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Container

The applications' modern runtime: from single containers to orchestration — the Linux that becomes a platform.

FOCUS · FROM THE PROCESS TO THE PODPodman, well-made images and the orchestration: containerization with foundations
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01 · What it is

Container — Podman & Kubernetes, made clear.

Containers are Linux packaged well: Podman (daemonless, rootless: the secure default), images built with judgment (small, signed, no secrets inside) and, when the services grow, the orchestration — from systemd+Quadlet for the small to Kubernetes/OpenShift for the big. Modernization starts here.

Rootless
the containers without root: security by default with Podman
OCI
standard images: built once, they run everywhere
Quadlet→K8s
the right scale: systemd for the simple, the orchestrator for the complex
Container — Podman & Kubernetes
OFFICIAL LINUX BRANDING · CONTAINERS
INTERFACCIA REALE · PODMAN DESKTOP · FONTE: PODMAN
REAL INTERFACE · PODMAN DESKTOP · SOURCE: PODMAN
02 · How to use it well

The things that make the difference.

The scale

The applicationfrom the ERP to the microservice
Single Podman
Compose/Quadlet
Kubernetes
one · a few · fleets
Registry & CIthe images governed
The Linux underneaththe foundations we know
The right container for the right size

Images with hygiene

Minimal bases, multi-stage, scanning and signing: the image is production software.

The right first workload

You containerize what gains from it (stateless apps, internal tools): not everything, not right away.

Systemd for the pragmatic

Quadlet for the counted services: the containers' benefits without K8s's weight.

The route toward the orchestration

When the containers multiply: the move to K8s/OpenShift planned, not immediate.

03 · In depth

The container runtime and the OCI chain

The container is a confined Linux process (namespaces+cgroups): Podman runs them rootless and daemonless (Docker's root socket disappears: the surface shrinks), Buildah builds the images, Skopeo moves them between registries, crun/runc are the OCI runtimes; the enterprise chain: minimal images (UBI, distroless), vulnerability scanning, signing (cosign) and SBOMs for the supply chain; systemd integrates the containers as services (Quadlet): the container without an orchestrator where it suffices.

  • Rootless — the containers without root: the daemon's compromise eliminated
  • Podman/Buildah/Skopeo — the daemonless triad: run, build, move
  • OCI standard — images portable everywhere: no runtime lock-in
  • Immagini minime — UBI and distroless: fewer packages, fewer CVEs
  • Firma & SBOM — cosign and bills of materials: the verifiable supply chain
  • Quadlet — the container as a systemd unit: light orchestration
04 · Numbers and lifecycle

The numbers that matter.

0
root daemon with Podman
-70%
the CVE surface with the minimal images
OCI
the standard: build once, run anywhere
systemd
the simple cases' orchestrator: K8s only where needed
Containers are adopted with the chain: images, registry and signing set up by us — the clean base before Kubernetes.
05 · Use cases

Where it really pays off.

App modernization

The legacy packaged, the new already native.

Internal tools and services

Reproducible deployments instead of the 'installed by hand'.

The base for K8s

The right practices before the orchestrator.

The container is Linux well packaged: we start from the foundations — and the scale comes by itself.