Docker

Learn how to install and configure Docker on Ubuntu for containerized applications

What is Docker?

Docker is an open-source platform that automates the deployment, scaling, and management of applications using containers. Containers allow you to package an application and its dependencies together, ensuring it runs consistently across different computing environments.

Docker simplifies the development and operations (DevOps) process by creating isolated environments where applications can run with minimal overhead. It eliminates the "works on my machine" problem, enabling developers to build, test, and deploy applications quickly and reliably.

Install Docker

Add Docker's official GPG key:

Bash

sudo apt-get update
sudo apt-get install -y ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

Add the repository to Apt sources:

Bash

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Start Docker service

Bash

sudo systemctl enable docker
sudo systemctl start docker
sudo systemctl status docker

Run docker without sudo:

Bash

sudo groupadd docker
sudo usermod -aG docker $USER
newgrp docker

Bash

sudo reboot now

Install Docker Compose

Bash

sudo curl -SL https://github.com/docker/compose/releases/download/v2.30.3/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose

Bash

sudo chmod +x /usr/local/bin/docker-compose

Verify Installation

Bash

docker run hello-world

Docker

What is Docker?

Install Docker

Start Docker service

Install Docker Compose

Verify Installation

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