How to Install Docker on Ubuntu 14.04 LTS Print

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Introduction

Docker is a container-based software framework for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules. The major (intended) benefit of using a container is that your application will run consistently on and between any server, be it cloud or dedicated, or of varying operating systems.

 
Installation

First, you’ll follow a simple best practice: ensuring the list of available packages is up to date before installing anything new.

apt-get update


Let’s install Docker by installing the docker-io package:

apt-get -y install docker.io


Link and fix paths with the following two commands:

ln -sf /usr/bin/docker.io /usr/local/bin/docker
sed -i '$acomplete -F _docker docker' /etc/bash_completion.d/docker.io


Finally, and optionally, let’s configure Docker to start when the server boots:

update-rc.d docker.io defaults


Download a Docker Container

Let’s begin using Docker! Download the fedora Docker image:

docker pull ubuntu


Run a Docker Container

Now, to setup a basic ubuntu container with a bash shell, we just run one command. docker run will run a command in a new container, -i attaches stdin and stdout, -t allocates a tty, and we’re using the standard ubuntu container.

docker run -i -t ubuntu /bin/bash


That’s it! You’re now using a bash shell inside of a ubuntu docker container.

To disconnect, or detach, from the shell without exiting use the escape sequence Ctrl-p + Ctrl-q.

There are many community containers already available, which can be found through a search. In the command below I am searching for the keyword debian:

docker search debian


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