How to Install Docker on Ubuntu

Many businesses were looking for different ways to increase productivity in their teams. Many of them had tiresome processes, and it took a lot of time to develop and deploy an app. They later embraced Docker despite being a new technology and incorporated it into their development processes. Currently, many developers use Docker due to their containers that make cloud development easier. This article will cover a brief introduction to Docker, its benefits, and how to install it on Ubuntu operating system.

What is Docker

Docker is an open-source platform as a service(Paas) software that uses containers that enables companies to package their applications into virtualized operating systems. It allows them to run in any environment without installing the dependencies and operating systems. The containers make deploying applications to the cloud environments easier and faster.

Docker works as a tool kit, and it gives software developers and professionals the chance to perform many activities like run, update, build, deploy, and start containers using commands. It saves a lot of time it would take when using the normal environments. Software teams view it as a tool of automation, especially for teams that use the DevOps mechanism.

Most containers use virtual machines that are isolated and built on Linux Kernels. They have control groups(C groups)that help allocate resources amongst the application processes. It uses namespaces to ensure that a process does not affect the other resources of the software. It gives several application components the chance to share resources of a single part of the operating system in usage.

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Steps on how to install Docker on Ubuntu

Prerequisites

  • Basic knowledge of using the terminal.
  • An account with sudo privileges.
  • Have Ubuntu operating system installed on your PC.

There are four methods of installing Docker on the Ubuntu operating system. These methods are:

  • Using the default repository.
  • Using the official repository.
  • Using a .deb package.
  • Using convenience script

Method 1. Install Docker from the default repositories

Update the software packages and upgrade all the dependencies, this ensures that all the software is up to date. Open the terminal and type the following command:

sudo apt-get update

Install Docker by typing the following command on the terminal:

sudo apt install docker.io

After the installation, automate the Docker by activating the Docker service. Run the following commands:

sudo systemctl start docker

sudo systemctl enable docker

To confirm if Docker is successfully installed on your PC. Type the following command on the terminal and hit Enter:

docker --version

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Method 2. Install Docker using the official repository

In this step, we use the Docker installation package located in the Ubuntu repository. Its version may be outdated. We first update all the local databases and packages.

sudo apt-get update

After updating everything, we need to download the dependencies, which involves getting them over the HTTPS.

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

The command consists of apt-transport-https, which enables the transfer of files and data,ca-certificates for confirming the security certificates, curl to transfer the data, and software-properties-common, which manages the software.

Now, let's add the GPG key, which helps ensure the software is secure and not from a fake source.

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

The next step is to install the Docker repository, which checks and returns the codename of the installation.

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu  $(lsb_release -cs)  stable"

Update all the existing repositories by typing the following command on the terminal:

sudo apt-get update

Get the latest version of the Docker packages 

sudo apt-get update

Install all the latest Docker packages

sudo apt-get install docker-ce

You can specify the type of Docker packages you want by typing the following command:

apt-cache madison docker-ce 

You can choose the correct version by specifying as follows

sudo apt-get install docker-ce=[version]

 where you replace the version with the version you want.

Method 3:Install Docker from a .deb package

To get a .deb package.Head over to the Docker official website, click on Pool, next click on Stable, and finally, the amd64 option.

Choose the package you want to install from the list and download it.

Type the following command on the terminal to install the Docker file. Remember to use the path of the downloaded file correctly.

sudo dpkg -i /path/to/docker.package.deb

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Method 4:Use of convenience scripts

Don’t ever use this method during deployment or production. It's only meant for testing purposes. The first step is to have the Docker engine installed.

To install the Docker engines, use the script from https://get.docker.com/ to install it by running the following command on the terminal:

curl -fsSL https://get.docker.com -o get-docker.sh

To install Docker, run the following command that automatically starts the Docker.

sh get-docker.sh

Benefits of using Docker in my project

This technology has a lot of advantages for the users due to the use of containers. Some of the benefits of using Docker when building applications include:

  • It's light. Docker doesn't carry the whole operating system but uses its processes and dependencies to run the code. It ensures that the hardware is well utilized and takes less time to start.
  • It has good portability. Most of the Docker applications run in different environments without requiring any modification. It makes it easier to move across different environments.
  • It uses automation. It uses images and automated procedures that let developers concentrate on writing code, and the rest of the infrastructure is already sorted.
  • It's easier to scale. When you have your applications deployed and there is an increase in demand. Docker gives you the option to add new containers to meet your needs.
  • It's very efficient. When using Docker, the containers have options of running different copies of a certain project using the same hardware resources. It cuts the costs.
  • It improves productivity. When developers use the Docker containers, they are fast and easier to use, making other processes like CI/CD(Continuous Integration/Continuous Delivery) work well with the company policy and practices. It makes processes like DevOps and Agile successful, increasing the teams' productivity. 

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Conclusion

Most companies used physical servers and other technologies that brought a lot of issues to the teams. It was a bit hard, especially right now when there are a lot of cybersecurity issues.

When you incorporate Docker into your development team, it gives you a lot of flexibility and assurance that everything is well from development and deployment to production. Learning and using Docker is faster and more accessible, and it won't take much time to master its usage. 

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Srivalli
Srivalli
Research Analyst
As a senior technical content writer for HRK tainings, srivalli patchava has a greater understanding of today's data-driven environment, which includes key aspects of data management and IT organizations. She manages the task of creating great content in the areas of software testing, DevOps, Robotic process automation. Connects with her on Linkedin and Twitter.