Docker

Two step process:

  1. Set up the Docker repository
  2. Install and update Docker from the repository.

Set up repository

Update the apt package index and install packages to allow apt to use a repository over HTTPS:

$ sudo apt-get update

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

Likely all of the above is already installed.

Add Docker’s official GPG key:

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

Verify that you now have the key with the fingerprint 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88, by searching for the last 8 characters of the fingerprint.

$ sudo apt-key fingerprint 0EBFCD88

pub   rsa4096 2017-02-22 [SCEA]
      9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
uid           [ unknown] Docker Release (CE deb) <docker@docker.com>
sub   rsa4096 2017-02-22 [S]

Now add the repository:

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

Install Docker Engine

Update the apt package index, and install the latest version of Docker Engine and containerd

 $ sudo apt-get update
 $ sudo apt-get install docker-ce docker-ce-cli containerd.io

Verify Installation:

$ sudo docker run hello-world

Run Docker without sudo

As installed above all Docker commands need to be prefixed with sudo. Let's change this as follows:

  • Create a group, call it docker.
$ sudo groupadd docker
  • Add your user to the docker group.
$ sudo usermod -aG docker $USER
  • Run the following command to activate the changes to groups:
$ newgrp docker
  • Verify that you can run docker commands without sudo.
$ docker run hello-world