configuration is found, just like a real

Each site configuration can have its own site-specific modules and themes in
addition to those installed in the standard 'modules' and 'themes' directories.
To use site-specific modules or themes, simply create a 'modules' or 'themes'
directory within the site configuration directory. For example, if has a custom theme and a custom module that should not be
accessible to other sites, the setup would look like this:


NOTE: for more information about multiple virtual hosts or the configuration
settings, consult

For more information on configuring Drupal's file system path in a multisite
configuration, see step 6 above.


- See the online documentation:

- For a list of security announcements, see the "Security advisories" page at (available as an RSS feed). This page also
describes how to subscribe to these announcements via e-mail.

- For information about the Drupal security process, or to find out how to
report a potential security issue to the Drupal security team, see the
"Security team" page at

- For information about the wide range of available support options, visit and click on Community and Support in the top or bottom