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Clean up log files - http://serverfault.com/questions/185253/delete-all-of-var-log
Clean up log files + more - https://lonesysadmin.net/2013/03/26/preparing-linux-template-vms/
Animated Gif of Traditional Virtualization vs Container - https://leandromoreira.com.br/2016/02/06/from-lxc-to-docker-machine-and-cloudery/