Docker is now a go-to tool for system managers and developers. It lets you run and package apps in containers, which makes deployment easier. This guide will show you how to install Docker on Ubuntu 22.04.
What is Docker?
Docker is a platform for building, sharing, and running apps in containers. Containers are small, standalone packages that have everything needed to run a piece of software. This includes the code, runtime, system tools, libraries, and settings.
Why use Docker?
- It makes sure your app runs the same way in development, testing, and production.
- Containers are separate from each other and the host system, which makes things more secure.
- Containers are lighter than virtual machines because they share the host’s operating system.
- Docker containers can run on any machine that supports Docker, no matter what operating system it uses.
Installation Steps
Step 1: Update Your System
First, make sure your system is up to date:
sudo apt update
sudo apt upgrade -y
Step 2: Install Required Packages
Install the packages needed for HTTPS:
sudo apt install apt-transport-https ca-certificates curl software-properties-common -y
Step 3: Add Docker’s Official GPG Key
To make sure the downloads are genuine, add Docker’s official GPG key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
Step 4: Set Up the Docker Repository
Add the Docker repository to your system:
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
Step 5: Install Docker Engine
Update the package database with Docker packages from the new repository:
sudo apt update
Install Docker:
sudo apt install docker-ce docker-ce-cli containerd.io -y
Step 6: Verify the Installation
Run the hello-world image to check if Docker is installed correctly:
sudo docker run hello-world
If the installation worked, you’ll see a message saying so.
Step 7: Use Docker Without Root
Add your user to the docker group so you don’t have to type sudo every time you run a Docker command:
sudo usermod -aG docker ${USER}
You’ll need to log out and back in for this to work.
Step 8: Set Docker to Start on Boot
Make Docker start when your system boots:
sudo systemctl enable docker
Common Docker Commands
docker ps: List running containersdocker images: List downloaded imagesdocker pull [image]: Download an imagedocker run [image]: Run a container from an imagedocker stop [container]: Stop a running containerdocker rm [container]: Remove a stopped container
Also Read:
- How To Install Docker and Kubernetes on Your VPS?
- How To Install Discourse Forum on Ubuntu 20.04 Using Docker
Troubleshooting
If you run into problems, try these steps:
- Check Docker service status:
sudo systemctl status docker - Restart Docker:
sudo systemctl restart docker - View Docker logs:
sudo journalctl -u docker
Note: Always be careful when running Docker containers, especially ones from unknown sources. If not set up correctly, containers can get full access to your system.
Conclusion
Congratulations! You’ve successfully installed Docker on your Ubuntu 22.04 machine. You’re now ready to start running, shipping, and designing containerized apps. Remember to keep Docker updated and regularly check for security best practices to keep your containerized environment safe. and for Ubuntu VPS Server Keep shopping on VPSWALA!
Happy containerizing!
