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The Docker Book by James Turnbull

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1 Introduction

Containers have a long and storied history in computing. Unlike hypervisor virtualization, where one or more independent machines run virtually on physical hardware via an intermediation layer, containers instead run in user space on top of an operating system’s kernel. As a result, container virtualization is often called operating system-level virtualization. Container technology allows multiple isolated user space instances to be run on a single host.

As a result of their status as guests of the operating system, containers are sometimes seen as less flexible: they can generally only run the same or a similar guest operating system as the underlying host. For example, you can run Red Hat Enterprise Linux on an Ubuntu server, ...

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