Install and Use Docker on Ubuntu 22.04

Step 1 — Installing Docker

  1. First, update your system by running
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sudo apt update && sudo apt upgrade -y
  1. Next, install a few prerequisite packages which let apt use packages over HTTPS:
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sudo apt install apt-transport-https ca-certificates curl software-properties-common
  1. Then add the GPG key for the official Docker repository to your system:
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curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
  1. Add the Docker repository to APT sources:
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echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
  1. Update your existing list of packages again for the addition to be recognized:
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sudo apt update
  1. Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:
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apt-cache policy docker-ce
  1. Finally, install Docker:
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sudo apt install docker-ce
  1. Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running:
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sudo systemctl status docker

Step 2 — Working with Docker Images

  1. To check whether you can access and download images from Docker Hub, type:
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docker run hello-world
  1. You can search for images available on Docker Hub by using the docker command with the search subcommand. For example, to search for the Ubuntu image, type:
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docker search ubuntu
  1. Execute the following command to download the official ubuntu image to your computer:
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docker pull ubuntu
  1. To see the images that have been downloaded to your computer, type:
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docker images

Step 3 — Running a Docker Container