In this article we are going to cover How to Install Docker on Ubuntu 22.04 LTS

What is Docker ?

Docker is a software containerization platform that packages your application, all its libraries and configuration files in the form of a docker container where you can develop, ship and execute the applications.

In addition to it, Docker provides a robust client-server application architecture with a powerful server, REST API and command-line interface client. You can use the same infrastructure to run more containers and utilize fewer resources.

Docker can be installed on any operating system, it can be Mac, Windows, Linux and even cloud. It works only on 64 bit Linux installation and needs a Linux kernel of 3.10 and a higher version

Prerequisites

  • Ubuntu 22.04 LTS Installed
  • A user account with sudo privileges (to execute administrative commands).

Step #1:Update System Packages on Ubuntu 22.04 LTS

Update the APT package index on Ubuntu 22.04 LTS

ubuntu@Rushi-InfoTech:~$ sudo apt-get update

OR

sudo apt update

Install required dependencies packages for docker

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

Step #2:Add GPG key for the official Docker repository in Ubuntu

Add the Docker GPG key to ensure the packages are valid:

ubuntu@Rushi-InfoTech:~$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Step #3:Add the Docker repository to Ubuntu APT sources

Add the Docker repository to your APT sources:

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

If Ubuntu 22.04 LTS has a different codename, replace $(lsb_release -cs) with the appropriate codename.

Update the package index again:

sudo apt update

Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:

apt-cache policy docker-ce

Output:

docker-ce:
  Installed: (none)
  Candidate: 5:20.10.14~3-0~ubuntu-jammy
  Version table:
     5:20.10.14~3-0~ubuntu-jammy 500
        500 https://download.docker.com/linux/ubuntu jammy/stable amd64 Packages
     5:20.10.13~3-0~ubuntu-jammy 500
        500 https://download.docker.com/linux/ubuntu jammy/stable amd64 Packages

Notice that docker-ce is not installed, but the candidate for installation is from the Docker repository for Ubuntu 22.04 (jammy).

Finally, install Docker:

Step #4:Install Docker on Ubuntu 22.04 LTS

Install docker on Ubuntu 22.04 LTS using below command

sudo apt install -y docker-ce docker-ce-cli containerd.io

To check Docker service status if it installed and running

sudo systemctl status docker

Output:

docker.service - Docker Application Container Engine
     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2022-04-01 21:30:25 UTC; 22s ago
TriggeredBy: ● docker.socket
       Docs: https://docs.docker.com
   Main PID: 7854 (dockerd)
      Tasks: 7
     Memory: 38.3M
        CPU: 340ms
     CGroup: /system.slice/docker.service
             └─7854 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

To start/stop/restart the Docker service and enable it to start on boot using sysemctl

sudo systemctl start docker
sudo systemctl stop docker
sudo systemctl restart docker
sudo systemctl enable docker

Verify the installation of Docker on Ubuntu server.

ubuntu@Rushi-InfoTech:~$ docker --version

Step #5:Running Docker commands without sudo

By default, the docker command can only be run the root user in the docker group, which is automatically created during Docker’s installation process. If you attempt to run the docker command without prefixing it with sudo or without being in the docker group, you’ll get an output like this:

docker

Output:

If you want to avoid typing sudo whenever you run the docker command, add your username to the docker group:

sudo usermod -aG docker ${USER}

To apply the new group membership, log out of the server and back in, or type the following:

su - ${USER}

You will be prompted to enter your user’s password to continue.

Confirm that your user is now added to the docker group by typing:

groups

output:

sudo docker

If you need to add a user to the docker group that you’re not logged in as, declare that username explicitly using:

sudo usermod -aG docker username

The rest of this article assumes you are running the docker command as a user in the docker group. If you choose not to, please prepend the commands with sudo.

Step #6:Docker Command-Line

Before moving to Docker Images, Let’s see Docker commands. Before are docker command syntax.

ubuntu@Rushi-InfoTech:~$ docker [option] [command] [arguments]
  • Run docker command to view all available sub commads.
ubuntu@Rushi-InfoTech:~$ docker

Commands:

ubuntu@Rushi-InfoTech:~$ docker

Usage:  docker [OPTIONS] COMMAND

Commands:
  attach      Attach local standard input, output, and error streams to a running container
  commit      Create a new image from a container's changes
  cp          Copy files/folders between a container and the local filesystem
  create      Create a new container
  diff        Inspect changes to files or directories on a container's filesystem
  events      Get real time events from the server
  export      Export a container's filesystem as a tar archive
  history     Show the history of an image
  import      Import the contents from a tarball to create a filesystem image
  inspect     Return low-level information on Docker objects
  kill        Kill one or more running containers
  load        Load an image from a tar archive or STDIN
  logs        Fetch the logs of a container
  pause       Pause all processes within one or more containers
  port        List port mappings or a specific mapping for the container
  rename      Rename a container
  restart     Restart one or more containers
  rm          Remove one or more containers
  rmi         Remove one or more images
  save        Save one or more images to a tar archive (streamed to STDOUT by default)
  start       Start one or more stopped containers
  stats       Display a live stream of container(s) resource usage statistics
  stop        Stop one or more running containers
  tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
  top         Display the running processes of a container
  unpause     Unpause all processes within one or more containers
  update      Update configuration of one or more containers
  wait        Block until one or more containers stop, then print their exit codes


Run 'docker COMMAND --help' for more information on a command.

For more help on how to use Docker, head to https://docs.docker.com/go/guides/

Conclusion:

In this article we have covered How to Install Docker on Ubuntu 22.04 LTS

For Reference:

Please visit the official website of Docker.

Any queries pls contact us Rushi Infotech

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *