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Docker Installation

docker-series , docker

Update your packages list:

sudo apt update

Then install required packages that let apt use package over HTTPS:

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

Then add the GPG key for the official Docker repository:

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

Then add the Docker repository to APT sources:

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

Update the package database:

sudo apt update

Before install Docker. make sure the installation source is from the Docker repository instead of the Ubuntu repository:

apt-cache policy docker-ce

The output would be like this, the version number of Docker may be different:

docker-ce:
  Installed: (none)
  Candidate: 5:19.03.9~3-0~ubuntu-focal
  Version table:
     5:19.03.9~3-0~ubuntu-focal 500
        500 https://download.docker.com/linux/ubuntu focal/stable amd64 Packages

The Docker status is not installed, but the installation candidate is from the Docker repository for Ubuntu 20.04.

Install the docker

sudo apt install docker-ce

Once installed, the daemon will be started and the process enabled on the boot. Check that it’s running:

sudo systemctl status docker

The output will show that the service is active and running.