To install on a Fedora-based distro (RHEL, CentOS, etc.) there are two main options:
- Install from the repository through a
yum install drupal command.
- Install it yourself.
The installation instructions will vary a bit depending on your choice, as will the version you wind up with in some cases.
To be compliant with FHS guidelines on architecture independent system components (http://www.pathname.com/fhs/pub/fhs-2.3.html#THEUSRHIERARCHY) vs transient data placement (http://www.pathname.com/fhs/pub/fhs-2.3.html#THEVARHIERARCHY) and to enforce Fedora-ish system segregation Fedora and its derivatives place the code part of systems like Drupal and WikiMedia in /usr/share and the data elements (like files/ and images/) in /var/www. These parts are bound together through a series of symlinks, as the original development concept behind Drupal and other such systems did not take the FHS into account (there is a pretty big generation/culture gap between core Unix developers and web developers -- and embedding code to this extent inside of what used to be public data files (.html files becoming .php files and totally bypassing cgi-bin) was never thought of when the FHS was originally conceived). This can be confusing for newcomers.