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Users/Docker_Image.rst: Fix copyright violation #494

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38 changes: 23 additions & 15 deletions Users/Docker_Image.rst
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What is Docker?
===============

Docker is a tool designed to make it easier to create, deploy, and run
applications by using containers. Containers allow a developer to package
up an application with all of the parts it needs, like libraries and other
dependencies, and ship it all out as a single package.

With the help of containers, the developer can rest assured that
the application will run on other machines regardless of any
customized settings his machine might have that could differ from the
machine used for writing and testing the code.

Unlike a virtual machine, rather than creating a whole virtual operating
system, Docker allows applications to use the same kernel as the system
that they're running on and only requires applications being shipped
with things not already running on the host computer. This gives a
significant performance boost and reduces the size of the application.
Docker is a tool designed to make it easier to create, deploy, and run
applications by using containers. Containers allow a developer to package
up an application with all of the parts it needs, such as libraries and other
dependencies, and ship it all out as one package. By doing so, thanks to the
container, the developer can rest assured that the application will run
on any other Linux machine regardless of any customized settings that
machine might have that could differ from the machine used for writing
and testing the code.

In a way, Docker is a bit like a virtual machine. But unlike a virtual
machine, rather than creating a whole virtual operating system, Docker
allows applications to use the same Linux kernel as the system that
they're running on and only requires applications be shipped with things
not already running on the host computer. This gives a significant
performance boost and reduces the size of the application.

Cited from `opensource.com <https://opensource.com/resources/what-docker>`__.

What is Docker? is licensed under a
Creative Commons Attribution-ShareAlike 4.0 International License

Refer to `CC-BY-SA-4.0 <https://creativecommons.org/2014/01/07/plaintext-versions-of-creative-commons-4-0-licenses/>`__
for more information.

What is a Docker Image and how is it different from a container?
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