How To Install Docker on Ubuntu 14.04

Install Docker on Ubuntu 14.04

In this tutorial, we will show you how to install Docker on Ubuntu 14.04. For those of you who didn’t know, Docker is an open-source tool that makes creating and managing Linux containers (LXC) easy. With Docker, the applications reside inside the container on top of the Linux operating system. Docker uses Kernel features such as groups and namespace to allow the independent containers to run on a single os instance.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you through the step-by-step installation of Docker on Ubuntu 14.04.

Install Docker on Ubuntu 14.04

Step 1. First of all, make sure that all packages are up to date.

apt-get update
apt-get upgrade

Step 2. Install Docker using the apt-get command.

apt-get install docker.io

Start and enable Docker service:

service docker.io status
service docker.io start

Create a symlink to the Docker executable so that the Docker documentation commands can be executed without changing the path. This is required because the Ubuntu package for Docker is installed to a different directory to the default Docker recommendation:

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

Step 3. Download a Docker Container.

Let’s begin using Docker, Download the ubuntu Docker image:

docker pull ubuntu

Step 4. Run a Docker Container.

As we can see ubuntu container has been started and we got the bash shell. In the docker command, we have used options like ‘-i attaches stdin and stdout’ and ‘-t allocates a terminal or console’. Once you exit the shell, the Docker image will be switched off.

docker run -i -t ubuntu /bin/bash

Alternatively, you may want to launch a specific version of Ubuntu: a container that can contain multiple images. This command shows the available images that you have downloaded so far:

sudo docker.io images
REPOSITORY          TAG                 IMAGE ID
ubuntu              vivid               76ca2fd90787
ubuntu              15.04               76ca2fd90787
ubuntu              utopic              cfaba6b5fefe
ubuntu              14.10               cfaba6b5fefe
ubuntu              14.04               5ba9dab47459
ubuntu              trusty              5ba9dab47459
ubuntu              14.04.1             5ba9dab47459
ubuntu              latest              5ba9dab47459
ubuntu              12.04.5             69c02692b0c1

Now if you want to launch another version, you can simply prepend the TAG of the version you want to launch to the container in this way:

sudo docker.io run -i -t ubuntu:14.10 /bin/bash

Congratulations! You have successfully installed Docker. Thanks for using this tutorial for installing Docker on Ubuntu 14.04 system. For additional help or useful information, we recommend you check the official Docker website.

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