Installation on Ubuntu 14.04

Reference

Prerequisites

Docker requires a 64-bit installation regardless of your Ubuntu version. Additionally, your kernel must be 3.10 at minimum.

$ uname -r
3.11.0-15-generic

Update your apt sources

1. Update package information, ensure that APT works with the https method, and that CA certificates are installed.

   $ sudo apt-get update
   $ sudo apt-get install apt-transport-https ca-certificates
   

2. Add the new GPG key.

   $ sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
   

3. Edit /etc/apt/sources.list.d/docker.list. Remove any existing entries. Add

   # for ubuntu 14.04
   deb https://apt.dockerproject.org/repo ubuntu-trusty main
   

4. Purge the old repo if it exists.

   $ sudo apt-get update
   $ sudo apt-get purge lxc-docker
   $ apt-cache policy docker-engine
   

5. Install the recommended packages.

   $ sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
   

6. Install docker

   $ sudo apt-get install docker-engine
   

7. Verify docker is installed correctly

   $ sudo docker run hello-world