Make Drupal Successfully Running At Sub-directory

Practical tips to get Drupal 7 running from a sub-directory.

While my Web-server I’am using is Apache, I was able to modify the .htacess files to make it works.

2 .htacess files we need to modify and/or creates if not exist.

First .htacess file which placed into the Document-Root directory (ie. /home/website/public_html directory).

# we will consider drupal sub-directory name is "drupal"
RewriteEngine on
RewriteRule ^$ drupal/index.php [L]
RewriteCond %{DOCUMENT_ROOT}/drupal%{REQUEST_URI} -f
RewriteRule .* drupal/$0 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* drupal/index.php?q=$0 [QSA]

Second .htacess file which placed into the sub-directory (which contain Drupal installation – ie /home/website/public_html/drupal).

  # Modify the RewriteBase if you are using Drupal in a subdirectory or in a
  # VirtualDocumentRoot and the rewrite rules are not working properly.
  # For example if your site is at http://example.com/drupal uncomment and
  # modify the following line:
  RewriteBase /drupal
  #
  # If your site is running in a VirtualDocumentRoot at http://example.com/,
  # uncomment the following line:
  # RewriteBase /

Clean url must now works fine, also if we need to redirect to non-www we can add Rewrite-rule that provided with Drupal to the Document-Root .htaccess

# we will consider drupal sub-directory name is "drupal"
RewriteEngine on

# To redirect all users to access the site WITHOUT the 'www.' prefix
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^ http%{ENV:protossl}://%1%{REQUEST_URI} [L,R=301]

RewriteRule ^$ drupal/index.php [L]
RewriteCond %{DOCUMENT_ROOT}/drupal%{REQUEST_URI} -f
RewriteRule .* drupal/$0 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* drupal/index.php?q=$0 [QSA]

Hope That helps,

All best wishes.