Docker Installation

docker

containers

fundamentals

Installing and configuring Docker in production environments

Published

January 25, 2026

Docker Installation

Scenario: Preparing for Containerized Applications

Company: Stratos Datacenter
Role: Platform Engineer
Task: Install and configure Docker on stapp01 for the development team

🧠 Why Docker?

Docker standardizes application packaging:

Package: Your app + dependencies
Standardize: Docker image format
Isolate: From the host system
Transport: Easily between environments

Platform Engineer Insight: Docker enables: - Microservices architecture - Fast CI/CD pipelines - Horizontal scaling - Cloud portability

🛠️ Implementation

Step 1: Access the Server

ssh tony@172.16.238.10
sudo su -

Step 2: Install Docker

# Update package index
apt-get update

# Install dependencies
apt-get install -y apt-transport-https ca-certificates curl gnupg lsb-release

# Add Docker GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

# Add Docker repository
echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker
apt-get update
apt-get install -y docker-ce docker-ce-cli containerd.io

Step 3: Configure Docker

# Enable and start Docker
systemctl enable docker
systemctl start docker

# Add user to docker group
usermod -aG docker tony

# Verify installation
docker --version
docker run hello-world

✅ Verification

Docker daemon is running: systemctl status docker
Docker version displayed: docker --version
Hello-world container runs: docker run hello-world
User can run Docker without sudo (after logout/login)

🎯 Key Learnings

Docker architecture (daemon, client, registry)
Package installation from official repositories
Systemd service management
User group permissions

✅ Status

COMPLETED 🎉

Date: 2026-01-25
Difficulty: 3/5

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