Moving your default DocRoot
If you want to change your default DocumentRoot path, there are at least two things you need to update.
The DocumentRoot directive
The <Directory> block associated with the DocRoot.
As each DocumentRoot needs a matching <Directory> block, be sure to update both to reflect the new location. If you only change the DocumentRoot path, you will get a 403 Forbidden error in your browser.
Example Old Configuration
For example, your old config may have looked something like this:
... DocumentRoot /usr/local/apache2/htdocs <Directory /usr/local/apache2/htdocs> AllowOverride None Options None Order allow,deny Allow from all </Directory> ...
Example New Configuration
Now let's say you want to move the DocRoot to /var/www; you will need to update both of them.
... DocumentRoot /var/www <Directory /var/www> AllowOverride None Options None Order allow,deny Allow from all </Directory> ...
These steps not only apply to the main server config, but also any VirtualHosts you want to change.