How to Install?

How to install?

This process will help you to guide you to install docker on a Ubuntu machine.

Install Docker from Ubuntu Repository

You can use apt-get command to install the Docker from Ubuntu base repository.

$ sudo apt install docker.io

Start the docker service and enable it to start automatically on system startup.

$ sudo systemctl start docker
$ sudo systemctl enable docker

Now, verify the docker version.

$ docker --version
$ Docker version 17.12.1-ce, build 7390fc6

Install Docker from Official Docker Repository

Prerequisites

Uninstall the older versions of Docker package, named docker or docker-engine or docker.io along with associated dependencies.

If the system does not have Docker packages, skip the below step.

sudo apt -y remove docker docker-engine docker.io

Contents such as images, volumes, and networks under /var/lib/docker/ are preserved.

Setup

Setup docker, open terminal and execute:

sudo apt update

Install the below packages to ensure the apt work with https method, and CA certificates are installed.

sudo apt install -y apt-transport-https software-properties-common ca-certificates curl wget

Add the GPG key for Docker repository on your system.

wget https://download.docker.com/linux/ubuntu/gpg 
sudo apt-key add gpg

Now, add the official Docker repository by running the below command in the terminal.

echo "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable" | sudo tee /etc/apt/sources.list.d/docker.list

Update the apt database.

sudo apt update

Make sure you are installing the docker package from the official repository.

sudo apt-cache policy docker-ce

Output:

docker-ce:
  Installed: (none)
  Candidate: 18.03.1~ce~3-0~ubuntu
  Version table:
     18.03.1~ce~3-0~ubuntu 500
        500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages

More info: https://docs.docker.com/v17.09/engine/installation/linux/docker-ce/ubuntu/#install-docker-ce-1

Mac OS

Open a terminal an execute the following command:

brew cask install docker

Then launch the Docker app. Click next. It will ask for privileged access. Confirm. A whale icon should appear in the top bar. Click it and wait for "Docker is running" to appear.

You should be able to rundockercommands now.

docker ps