From Docker in Action, Second Edition by Jeff Nickoloff and Stephen Kuenzli

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Even small applications have dozens of components. Large applications may have thousands, which makes them challenging to install, maintain, and remove. Docker bundles all application components into a package called a container that keeps things tidy and helps manage any dependencies on other applications or infrastructure. Used by everyone from small start-ups to eBay and Lyft, Docker has changed development for the better. If you’re looking to join the container revolution, Docker in Action, Second Edition will get you started. Check out the slide deck below for more info.