Varnish Cache is a web application accelerator, that sit in between visors and web server. It caches frequently requested pages and serve them from memory. Varnish is Open Source software, you can download it from https://www.varnish-cache.org/ Varnish work as reverse
When installing Varnish Cache on CentOS 6.5 server, i got following error. This is fixed by enabling EPEL repository. Now install varnish with command It will work now.
Varnish is a HTTP accelerator, build from ground up with performance in mind. Varnish is targeted primarily at the FreeBSD 6/7 and Linux 2.6 platforms, and will take full advantage of the virtual memory system and advanced I/O features offered
WordPress.com use Amazon S3 for storing images, they do not serve images directly from Amazon, they use Varnish reverse proxy at front end, so not all images need to be served from S3, Varnish cache popular images and serve directly
Many large web sites use reverse proxy servers in front end. For example flicker use squid in reverse proxy mode, wordpress use varnish in front end. Varnish was written from the ground up to be a high performance caching reverse
