Running Rootless Podman as a Docker Alternative

What Is Podman?

Podman is a daemonless container engine that is compatible with Docker CLI commands. Its key advantage is running containers without root privileges, improving security.

Install Podman

# Ubuntu 22.04+
sudo apt install -y podman

# Rocky/Alma Linux
sudo dnf install -y podman

Basic Usage (Same as Docker)

podman run -d --name web -p 8080:80 nginx
podman ps
podman logs web
podman stop web
podman rm web

Rootless Containers

Podman runs containers as your regular user by default — no daemon, no root required:

# As regular user (no sudo)
podman run -d -p 8080:80 nginx
podman images
podman ps

Podman Compose

pip3 install podman-compose

# Use existing docker-compose.yml files
podman-compose up -d
podman-compose down

Generating Systemd Services

Podman can generate systemd unit files for container management:

# Generate a service file
podman generate systemd --new --name web > ~/.config/systemd/user/container-web.service

# Enable and start
systemctl --user daemon-reload
systemctl --user enable --now container-web.service

# Auto-start on boot (even without login)
loginctl enable-linger $USER

Key Differences from Docker

Docker Compatibility

# Alias for seamless transition
alias docker=podman

Most Docker commands work identically with Podman. The main exceptions are Docker Swarm features and certain network plugins.