Containers, virtual machines, or bare metal?: 
Which technology will you use to deploy your next big application?
The data center is changing. Again. In the olden days, really not all that many years ago, pretty much every server that sat on a rack in a data center was fairly straightforward (if you could call it that). Each machine ran a single operating system, and often many programs, each requiring their own updates, upgrades, and patches. It was, putting it nicely, a hard situation to maintain, though many management tools emerged to help administrators keep all of their machines safe, secure, and up-to-date.
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Opensource.com – Jason Baker
Supporting Open Source.