To have a single instance of apache serve two domain names (with separate web pages) use virtual hosts:

<VirtualHost *>
...
ServerName www.thayersfarm.com
ServerAlias thayersfarm.com *.thayersfarm.com 
DocumentRoot /var/www/thayersfarm/
...
</VirtualHost>

<VirtualHost *>
...
ServerName www.carmarthenshirehistorian.org
ServerAlias carmarthenshirehistorian.org *.carmarthenshirehistorian.org
DocumentRoot /var/www/historian/
...
</VirtualHost>

Unable to load Gallery images

Problem
galleryadd.pl failed to load certain images. Unfortunately none of the default logging highlighted the problem, until I added some logging in gallery_remote2.php:

case 'add-item':
                $chris_error = $_FILES['userfile']['error'];  
                echo "File upload error: $chris_error\n";
                gr_add_item( $gallery, $response, $_FILES['userfile']['tmp_name'], $_FILES['userfile']['name'],
getRequestVar('caption'), getRequestVar('force_filename'), getRequestVar('auto_rotate') );

This printed the error code for the uploaded file: 1, UPLOAD_ERR_INI_SIZE (codes found here).

Solution
Increase the default allowable file size, upload_max_filesize in php.ini, from 2M to 10M

Restart apache.
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