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Using a configuration management tool is one of the most impactful ways to have dramatically faster, cheaper, more stable systems.
If you're not using one already, this book will give you a good taste of each of the most popular tools.
If you're using a tool and aren't completely happy with it, then this will give you a good introduction to the other available tools.
Either way, this book can save you weeks of effort and research. If you value your time, it's a great investment.
New in the 2nd Edition: