Site Under Maintenance Page
In apache config file make sure,
RewriteEngine On
Then add the following lines somewhere (usually within the appropriate virtual host container),
RewriteCond %{DOCUMENT_ROOT}/maintenance.html -f
RewriteCond %{REQUEST_FILENAME} !/maintenance.html
RewriteCond %{REQUEST_FILENAME} !/logo.jpg
RewriteCond %{REQUEST_FILENAME} !/loading.gif
RewriteRule ^.*$ /maintenance.html [L]
Then inside the root of the virtual host's directory, add the above files called for your maintenance page.
When you want to turn the page ON, simply make sure the maintenance.html file is there.
To turn the page OFF, simply rename the maintenance.html file to maintenance.html.REMOVE
