Linux for sysadmins -- Installing SquidGuard & Squid proxy server on CentOS 7
The combination of Squid and SquidGuard is one that most businesses should consider. It allows you to reduce Internet bandwidth usage, monitor usage, increase speed and responsiveness to the users, and filter unwanted sites and content easily but at as fine a grained level as you need for your application. CentOS is a great choice to host this combo and the whole system runs well on everything from virtual machines, to last year's upcycled desktop PC, to high end dedicated server hardware.
In smaller shops I've often taken desktop PC's that were pulled when new PC upgrade cycles were complete, maxed out their RAM, and added a quality hard drive and an external storage solution, like a RAID enclosure, or simple external SATA drive. Throw it all on a UPS and keep some cold spares handy from the rest of the old PC's and away you go.
I've even run this at home at times when I lived in locations with slow and or metered Internet access.
http://linuxtechlab.com/install-squidguard-with-squid-proxy-server-complete-guide/
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