Varnishtuner.py is a script you can run on your server to get advice on what you could possibly change to make your Varnish caching more efficient. The script is available for download.
Instead of increasing your hardware fleet to several folds your current needed capacity for the sole purpose of absorbing search engine traffic, you can leverage a dirt-cheap high-density RAM server to cache as much of your content on a separate server where all bot traffic will be “trapped.”
This new release is sporting new features and several bug fixes. Notably the Always Up feature. cPanel’s webmail and WHM redirection and/or proxying has been fixed. cPanel’s new Paper Lanter theme has been implemented. Varnish has been upgraded to the latest.
Always Up is a new feature in the cPanel Varnish Plugin starting from version 2.4.0. This feature addresses a serious issue that affects most busy Web servers especially at times when one could be unavailable or away from their desk.