Installing Docker and Docker Compose on Elementary Os Juno

What is Docker?

Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.

What is a Container?

A container allows developers to package up everything needed to run an application: code, runtime, system tools, system libraries and settings.

Installing Docker

You can install docker from apt, but it will not be the latest release. If you have docker installed through apt-get uninstall them.

$ sudo apt remove docker docker-engine docker.io containerd runc

The contents of /var/lib/docker/, including existing images, containers, volumes are preserved.

Install using the repository

1. Add Docker's official GPG key:

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

2. Add the stable repo.

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

3. Update the apt package index and install the latest version of Docker Engine.

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

4. Smoke test, it should download an image and print informational messages and exit.

$ sudo docker run hello-world

5. Installing Docker Compose

$ sudo curl -L "https://github.com/docker/compose/releases/download/1.24.1/docker-compose-linux-x86_64" -o /usr/local/bin/docker-compose

6. Permit the binary to be run

$ sudo chmo +x /usr/local/bin/docker-compose

Optional Steps

Run docker without using sudo

$ sudo usermod -aG docker $USER

You must log out and log in back for this to take effect.