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Sysbox

Free#12 of 31 in Container EnginesContainer Runtime Software

Sysbox: A focused runtime for running Docker, Kubernetes, and build workloads inside containers. Ranked #12 of 31 in Container Engines by our editors (8.1/10); pricing: Free plan; best for running nested Docker and Kubernetes workloads.

8.1/10Editor score
Visit Sysbox
Sysbox8.1 Visit Sysbox

At a glance

  • Editor score
    8.1 / 10
  • Pricing
    Free plan
  • Best for
    Running nested Docker and Kubernetes workloads
  • Free plan
    Yes
  • Paid from
    Free
  • Rootless mode
    Yes
  • Facts checked
    22 Sep 2026
Sysbox screenshot

  • Where it wins

    • Supports Docker-in-Docker, Kubernetes-in-Docker, K3s, and BuildKit
    • Provides rootless isolation with root mapped to an unprivileged host user
    • Integrates with Docker, Kubernetes, containerd, and CRI-O

  • Where it doesn't

    • Linux-only runtime; Windows containers are not supported
    • Some Linux distributions have source-build or work-in-progress installation status
    • Docker does not officially support the project

Our verdict on Sysbox

Sysbox is an open-source Linux container runtime for teams that need to run system-level workloads inside containers. Its VM-like system containers support systemd, Docker, Kubernetes, K3s, BuildKit, and legacy applications without requiring privileged containers. The runtime is aimed at platform engineers, CI environments, development teams, and infrastructure operators working with nested container or Kubernetes workloads.

Its main distinction is the depth of system-container behavior. Sysbox combines Linux namespaces and user namespaces with procfs and sysfs virtualization, immutable initial mount restrictions, and selective system-call interception. Root can be mapped to an unprivileged host user, while container image preloading can use a Dockerfile or docker commit. These capabilities support Docker-in-Docker, Kubernetes-in-Docker, K3s clusters inside system containers, and Buildx or BuildKit execution inside containers or Kubernetes pods.

Sysbox fits environments built around Docker, Kubernetes, containerd, or CRI-O, and its documented host coverage includes Ubuntu, Debian, Fedora, Rocky Linux, Alma Linux, CentOS Stream, Amazon Linux, Red Hat Enterprise Linux, and Flatcar. The focus is specialized rather than broad: teams running conventional application containers may not need its system-container model. It also runs on Linux hosts only, and installation status varies across documented distributions, with some requiring source builds or having work-in-progress support. Choose Sysbox when nested workloads and stronger isolation are central requirements; choose another runtime when Windows containers or a simpler, general-purpose container setup is the priority.

Your product? Our editors can test Sysbox in depth and publish a review, labelled as paid · from $149/mo →

Sysbox pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on github.com

Sysbox fact sheet

Free planYes
Paid fromFree
Rootless modeYes
Image buildingYes
Kubernetes CRINot verified
Windows containersNo
Image formatOci
Runtime interfaceOther
Supported host OSUbuntu 24.04, Ubuntu 22.04, Ubuntu 20.04, Ubuntu 18.04, Debian 11, Debian 10, Fedora 34–37, Rocky Linux 8, AlmaLinux 8–9, CentOS Stream, Amazon Linux 2, Amazon Linux 2023, Red Hat Enterprise Linux, Flatcar
DeploymentSelf-hosted
PlatformsLinux
SupportCommunity, Docs
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations4 integrations: Docker, Kubernetes, Docker Compose, CRI-O
PricingFree plan
Websitegithub.com
Facts checked22 Sep 2026

Sysbox integrations

Sysbox lists 4 integrations on its own site.

  • Docker
  • Kubernetes
  • Docker Compose
  • CRI-O

Alternatives to Sysbox

See all Sysbox alternatives →

Also Ranked In

Sysbox is ranked in 2 of our directories.

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Featured on iTechGuides

Featured on iTechGuides — Sysbox 8.1/10

Sysbox is listed in our Container Engines directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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