🐳 Complete Guide to Installing Docker & Docker Compose V2 on Ubuntu

D: 🚀 Want to harness the power of containerization on Ubuntu? Docker makes it incredibly easy to deploy applications in isolated environments. In this guide, we’ll walk you through installing Docker Engine and Docker Compose V2 on Ubuntu (20.04/22.04 LTS) step by step.

🔧 Prerequisites

✔ Ubuntu 20.04/22.04 LTS (Recommended)
✔ Terminal access (Ctrl+Alt+T)
✔ sudo privileges

📌 Step 1: Uninstall Old Docker Versions (If Any)

Before installing, ensure no old Docker versions are lingering:

sudo apt-get remove docker docker-engine docker.io containerd runc

📌 Step 2: Install Required Dependencies

Update your system and install essential packages:

sudo apt-get update
sudo apt-get install -y ca-certificates curl gnupg lsb-release

📌 Step 3: Add Docker’s Official GPG Key

To verify package authenticity, add Docker’s GPG key:

sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

📌 Step 4: Set Up Docker Repository

Add Docker’s stable repository:

echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.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

Now, install the latest Docker Engine:

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

✅ Verify Docker Installation:

sudo docker run hello-world

(If you see Hello from Docker!, it’s working! 🎉)

📌 Step 6: Install Docker Compose V2 (Standalone)

Docker Compose V2 is now a plugin. To install it:

sudo apt-get install -y docker-compose-plugin

✅ Check Docker Compose Version:

docker compose version

(Should display Docker Compose version v2.x.x)

📌 Step 7: Manage Docker as a Non-Root User (Optional)

By default, Docker requires sudo. To avoid this, add your user to the docker group:

sudo usermod -aG docker $USER
newgrp docker  # Refresh group changes

Now, run Docker without sudo!

📌 Step 8: Enable Docker on Startup

To ensure Docker starts automatically:

sudo systemctl enable docker
sudo systemctl start docker

🎉 Congratulations!

You’ve successfully installed Docker Engine + Docker Compose V2 on Ubuntu! 🚀

🔹 What’s Next?

✔ Try running a sample container:

docker run -d -p 80:80 nginx

✔ Learn Docker basics with:

docker --help

💡 Got stuck? Drop a comment below! Let’s debug together. 👇

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