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Ubuntu Linux 16.04 LTS reached the end of its five-year LTS window on April 30th 2021 and is no longer supported. Docker no longer releases packages for this distribution (including patch- and security releases). Users running Docker on Ubuntu 16.04 are recommended to update their system to a currently supported LTS version of Ubuntu. This image consists of SQL Server running on Linux based on Ubuntu 20.04. It can be used with the Docker Engine 1.8+ on Linux or on Docker for Mac/Windows. This quickstart specifically focuses on using the SQL Server on Linux image. The Windows image is not covered, but you can learn more about it on the mssql-server-windows-developer Docker.


Docker is a container service which allows one to run applications or even operating systems on a host operating system as containers. Containers are a new and exciting technology that has evolved over the last couple of years and being adopted by a lot of key organizations.

Use Docker on Ubuntu 20.04. The basic syntax for docker commands is: sudo docker option command argument Run Docker Commands Without Sudo. By default, you can only use the docker commands with root privileges. Ubuntu requires the use of the sudo prefix.

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Ubuntu Linux 16.04 LTS reached the end of its five-year LTS window on April 30th 2021 and is no longer supported. Docker no longer releases packages for this distribution (including patch- and security releases). Users running Docker on Ubuntu 16.04 are recommended to update their system to a currently supported LTS version of Ubuntu. In this tutorial, I will go through all steps of installing Docker on Ubuntu 20.04 and learn the fundamental concepts when working with docker containers/images. In the official software repository of Ubuntu 20.04, the docker installation package is available by default. However, it isn't the up-to-date version.

Docker is a company that develops these special containers for applications. The official website for Docker is https://www.docker.com/

As an exercise, let’s install a CentOS container on an Ubuntu system. CentOS is a Linux-based operating system from Red Hat. Thus, we will be running the CentOS system on top of Ubuntu. Following are the steps to have this in place.

Step 1 − The first step is to install the Docker application on Ubuntu server. Thus on the Ubuntu test server, run the following command to ensure that OS updates are in place.

Step 2 − Once all updates have been processed, issue the following command to get Docker installed.

Step 3 − Once the Docker packages are installed, we should receive an output message stating that the Docker process has started and is running. The Docker process is known as the Docker engine or Docker daemon.

Step 4 − To view the version of Docker running, issue the Docker info command.

Step 5 − The next step is to install our CentOS image on Ubuntu.

Docker has a special site called the Docker hub, which is used to store pre-built images for Docker. The link to the site is https://hub.docker.com/

Step 6 − Do a quick and simple sign-in process to be able to log into the site and see all the available Docker images.

Step 7 − Once logged in, click the Explore button to see all the available Docker images.

The two important points to note are −

  • The Docker pull command. This is the command to install the Docker image on Linux box.

  • The Docker details for the various versions of CentOS.

Step 8 − On Ubuntu box, run the command.

The download of the Docker component starts and the CentOS Docker is downloaded. The name of the Docker image is centos:latest, which means that we have the latest Docker image for CentOS.

Ubuntu Dockers

Step 9 − To see all the Docker images installed, issue the command

Ubuntu Dockers

In the following screenshot, we can see that the Docker image is just 196.8 MB in size, and this is the subset of the CentOS which now runs on Ubuntu system.

Step 10 − To start CentOS, we need to issue a command to the OS to get a thread started. We can do this by running the following command.

The above command does the following things −

Ubuntu Dockers Commands

  • Runs the CentOS Docker image.

  • Runs the image in interactive mode by using the -it option.

  • Runs the /bin/bash command as the initial process.

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