How To Install Docker on Ubuntu 16.04

What is Docker?

Docker is an application that makes it simple and easy to run application processes in a container, which are like virtual machines.

What is a Container?

Containers are a way to package software in a format that can run isolated on a shared operating system. Unlike VMs, containers do not bundle a full operating system - only libraries and settings required to make the software work are needed. This makes for efficient, lightweight, self-contained systems and guarantees that software will always run the same, regardless of where it’s deployed.

Prerequisites

To follow this tutorial, you will need the following:

• 64-bit Ubuntu 16.04 server

Installing Docker

To install docker from official docker repository, add the GPG key for the official Docker repository to the system:

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - 

Add the Docker repository to APT sources:

$ sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable”

Next, update the package database with the Docker packages from the newly added repo:

$ sudo apt-get update

Now, install Docker:

$ sudo apt-get install -y docker-ce

Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running:

$ sudo systemctl status docker

The output should be similar to the following, showing that the service is active and running:
docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Active: active (running) since Sun 2016-05-01 06:53:52 CDT; 1 weeks 3 days ago Docs: https://docs.docker.com Main PID: 749 (docker)

Docker Command

With Docker installed and working, now’s the time to become familiar with the command line utility. Using docker consists of passing it a chain of options and commands followed by arguments. The syntax takes this form:

$ sudo docker [option] [command] [arguments]

To view all available subcommands, type:

$ sudo docker

You will see the output as follows:

attach    Attach to a running container
build     Build an image from a Dockerfile
commit    Create a new image from a container's changes
cp        Copy files/folders between a container and the local filesystem
create    Create a new container
diff      Inspect changes on a container's filesystem
events    Get real time events from the server
exec      Run a command in a running container
export    Export a container's filesystem as a tar archive
history   Show the history of an image
images    List images
import    Import the contents from a tarball to create a filesystem image
info      Display system-wide information
inspect   Return low-level information on a container or image
kill      Kill a running container
load      Load an image from a tar archive or STDIN
login     Log in to a Docker registry
logout    Log out from a Docker registry
logs      Fetch the logs of a container
network   Manage Docker networks
pause     Pause all processes within a container
port      List port mappings or a specific mapping for the CONTAINER
ps        List containers
pull      Pull an image or a repository from a registry
push      Push an image or a repository to a registry
rename    Rename a container
restart   Restart a container
rm        Remove one or more containers
rmi       Remove one or more images
run       Run a command in a new container
save      Save one or more images to a tar archive
search    Search the Docker Hub for images
start     Start one or more stopped containers
stats     Display a live stream of container(s) resource usage statistics
stop      Stop a running container
tag       Tag an image into a repository
top       Display the running processes of a container
unpause   Unpause all processes within a container
update    Update configuration of one or more containers
version   Show the Docker version information
volume    Manage Docker volumes
wait      Block until a container stops, then print its exit code

To view the information of sub commands use foollowing command:

$ docker docker-subcommand --help

Thank you.