Overview
| Parameter | Docker | Podman |
|---|---|---|
| Architecture | Client-Server (Daemon) | Daemonless (fork-exec) |
| Rootless mode | Requires complex setup | Native by default |
| Grouping | Containers | Pods (Kubernetes-like) |
| Management | Docker CLI | Podman CLI (compatible) |
| Dependencies | dockerd, containerd | libpod, conmon |
Docker is a monolithic platform where a background process (dockerd) handles all operations. Podman (Pod Manager) implements a modular approach, running containers as direct child processes of the shell or system manager, eliminating the daemon as a single point of failure.
Performance
Docker has an advantage in command execution speed due to the persistent daemon. Response time for docker run averages 50-100ms. Podman initializes the environment with each call, which takes 150-250ms in rootless mode.
Regarding resource consumption, the Docker daemon consistently occupies 60-100MB of RAM at idle. Podman consumes no memory when containers are not running, but each active container requires a conmon monitor process, using approximately 3-5MB of RAM.
Configuration & complexity
Podman provides full CLI compatibility. The alias docker=podman command allows using familiar scripts. The main difference lies in autostart management: Docker uses the --restart flag, while Podman delegates this to the system manager by generating unit files:
podman generate systemd --name my-containerThis enables standard Linux tools (systemctl) for dependency management and service monitoring.
When to choose what
- Docker: Development on Windows/macOS via Docker Desktop; Docker Swarm usage; complex CI/CD pipelines tied to Docker Socket.
- Podman: High security requirements (Rootless); running containers in HPC clusters; preparing manifests for Kubernetes migration; RHEL/CentOS-based systems.
Cost / licensing
Docker Desktop is paid for companies with over $10M annual revenue or 250+ employees (Business subscription starts at $24/mo). Docker Engine remains Apache 2.0. Podman is completely free under the Apache 2.0 license with no commercial restrictions.
Ecosystem & integrations
Docker has a mature ecosystem: Docker Hub, Docker Compose, and built-in Swarm. Podman uses modular tools: Buildah for building images without a Dockerfile and Skopeo for inspecting and copying images between registries. Podman Desktop is available for local development.
Verdict
Docker remains the standard for cross-platform development and simple CI environments. Podman is the choice for Linux production servers where security (rootless operation) and native systemd integration are critical.