In this tutorial, we will guide you through the process of installing Docker Community Edition on Ubuntu 20.04 LTS. Docker is an open-source platform that allows you to automate the deployment, scaling, and management of applications within containers.
To install Docker Community Edition on Ubuntu 20.04 LTS, you need to update your system, install the required packages, add Docker’s official GPG key, set up the Docker stable repository, install Docker CE, and verify the installation by running a test image.
Pre-requisites
Before we start, ensure that you have the following:
- A system running Ubuntu 20.04 LTS
- A user account with
sudoprivileges - Access to a terminal or command line
Step 1: Update Your System
First, it’s always a good idea to make sure your system is up to date. Open your terminal and run the following command:
sudo apt-get updateThis command fetches the package lists from the repositories and “updates” them to get information on the newest versions of packages and their dependencies.
Step 2: Install Required Packages
Next, install the necessary packages that would allow apt to use a repository over HTTPS:
sudo apt-get install \
apt-transport-https \
ca-certificates \
curl \
gnupg-agent \
software-properties-commonHere’s what these packages do:
apt-transport-https: This package allows the package manager to transfer files and data over https.ca-certificates: This package allows the system to check security certificates.curl: This package transfers data from or to a server.gnupg-agent: This package allows the system to manage GPG keys.software-properties-common: This package manages the repositories you install software from.
Step 3: Add Docker’s Official GPG Key
Now, add Docker’s official GPG key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -This command downloads the Docker GPG key with curl (in a fail-safe mode -fsSL) and adds it to your system’s list of keys.
Step 4: Set Up the Docker Stable Repository
Next, set up the Docker stable repository. To do so, enter the following command:
sudo add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"This command adds a new repository over https from Docker’s website to your system’s software source list.
Step 5: Install Docker Community Edition
Now, you can install Docker CE:
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.ioThe docker-ce package represents the Docker Community Edition. The docker-ce-cli package is the Docker command-line interface, and containerd.io is a container runtime.
Step 6: Verify the Installation
Finally, verify that Docker is installed correctly by running the hello-world image:
sudo docker run hello-worldThis command downloads a test image and runs it in a container. If the installation is successful, you should see a welcome message.
Conclusion
Congratulations! You have successfully installed Docker Community Edition on Ubuntu 20.04 LTS. You can now use Docker to automate the deployment, scaling, and management of your applications within containers. For more information on how to use Docker, you can visit the official Docker documentation.
Remember that Docker is a powerful tool, and with great power comes great responsibility. Always ensure that you understand the commands you are running in your Docker environment. Happy Dockering!
Yes, Docker is compatible with various versions of Ubuntu. However, the installation steps may vary slightly. It’s recommended to refer to the official Docker documentation for specific instructions.
No, you don’t need root access. However, you need a user account with sudo privileges to run the installation commands.
To uninstall Docker, you can run the following command:
sudo apt-get purge docker-ce docker-ce-cli containerd.ioThis command removes the Docker packages and their configuration files from your system.
Yes, Docker provides a graphical user interface called Docker Desktop for Windows and macOS. It allows you to manage Docker containers and images through a user-friendly interface.
No, Docker can be used to run various types of applications, including web applications, databases, microservices, and more. Docker provides a flexible and scalable platform for deploying and managing different types of software.
Yes, Docker can be run on virtual machines. In fact, many cloud providers offer virtual machine instances with Docker pre-installed. Docker provides a consistent environment for running containers, regardless of the underlying infrastructure.
To update Docker, you can run the following command:
sudo apt-get update
sudo apt-get upgrade docker-ce docker-ce-cli containerd.ioThis command updates the Docker packages to the latest available versions.
Yes, Docker provides Docker Desktop, which is available for both Windows and macOS operating systems. Docker Desktop allows you to run Docker containers natively on your machine without the need for a virtual machine.
Yes, Docker is widely used in production environments. It provides isolation, scalability, and portability for applications. However, it’s important to properly configure and secure your Docker environment for production usage.
Docker Hub is the largest public registry of Docker images. You can search for existing images on Docker Hub or create your own custom images using Dockerfiles. Additionally, many software vendors and open-source projects provide official Docker images for their applications.
