Docker & Containerized App Setup

1. Why Docker on KVM VPS?

Unlike shared web hosting, an OrynCloud KVM VPS provides native Linux kernel virtualization. This permits running bare-metal Docker daemon processes with full cgroup isolation, enabling you to launch Nginx, Redis, PostgreSQL, and custom Node.js/Python containers without port collisions.

2. Installing Docker Engine via Official Script

Run the official automated Docker installation script on Ubuntu 22.04 / 24.04 or Debian 12:

# Download and execute Docker convenience script
curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh get-docker.sh

# Enable and start Docker service
sudo systemctl enable docker
sudo systemctl start docker

3. Managing Docker as a Non-Root User

Add your user to the docker group so you do not have to type sudo before every docker command:

sudo usermod -aG docker $USER
# Log out and log back in to apply group membership

4. Verifying Docker Compose

Verify that Docker and Docker Compose v2 are operational:

docker --version
docker compose version

5. Deploying Your First Test Container

# Launch a test Nginx container on port 8080
docker run -d -p 8080:80 --name test-web nginx:alpine

# Visit http://YOUR_SERVER_IP:8080 in your browser to verify!