Docker Installation And Compose

🔧 My Docker Compose 🔧

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🐳 Docker Installation (Debian 10/11/12)

To install Docker on Debian, follow these steps:

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🔹 Step 1: Update Your System

sudo apt update && sudo apt upgrade -y

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🔹 Step 2: Install Required Packages

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

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🔹 Step 3: Add Docker’s Official GPG Key

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

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🔹 Step 4: Set Up the Docker Repository

Replace $(lsb_release -cs) with your Debian codename if necessary (e.g., bullseye).

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \
  https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

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🔹 Step 5: Update Package List

sudo apt update

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🔹 Step 6: Install Docker Engine

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

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🔹 Step 7: Enable and Start Docker

sudo systemctl enable docker
sudo systemctl start docker

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🔹 Step 8: Test Docker

sudo docker run hello-world

✅ You should see a message confirming Docker is installed correctly.

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🔸 (Optional) Run Docker as Non-Root User

sudo usermod -aG docker $USER

Log out and back in to apply group changes.

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⚙️ Docker Compose Setup

Docker Compose lets you define and run multi-container Docker apps with a single command.

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📝 Step 1: Create a File Named docker-compose.yml

This file defines your services and configurations.

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🧱 Step 2: Basic Structure

version: '3.8'

services:
  service_name:  # e.g., web, db
    image: image_name:tag
    ports:
      - "8080:80"
    volumes:
      - ./host_path:/container_path
    environment:
      - VAR_NAME=value
    restart: unless-stopped

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🌐 Step 3: Example — Nginx + MySQL Stack

version: '3.8'

services:
  web:
    image: nginx:latest
    ports:
      - "8080:80"
    volumes:
      - ./html:/usr/share/nginx/html
    restart: unless-stopped

  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: examplepassword
    volumes:
      - db-data:/var/lib/mysql
    restart: unless-stopped

volumes:
  db-data:

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▶️ Step 4: Run Docker Compose

docker-compose up -d

• up — starts services.
• -d — runs in detached/background mode.

To stop the stack:

docker-compose down

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💡 Tips

• YAML is indentation-sensitive — use spaces, not tabs!
• Keep your docker-compose.yml in the project root.
• For advanced setups, define custom networks and volumes at the bottom.
• Official reference: Docker Compose File Reference

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