Docker’s Moby Project is an open-source framework and collection of reusable components for building container systems. Docker Engine is one container engine built from Moby; Moby itself is aimed primarily at system builders and contributors, not as a finished end-user application.
What Moby is
Moby is an open-source project created by Docker to enable and accelerate software containerization. It brings together components and tools that engineers can combine into container-based systems. Its component areas include build tools, a registry, orchestration, runtime, and related infrastructure. Moby’s repository describes it as a modular toolkit; the project site explains the structure as components, assembly tools, and reference assemblies.
Components, assembly tools, and reference systems
- Components: Reusable pieces for container-system needs, with defined functions and APIs.
- Assembly tools: Tools for combining components into runnable artifacts for different platforms and architectures.
- Reference assemblies: Example systems that builders can use, modify, or learn from.
The modular approach allows a system to start with useful defaults and swap components for alternatives. Moby is therefore most relevant when you are building or adapting container infrastructure, not simply looking for a beginner-facing way to develop or run an application.
How Moby differs from Docker Engine
Moby and Docker Engine are related, but they are not interchangeable products or equivalent alternatives. Moby is the upstream open-source project and framework; Docker Engine is a container engine built from its codebase. Docker’s repository says it uses Moby upstream and invites other projects to reuse Moby components. The root Go module, github.com/moby/moby/v2, is the codebase for building container engines such as Docker Engine.
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| Aspect | Moby | Docker Engine |
|---|---|---|
| Role | Open-source project, component collection, and framework for assembling container systems. | A container engine built from the Moby codebase. |
| Typical audience | System builders, engineers, integrators, and contributors modifying or assembling container infrastructure. | People who want to run Docker’s container engine. |
| Support context | Community project with best-efforts support; not a place for Docker-product support requests. | Support, if needed, depends on the specific Docker product or offering. |
| Packaging | Components and related software may be packaged by different distributors under different names. | A downstream engine/product with its own release and distribution context. |
Docker announced Moby on April 18, 2017, as a project for collaborating on reusable components and assemblies for specialized container systems. That launch explains the upstream role; the current relationship is described in the Moby repository.
Who Moby is for—and what it does not provide
The project is intended for engineers, integrators, and enthusiasts who want to modify, fix, experiment with, or build systems based on containers. It is developer-focused, with APIs and documentation for people building tools and systems.
Moby is not Docker Desktop, Docker Hub, or a general commercial support service. The repository explicitly says it is not a location for support or feature requests for Docker products. Moby releases are supported on a best-efforts basis by maintainers, community members, and users. A commercial support need should be evaluated against the current terms and availability of the specific product or provider; product names and support offerings can change.
How Moby-related software appears in distributions
You may encounter Moby-derived software without seeing “Moby” in the package name. The project’s packager documentation says independent distributors package it, often under names such as docker or docker.io. Its non-exhaustive examples include Docker Inc. (Docker CE), Mirantis (Mirantis Container Runtime), Microsoft (CBL-Mariner Linux), and AWS (Amazon Linux). These examples do not establish current support or package availability for every release. Check the documentation for your specific operating system and package before installing or relying on it.
Not every associated component is governed by Moby. The project site identifies runc as owned by the Open Container Initiative and containerd and Notary as owned by the Cloud Native Computing Foundation. Component stewardship can therefore differ from the project that assembles or uses it.
What developers should know about Moby’s Go modules
The repository separates the Moby core library, Docker Engine, API module, and client module into separately versioned areas. Its documentation identifies master as the development branch for future releases, so it should not be treated as a stable release reference.
- The root module,
github.com/moby/moby/v2, produces binaries and is not intended to be imported as a Go library. - The documented public modules include
github.com/moby/moby/clientfor the Docker Engine API client andgithub.com/moby/moby/apifor shared API types. - The repository says Docker v29 deprecated the older
github.com/docker/dockerGo module and that it will not be updated. Its migration guidance should be consulted before changing imports because the repository reports breaking API changes in v29.
Module organization and release status are version-sensitive. Check the current repository documentation and its migration notes for the exact version you are targeting rather than relying on an older import path or a branch name.
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