How to Install Docker on Ubuntu 24.04 LTS

Docker is a platform that bundles applications with all their required components into compact, portable containers. Unlike virtual machines, these containers use the host system’s operating system kernel, which makes them quicker to start and more resource-friendly.

Key benefits of Docker include:

• Consistency across environments: Applications run identically on development, testing, and production systems
• Resource efficiency: Containers are lightweight and don’t need an entire operating system to run, so they consume much less memory and CPU compared to virtual machines.
• Rapid deployment: Since containers are small and self-contained, you can launch applications in just a few seconds instead of waiting minutes like traditional setups.
• Easy scaling: Scale applications up or down based on demand
• Isolated environments: Run multiple applications without conflicts

System Requirements

Before installing Docker on Ubuntu 24.04, ensure your system meets these requirements:

• Ubuntu 24.04 LTS (64-bit)
• Minimum 4GB RAM (8GB recommended)
• At least 20GB free disk space
• User account with sudo privileges
• Active internet connection

Verify your Ubuntu version:

lsb_release -a

Installation Method 1: Official Docker Repository (Recommended)

This method uses Docker’s official repository to install the software, so you’ll always get the most up-to-date stable version along with important security updates.

Step 1: Update System Packages

Start by updating your package manager and upgrading existing packages:

sudo apt update

sudo apt upgrade -y

Step 2: Install Prerequisites

Install required packages for adding external repositories over HTTPS:

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

These packages enable:

• apt-transport-https: HTTPS support for package manager
• ca-certificates: Certificate authority certificates
• curl: Command-line tool for downloading files
• software-properties-common: Scripts for managing software repositories

Step 3: Add Docker’s GPG Key

Download and add Docker’s official GPG key to verify packages:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Step 4: Add Docker Repository

Add Docker’s stable 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: Update Package Index

Refresh the package list to include Docker packages:

sudo apt update

Step 6: Install Docker Engine

Install Docker Engine and related components:

sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y

This command installs:

• docker-ce: Docker Community Edition engine
• docker-ce-cli: Command-line interface
• containerd.io: Container runtime
• docker-buildx-plugin: Extended build capabilities
• docker-compose-plugin: Multi-container application management

Installation Method 2: Convenience Script

Docker provides an automated installation script. While convenient, this method is not recommended for production environments due to security considerations.

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

sudo sh get-docker.sh

rm get-docker.sh

Post-Installation Setup

Enable and Start Docker Service

Configure Docker to start automatically on system boot:

sudo systemctl enable docker

sudo systemctl start docker

Check service status:

sudo systemctl status docker

Configure User Permissions

Add your user to the Docker group to use Docker without typing sudo every time:

sudo usermod -aG docker $USER

Apply group changes by logging out and back in, or use:

newgrp docker

Verify Installation

Test Docker installation with these commands:

docker --version

docker info

Run the hello-world container to check if Docker is set up properly.

docker run hello-world

A successful installation will display the “Hello from Docker!” message.

Essential Docker Commands

Here are fundamental Docker commands every user should know:

Container Management:

# List running containers
docker ps
# List all containers
docker ps -a
# Start a container
docker start container_name
# Stop a container
docker stop container_name
# Remove a container
docker rm container_name

Image Management:

# List local images
docker images
# Pull an image from registry
docker pull image_name
# Remove an image
docker rmi image_name
# Build image from Dockerfile
docker build -t image_name .

Running Containers:

# Run container interactively
docker run -it ubuntu bash
# Run container in background
docker run -d nginx
# Run container with port mapping
docker run -p 8080:80 nginx

Common Configuration Tasks

Configure Docker Daemon

Create or Edit the Docker daemon config file:

sudo mkdir -p /etc/docker

sudo nano /etc/docker/daemon.json

Example configuration:

{
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3"
  },
  "storage-driver": "overlay2"
}

Restart Docker after configuration changes:

sudo systemctl restart docker

Set Up Docker Compose

Docker Compose is included with the docker-compose-plugin. Verify installation:

docker compose version

Troubleshooting Common Issues

Permission Denied Errors

If you encounter permission errors after adding user to docker group:

1. Log out and log back in
2. Restart the Docker service: sudo systemctl restart docker
3. Verify group membership: groups $USER

Docker Service Won’t Start

Check Docker service status and logs:

sudo systemctl status docker

sudo journalctl -u docker

Common solutions:

1. Restart the docker service: sudo systemctl restart docker
2. Check disk space: df -h
3. Verify configuration file syntax

Storage Issues

Docker stores data in /var/lib/docker/. Monitor disk usage:

docker system df

Clean up unused resources:

docker system prune -a

Security Best Practices

Implement these security measures for production environments:

• Keep Docker Updated:

  sudo apt update

  sudo apt upgrade docker-ce docker-ce-cli containerd.io

• Use Official Images:
  Pull images from official repositories
  Verify image signatures when possible
  Scan images for vulnerabilities
• Limit Container Privileges:
  Avoid running containers as root
  Use user namespaces
  Implement resource limits
• Network Security:
  Use custom bridge networks
  Limit port exposure
  Implement proper firewall rules

Performance Optimization

Storage Driver Configuration

Ubuntu 24.04 uses an overlay2 storage driver by default, which offers optimal performance. Verify current driver:

docker info | grep "Storage Driver"

Resource Limits

Set container resource limits to prevent resource exhaustion:

# Limit memory and CPU
docker run -m 512m --cpus="1.0" nginx

Image Optimization

• Use multi-stage builds
• Minimize image layers
• Use appropriate base images
• Remove unnecessary packages

Uninstalling Docker

If you need to completely remove Docker:

Step 1: Stop Docker service

sudo systemctl stop docker

Step 2: Remove Docker packages

sudo apt purge docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Step 3: Remove Docker data

sudo rm -rf /var/lib/docker

sudo rm -rf /var/lib/containerd

Step 4: Remove repository

sudo rm /etc/apt/sources.list.d/docker.list

sudo rm /usr/share/keyrings/docker-archive-keyring.gpg

Next Steps

After successfully installing Docker, consider exploring these advanced topics:

• Container Orchestration:
  • Docker Swarm for clustering
  • Kubernetes integration
  • Container networking
• Development Workflow:
  • Creating custom Dockerfiles
  • Multi-container applications with Docker Compose
  • CI/CD pipeline integration
• Monitoring and Logging:
  • Container health checks
  • Log aggregation
  • Performance monitoring

Conclusion

Installing Docker on Ubuntu 24.04 LTS is simple and reliable when you use the official Docker repository. This approach ensures you receive regular security updates and access to the latest features. The installation process typically takes 10-15 minutes and provides a solid foundation for containerized application development and deployment.

Docker transforms how applications are built, shipped, and run. Whether you’re developing microservices, testing applications in isolated environments, or deploying scalable web applications, Docker provides the tools and flexibility needed for modern software development.

Start with basic container operations, gradually progress to more complex scenarios like multi-container applications, and eventually explore orchestration platforms for production deployments. The Docker ecosystem offers extensive documentation and community support to help you master containerization technology.