Get to know Docker, container technology out of the box
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Container-based virtualization isolates applications from each other on a shared operating system (OS). This approach standardizes application program delivery, allowing apps to run in any Linux environment, whether physical or virtual. Because they share the same operating system, containers are portable among different Linux distributions and are significantly smaller than virtual machine (VM) images.
Solomon Hykes, CTO and founder of dotCloud, has posted a video tutorial for Docker.