Docker made containers mainstream; Podman, backed by Red Hat, offers a largely compatible alternative with a different architecture. This Podman vs Docker comparison helps you choose for your VPS or development machine.
Before you start
- Basic container knowledge; see containers vs virtual machines.
- A Linux VPS (any KVM VPS works).
Architecture
- Docker: a central daemon (
dockerd) runs as root and manages all containers; the CLI talks to it over a socket. - Podman: daemonless. Each
podmancommand starts containers directly as child processes, using conmon to monitor them.
Comparison
| Docker | Podman | |
|---|---|---|
| Daemon | Yes | No |
| Rootless containers | Supported (rootless mode) | Default focus, very mature |
| CLI | docker | Mostly identical (alias docker=podman works for many tasks) |
| Pods (Kubernetes-style) | No | Yes |
| systemd integration | Restart policies | Quadlet unit files, native systemd services |
| Compose | Docker Compose | podman compose / podman-compose, or the Docker Compose tool against Podman's API socket |
| Default on | Ubuntu/Debian users often install Docker | RHEL, AlmaLinux, Rocky, Fedora |
Security differences
- Docker's root daemon means anyone with access to the Docker socket effectively has root. Never expose it.
- Podman rootless runs containers as your user via user namespaces, limiting damage if a container is compromised.
- Both support SELinux/AppArmor, seccomp and capability dropping.
Install Podman
sudo apt install -y podmanAlmaLinux/Rocky: sudo dnf install -y podman. Run a container as a normal user:
podman run -d --name web -p 8080:80 docker.io/library/nginxUse fully qualified image names (docker.io/...) or configure registries in /etc/containers/registries.conf.
Run containers as systemd services (Quadlet)
Create ~/.config/containers/systemd/web.container:
[Container]
Image=docker.io/library/nginx
PublishPort=8080:80
[Install]
WantedBy=default.targetsystemctl --user daemon-reload && systemctl --user start webEnable lingering so user services start at boot: loginctl enable-linger $USER.
Which should you use?
- Docker: largest ecosystem, Docker Compose workflows, most tutorials (see Docker and Portainer).
- Podman: RHEL-family servers, rootless security, systemd-managed services, Kubernetes-style pods.
Troubleshooting
- Rootless cannot bind port 80: unprivileged ports start at 1024; use a reverse proxy or lower
net.ipv4.ip_unprivileged_port_start. - Short image names fail: use the full registry path.
- Containers stop after logout: enable lingering.
Frequently asked questions
Can Podman run Docker images?
Yes, both use OCI images from the same registries.
Can I install both?
Yes, but avoid confusion about which one manages a container.
Does Kubernetes use Docker or Podman?
Neither directly; Kubernetes uses containerd or CRI-O. See k3s basics.