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[MUSIC]

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Hi, I'm Jay McGavren, and

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I'm here to present a course written
by our guest author, Jared Smith.

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Welcome to introduction to Docker.

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We put this course together for you so we
can take a deep dive into what Docker is,

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why it matters, and how to use it for
you own software projects.

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Have you ever taken another developers app
and tried to run it on your machine, and

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have it fail terribly with weird errors?

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All to often you'll be told, it works on
my machine so it should work on yours.

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If you've ever had this happen,
then Docker is the tool for you.

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Docker bundles your app together
with all the libraries and

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services it depends on into
a package called a container,

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which can then be delivered as
a single unit wherever it needs to go.

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It's kind of like a shipping container.

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Because shipping containers
are all the same shape,

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they can all be handled the same way
regardless of what they contain, likewise,

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no matter what your apps'
architecture looks like.

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Funneling it into a Docker container
allows your coworkers or customers to

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deploy it anywhere without worrying
about what its components look like.

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Rather than worrying about
how software should be built

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every time it changes hands between
developers or operation staff,

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Docker standardizes how an app is built
through a simple configuration file.

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Docker allows apps to be quickly and
easily run on Windows, Mac, or

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Linux hosts.

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The growing DevOps movement integrates
the jobs of developers with the operation

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staff, who have to run their
applications day to day.

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Docker is one of
the essential DevOps tools.

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DevOps is a very broad topic, and
we won't discuss it much here.

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But one of its key tenets is that
we should prefer working systems

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over comprehensive documentation.

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Docker enables this by
standardizing how systems run.

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And making it possible
to deploy complex apps

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without relying on
extensive documentation.

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Companies like Facebook,
Netflix, Google, and

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GitHub, all use Docker on a daily basis.

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Before we start on the course,
let's make sure we're on the same page.

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We're assuming you've got Docker
installed on your computer.

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If not, check the teacher's notes for
links to help you get started.

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This course assumes you've gone
through all the prerequisites

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listed on the course page.

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You need to already be familiar with
running Shell commands from your terminal.

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If you're not comfortable with that,
do yourself a favor and

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review the prerequisites
before starting this course.

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We've also included links to helpful
resources in the teacher's notes

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throughout the course.

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If at any point,

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you encounter something you don't
understand, check the teacher's notes.

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The solution is probably there.

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We tried to adjust the pace of this
material to accommodate everyone.

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But depending on what you know,
it's probably going to be too slow for

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you in some places and too fast in others.

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You can adjust the video playback
speed faster or slower as needed for

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the current section.

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Don't worry about memorizing every detail
about every command you see in this

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course, that will be summarized
in the teacher's notes.

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The important part is that you remember
the general purpose of each command and

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how it works.

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Okay, ready?

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We'll be running a darker
container in the next video.