Introduction

Container technology has matured rapidly, but in 2025, two tools still dominate conversations in developer communities: Docker and Podman. Both tools are built on OCI (Open Container Initiative) standards, meaning they can build, run, and manage the same types of images. However, the way they handle processes, security, and orchestration differs dramatically. This article breaks down everything developers need to know, from architectural design to CLI compatibility, performance, and security, with a focus on the latest changes in both ecosystems.

Architecture: Daemon vs. Daemonless

Docker's Daemon-Based Model

Docker uses a persistent background service, dockerd, to manage container lifecycles. The CLI communicates with this daemon, which supervises container creation, networking, and resource allocation. While this centralized approach is convenient, it introduces a single point of failure: if the daemon crashes, every running container goes down with it.

Podman’s Daemonless Approach

Podman flips the script. Instead of a single daemon, every container runs as a child process of the CLI command that started it. This design eliminates the need for a root-level service, which is appealing for environments concerned about attack surfaces. Containers continue to run independently even if the CLI session ends, and they can be supervised with systemd for long-term stability.

Developer Workflow and CLI

Familiar Command Structure

Podman was designed as a near drop-in replacement for Docker. Commands like podman run, podman ps, and podman build mirror their Docker equivalents, reducing the learning curve. Developers can often alias docker to podman and keep using their existing scripts.

Run an NGINX container

Docker

docker run -d --name web -p 8080:80 nginx:latest

Podman

podman run -d --name web -p 8080:80 nginx:latest

GUI Options

For desktop users, Docker Desktop remains polished and feature-rich. However, Podman Desktop has matured significantly. It now supports Windows and macOS with better integration, faster file sharing, and no licensing restrictions, making it appealing for enterprise environments.