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In this demo, we will install Docker on Ubuntu 16.04 or Ubuntu Xenial.

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Let's start off with running a standard 'apt-get update' command.

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Once we are done with that,

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let's install some of the prerequisites,

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such as 'apt-transport-https', to make

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sure that our machine can communicate through HTTPS,

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authority certificates, curl and software-properties-common,

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which contains some of the Golang objects which will be used by Docker.

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And the installation is successful.

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Now let's download GPG Key for Docker and add it to our machine.

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And to make sure that we don't get a long list of processes

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which happen in the background,

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let's use '-fsSL' flag to keep our result as small as OK.

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And it shows OK, which means we got our gpg key.

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Let's verify this key using 'sudo apt-key fingerprint' command.

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We can verify that we have received the correct key by searching

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for the last eight characters of the fingerprint, which should

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be '0EBF CD88'.

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This information is provided by Docker itself,

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so there is not much for you to figure out.

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And yes, our key does have those characters as its last 8 digits.

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Now, run this command to add a repository called stable

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and add the content of 'download.docker.com/linux/ubuntu' on it.

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We have provided the flag 'lsb_release -cs'

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to make sure that Docker provides correct files, which means files

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for Ubuntu Xenial or Ubuntu 16.4 to our stable repository.

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Let's run the update again to reflect the changes.

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Run 'sudo apt-get install docker-ce' to finally install Docker

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'-ce' stands for Community Edition, which is one of

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the two editions provided by Docker.

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The other one is called the Enterprise Edition, which is

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not free, so we won't be including it in this course.

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The process has ended and we have successfully installed

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docker-ce or Docker Community Edition.

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Verify that our installation is successful,

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by running 'sudo docker run hello-world' Command.

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This will run a container called hello-world, which would

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only be possible if the Docker installation was successful.

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You don't have to pay much attention to the processes which

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are going on, because we will be exploring all of them

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in sufficient depth in further modules.

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As it says, our installation appears to be working correctly.

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You may have noticed that we have been using root privileges

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over and over, to make sure that you can run Docker from your

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regular user as well.

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Let's perform a few more steps.

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First, let's add a group called docker using 'sudo groupadd docker'.

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Now let's add a user which is dhwani to this docker group

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and provide it root privileges.

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Now let's try to run a hello-world container without root

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privileges with just docker run hello-world command

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and we get the same results.