Ubuntu Docker Post Install

Docker doesn’t need any introduction now, it is a popular and free-to-use container solution that has established itself very well in the field of container-based applications. Here we will learn the best way to install Docker on Ubuntu Hirsute 21.04, Ubuntu Groovy 20.10, Ubuntu Focal 20.04 (LTS), and Ubuntu Bionic 18.04 (LTS).

Install the docker package # apt-get install docker.io; This is a example of the package being installed on a 2-sockets POWER8 S822-L machine. (you may click on these images to see a larger version of the image) Figure 2: Docker.io package being installed on Ubuntu 14.10. Creating the Ubuntu Core image in Docker. Download Ubuntu Core based on. Sep 08, 2020 Step 3: Installing Docker. Now let’s install Docker on Ubuntu 20.04. Run the following command in the terminal window: sudo apt install docker.io. Type y and hit Enter to confirm the installation. Once the install is completed, the output notifies you Docker has been installed. Step 4: Checking Docker Installation.

Being a containerized software solution, Docker offers all functions needed to virtualize applications and operate the containers in an isolated environment from one another, on a host system. A container contains all the resources required to run an application, including the application code, the runtime environment, the system libraries, and the system tools. The system which manages the computer’s resources to the individual containers and ensures their isolation on the host system is called Docker Engine.

In order to get the Portainer Web UI up and running, all you need to do is run the following command: docker run -d -p 9000: 9000-v / var /run/docker.sock:/ var /run/docker.sock portainer/portainer. Open Ubuntu WSL App. Currently, there are two long term Ubuntu versions available on Microsoft Store to install: Ubuntu 18.04 LTS & Ubuntu 20.04 LTS Linux. To get started with Docker Engine on Ubuntu, make sure youmeet the prerequisites, theninstall Docker.

Few key advantages of using Docker container machines:

  • Free to use Software
  • It requires fewer resources than virtual machines
  • Scalability
  • Provides Security and isolates the applications from one another and from the host system
  • Lightweight
  • Simple management of many containers via orchestration tools such as Kubernetes
  • The availability of containers in the image file makes it easily transferrable to other systems.
  • Easy to install and Quickstart


  • Best method to install Docker on Ubuntu 20.04 Linux
InstallUbuntu docker post install youtube

Best method to install Docker on Ubuntu 20.04 Linux

There are three ways to install Docker on Ubuntu Linux but the best one is by using its official repository. Whereas the two others are SNAP and the base repo.

Hence, here we will show the steps to set up Docker on Ubuntu by adding its official repository which is the best possible way to get the latest stable version. Of course, we can get it via SNAP but due confinement model of Snap you may get issues in connecting to the Docker daemon. Or the system would not be able to recognize the docker daemon running on the host. On the other side, the Docker installation from Ubuntu’s base repo will be an extremely stable one, no doubt, but with no guarantee, you will get the latest one with all new features. Hence, go for the tutorial given below:

1. Add few common packages

There are few packages we require during the setup of Docker on Ubuntu such as adding its repo over HTTPS need package that supports it, curl, and lsb-release to know the version of Linux.

2. Add Docker’s GPG Key

Before adding the repository of Docker, we have to add the GPG key that will ensure the packages we will get to install Docker, are from the authentic source without any kind of alteration.

3. Best way- Add Stable Docker repository on Ubuntu 20.04 or others

Now, on your Ubuntu, paste the following block of command and hit Enter key. It will automatically detect your Ubuntu version to add the corresponding available repository.

4. Run system update

To let the system know that we have recently added a new repository, run a system update command to rebuild the system repo cache.

5. Install Docker Engine on Ubuntu

Finally, run a single command that will install and set up the Docker community version with other required tools on your Ubuntu 20.04 Linux or the one you are using.

Ubuntu docker post install script

6. Test your installation

To know everything has been installed correctly to work with containers, let’s create a simple container image called hello-world.

7. Add your User to the Docker group

By default, to create any Container or to run the Docker command you have to use sudo with it. To remove this, we need to add our current to its group.

Reload group

That’s it, now the latest version of Docker is on your respective Ubuntu version. From here you can start exploring and creating containers by pulling from DockerHub or creating your own image.

If you are not comfortable with the command line then try out the Docker GUI, here is the article on it: Install Portainer Docker Web GUI or How to install Kitematic on Ubuntu 20.04 LTS…

Docker is a combo of ‘platform as a service’ products and services which use OS virtualisation to provide software in packages called containers.

In this guide I cover installing Docker on Ubuntu 20.04 LTS (Focal Fossa), but the same steps may also work on older versions of Ubuntu, including Ubuntu 18.04 LTS. In this post you will learn how to install Docker from the regular Ubuntu repository, how to enable Docker to start automatically at system boot, and how to install Docker images. A minimal Ubuntu base image modified for Docker-friendliness. Baseimage-docker only consumes 8.3 MB RAM and is much more powerful than Busybox or Alpine. Baseimage-docker is a special Docker image that is configured for correct use within Docker containers. It is Ubuntu, plus: Modifications for Docker-friendliness.

Containers contain everything an app, tool or service needs to run, including all libraries, dependencies, and configuration files. Containers are also isolated from each other (and the underlying host system), but can communicate through pre-defined channels.

This introduction to Docker video will give you a quick top-level overview of the tech and how it works:

Docker Post Install Ubuntu 18

To install Docker on Ubuntu and Debian, you can follow this tutorial. It provides great and extensive details on how to correctly set up Docker on Linux. Again, to verify that Docker is correctly installed, you can run the following command. Notice that docker-ce is not installed, but the candidate for installation is from the Docker repository for Ubuntu 18.04 (bionic). Finally, install Docker: sudo apt install docker-ce Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running: sudo systemctl status docker.

Because Docker is open source software it’s not only free to use, but free to adapt, extend, hack, or build on. In this guide I cover installing Docker on Ubuntu 20.04 LTS (Focal Fossa), but the same steps may also work on older versions of Ubuntu, including Ubuntu 18.04 LTS.


In this post you will learn how to install Docker from the regular Ubuntu repository, how to enable Docker to start automatically at system boot, and how to install Docker images and run them locally.

But this isn’t a deep dive. This tutorial is intentionally short and to the point. This is so you spend less time reading and more time doing.

Install Docker from Ubuntu Repository

There are two hard requirements to install Docker on Ubuntu 20.04:

  • You need to have sudo access
  • You need to be connected to the internet

If you’re managing or setting up an Ubuntu server then you (probably) meet both of these requirements already, but do check before you begin.

Step 1: Install Docker from the main Ubuntu repository. Do this using the apt command and the docker.io package name (note: the package name is not simply ‘docker’):

Docker Post Install Ubuntu Linux

Docker Ubuntu Post Install Steps

Ubuntu will download the latest version of Docker from its archives, unpack it, and install it on your system.

Step 2: Make Docker start automatically on system boot:

Step 3: Test it.

Now that Docker is installed and running you should verify that everything is working okay. This can be done using the hello-world app. From the command line run:

When you run this command you’ll see a lengthy message informing you that the ‘installation appears to be working correctly’.

But look closely at the message:

Ubuntu Docker Post Install Without

You’ll notice something interesting near the start: Docker was ‘unable to find’ the a ‘hello-world’ image. But instead of quitting it searched for and downloaded it from Docker Hub.

Which leads us neatly on to…

Step 4: Find and install Docker images.

Now you’re set-up the world (or rather the Docker ecosystem) is your oyster, and Docker Hub your port of call. Docker Hub is billed as ‘the world’s largest library and community for container images’. Any image available on Docker Hub can be installed on your system too.

Let’s look at how to do that.

To search for an image on Docker Hub run the docker command with the search subcommand, like so:

For example, I want to search for Alpine Linux on Docker Hub so I run docker search alpine. A list of matching images (which match the term alpine) will appear. I want the official Alpine image so I look in the OFFICIAL column for the word OK

When you find the image you want to use you can download it using the pull subcommand, For example, to install Alpine Linux I run sudo docker pull alpine.

To run a downloaded image you need to add the run subcommand and the name of the image, e.g., sudo docker run alpine.

If you want to run an image as a container and get instant ‘interactive terminal’ shell access add the -it flag. For example: I run sudo docker run -it alpine and it drops me straight into the Alpine container, ready to work:

To exit the ‘interactive terminal’ type the word exit and hit enter.

Ubuntu Docker Post Install Checklist

Docker Post Install Ubuntu Debian

Ubuntu Docker Post Install Wizard

Check out the Docker Docs page for a wealth more info on how to use, admin, manage, and maintain your containers.

Ubuntu Docker Post Install

A couple of useful commands to know include docker ps -a to list all images you’ve used (and see their container ID/name); docker stop {container id} to close an image down; and when you’re done with a container remove it using the docker rm command, again adding the the container ID/name at the end.

Going Further

In this guide we looked at installing Docker on Ubuntu 20.04 and getting official images installed. But this is only the beginning of what possible with Docker.

Docker Post Install Ubuntu Virtualbox

One possible avenue to explore is installing Docker rootless. This is an experimental feature and not (yet) easy to enable. But the effort required to set it up is worth it if you’re concerned about security and stability.

Docker Post Install Ubuntu Usb

If there are topics you want to see a similar to-the-point tutorial on (be it Docker related or otherwise) do drop a note down in the comments or via my usual e-mail.

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