Installation and configuration of Docker

In privious Blog I have mention Docker Introduction. 

I have Installed Docker Ubuntu so below are the steps to installation

•        Docker is supported on the following versions of Ubuntu:
•        Ubuntu Trusty 14.04 (LTS) (64-bit)
•        Ubuntu Precise 12.04 (LTS) (64-bit)
•        Ubuntu Raring 13.04 and Saucy 13.10 (64 bit)

Please read Docker and UFW, if you plan to use UFW (Uncomplicated Firewall)
Ubuntu Trusty 14.04 (LTS) (64-bit)

Ubuntu Trusty comes with a 3.13.0 Linux kernel, and a docker.io package which installs Docker 1.0.1 and all its prerequisites from Ubuntu's repository.
Note: Ubuntu contain a much older KDE3/GNOME2 package called docker, so the Ubuntu-maintained package and executable are named docker.io.

Ubuntu-maintained Package Installation

To install the latest Ubuntu package (this is not the most recent Docker release):
$ sudo apt-get update
$ sudo apt-get install docker.io
Then, to enable tab-completion of Docker commands in BASH, either restart BASH or:
$ source /etc/bash_completion.d/docker.io
Note: Since the Ubuntu package is quite dated at this point, you may want to use the following section to install the most recent release of Docker. If you install the Docker version, you do not need to install docker.io from Ubuntu.

Docker-maintained Package Installation

If you'd like to try the latest version of Docker:
First, check that your APT system can deal with https URLs: the file /usr/lib/apt/methods/https should exist. If it doesn't, you need to install the package apt-transport-https.
[ -e /usr/lib/apt/methods/https ] || {
  apt-get update
  apt-get install apt-transport-https
}
Then, add the Docker repository key to your local keychain.
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
Add the Docker repository to your apt sources list, update and install the lxc-docker package.
You may receive a warning that the package isn't trusted. Answer yes to continue installation.
$ sudo sh -c "echo deb https://get.docker.com/ubuntu docker main\
> /etc/apt/sources.list.d/docker.list"
$ sudo apt-get update
$ sudo apt-get install lxc-docker

Note:
There is also a simple curl script available to help with this process.
$ curl -sSL https://get.docker.com/ubuntu/ | sudo sh

To verify that everything has worked as expected:
same way you can access your container.

$ sudo docker run -i -t Ubuntu /bin/bash
Which should download the Ubuntu image, and then start bash in a container.

RHEL 6 you need to Install EPEL repo and then you need run below mention command 

 yum install docker

In RHEL 7. it's inbuild Package. you don't need to install additional 
Package

NOTE: If you wanted to launch your docker container  then you need to write dockerfile and need to build the docker container.
More Information you can Click here

Docker Introduction

About Docker:
Develop, Ship and Run Any Application, Anywhere

Docker is a platform for developers and sysadmins to develop, ship, and run applications. Docker lets you quickly assemble applications from components and eliminates the friction that can come when shipping code. Docker lets you get your code tested and deployed into production as fast as possible.

Docker consists of:

•     The Docker Engine - lightweight and powerful open source container virtualization technology combined with a work flow for building and containerizing your applications.
•     Docker Hub - SaaS service for sharing and managing your application stacks.

Deployment:

•     Docker containers run (almost) everywhere. You can deploy containers on desktops, physical servers, virtual machines, into data centers, and up to public and private clouds.
•     Since Docker runs on so many platforms, it's easy to move your applications around. You can easily move an application from a testing environment into the cloud and back whenever you need.
•     Docker containers don't need a hypervisor, so you can pack more of them onto your hosts. This means you get more value out of every server and can potentially reduce what you spend on equipment and licenses.
•     As Docker speeds up your work flow, it gets easier to make lots of small changes instead of huge, big bang updates. Smaller changes mean reduced risk and more uptime.