Installing Docker in Ubuntu

Set up repository to install dependent package for Docker installation

 sudo apt-get update  

Install packages to allow apt to use a repository over HTTPS:

  sudo apt-get install \  
   apt-transport-https \  
   ca-certificates \  
   curl \  
   software-properties-common  

Add Docker’s official GPG key:

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

To Verify the key with the fingerprint by matching the last 8 characters of the fingerprint.

 sudo apt-key fingerprint 0EBFCD88  

Set up the stable repository I have chosen stable repository and x86_64/amd64. For different version please follow the link

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

Now to install Docker
Update the apt package index

 sudo apt-get update  

Install the latest version of Docker CE

 sudo apt-get install docker-ce  

To verify that Docker CE is installed correctly by running the hello-world image

 sudo docker run hello-world  

It will download a test image and run it in a container. When the container runs, it prints an informational message and exits. Now Docker CE is installed and running on your machine.

If you need to uninstall Docker installed

 sudo apt-get purge docker-ce  

To delete all images, containers, and volumes which is not removed automatically

 sudo rm -rf /var/lib/docker  

If you want to configure Linux as post installation Click the Link. Some Useful Commands: To see list of images downloaded image on your machine.

 docker image ls  

To get help

 docker container --help  

Next Define your own container with Docker file

Helpful links
https://docs.docker.com/get-started/#conclusion-of-part-one
https://github.com/docker/labs/tree/master/beginner/