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 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.