Setting Up Docker on Ubuntu 20.04 Focal (Arm64) Oracle Cloud

Installing Docker

First add the required dependencies and the security key:

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

Add Docker’s official GPG key:

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

Add the Docker repository corresponding to your CPU architecture and Operating System version (arch=arm64):

sudo add-apt-repository “deb [arch=arm64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable”

Finally update the repository sources:

sudo apt-get update

Also guarantee that you are about to install from the official Docker repository, instead of the default Ubuntu repo:

apt-cache policy docker-ce

Then install Docker:

sudo apt-get -y install docker-ce

Check version

sudo docker -v

Add your user to docker group:

sudo usermod -aG docker ${USER}

So that this change takes effect you have log out and log in again.

Installing Docker Compose

First install the Python package manager:

sudo apt install python3-pip

Then install Docker Compose:

sudo pip3 install docker-compose

Check version

sudo docker-compose --version

Source: https://blog.rylander.io/2020/12/23/setting-up-docker-on-ubuntu-20-04-focal-arm64/