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CHAPTER 1 INTRODUCING DRUPAL
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Once you have these four pieces of information, you can begin to set the database URL. Find the section in settings.php where the database URL is set: * Database URL format: * $db_url = 'mysql://username:password@localhost/database'; * $db_url = 'mysqli://username:password@localhost/database'; * $db_url = 'pgsql://username:password@localhost/database'; */ $db_url = 'mysql://username:password@localhost/database'; Pick the variant that applies to your database. By default, MySQL is given as the suggested example, and all the supported systems are given as examples in the comments. Next, replace username in the URL with the name of the database user, replace password with the database user s password, and replace database with the name of your database. In some cases, if the web server and the database server are running on different machines or have different domains or IP addresses, you will need to replace localhost with the name of the host on which the database is running. With the database URL set, the second task in settings.php is to set the $base_url variable. The $base_url variable is used to make all of the relative paths on your Drupal site into absolute URLs. As such, it is essential for the site to work. The $base_url variable is composed of the domain of your site (http://your.domain.com) plus the path to the subdirectory where you installed Drupal, (/sub/directory). Here is the section of settings.php where $base_url is set: /** * Base URL: * * The URL of your website's main page. It is not allowed to have * a trailing slash; Drupal will add it for you. */ $base_url = 'http://localhost'; The following are some examples of valid $base_url settings: $base_url = 'http://www.somesite.com'; $base_url = 'http://subdomain.othersite.net'; These examples are fine if you installed Drupal directly at the top of the document root. If you installed Drupal in a subdirectory, the $base_url setting will look like this: $base_url= 'http://your.domain.com/sub/directory'; Never add a forward slash at the end. These $base_url values are wrong: $base_url = 'http://your.domain.com/'; $base_url = 'http://your.domain.com/sub/directory/'; // Wrong! // Wrong!
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Accessing the Drupal Site
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To access the Drupal site, open your browser and navigate to the value that you set for the $base_url. If you ve done everything correctly, you ll see the screen shown in Figure 1-1.
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CHAPTER 1 INTRODUCING DRUPAL
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Figure 1-1. Drupal, freshly installed
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The most common problems that people have when installing Drupal include not being able to connect to the database server and an incorrect base URL.
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Unable to Connect to the Database Server
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If you see the message shown in Figure 1-2, you need to review your database configuration and the value that you entered for the database URL. As the message indicates, Drupal is not able to connect to the database server. Here is a list of things to check to solve this problem: Is the database server running Did you create a database for your Drupal site Did you create a database user for the Drupal database Are the username, password, and database name correctly entered for the $db_url variable in the settings.php file If the database server is running on a server other than localhost, is the host entered correctly in the $db_url variable in settings.php Are you using the correct database connection type for your database server MySQL should use mysql://, MySQLi should use mysqli://, and PostgreSQL should use pgsql://.
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CHAPTER 1 INTRODUCING DRUPAL
Figure 1-2. Drupal cannot connect to your database server.
An alternate cause of Drupal not being able to connect to the database is that the version of PHP being used doesn t have the requisite database extension activated. PHP needs special libraries to connect to different database servers from different vendors. To diagnose whether this is preventing the database connection from being made, consult the details of a phpinfo(); page and look for the section corresponding to your database.
Tip
phpinfo() is a PHP function that Outputs lots of PHP information (http://php.net/phpinfo).
It is very useful for assessing whether PHP is installed correctly and whether the appropriate directives and settings to support Drupal are in place. To execute phpinfo(), place a file in your document root named phpinfo.php with the following line: < php phpinfo(); >. Request the file from the server with your browser to see the information.
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