Killer open source admin tools

From systems automation and monitoring, to backups and data center management, open source has the tools to make sysadmins’ jobs easier. Need to make configs simpler so that you can hand off some tasks to a junior admin? Want to automate more of your routine tasks to save more of your time? Maybe you just need a better way to view what’s happening on your servers or on the network? Whatever your situation, here are some killer open source admin tools that will help you get the job done faster and easier.