# What Is the Apple Container Tool Used For?

> Discover the Apple container tool for creating managing and running Linux containers on Apple Silicon Macs. Enjoy VM isolation with Docker speed and low memory usage.

- Repository: [Apple/container](https://github.com/apple/container)
- Tags: getting-started
- Published: 2026-07-03

---

**The Apple container tool is a Swift-based command-line utility that lets you create, run, and manage Linux containers on Apple Silicon Macs using lightweight virtual machines that provide the isolation of traditional VMs with the speed and low memory footprint of Docker-style containers.**

The `apple/container` repository provides this native containerization solution designed specifically for macOS. Instead of launching full virtual machines, the tool leverages the open-source **Containerization** package to run each container inside a lightweight VM, delivering efficient isolation without the performance overhead of conventional virtualization.

## Core Capabilities of the Apple Container Tool

The Apple container tool bridges the gap between VM isolation and container performance through several distinct capabilities.

### Run OCI-Compatible Images

The tool pulls and executes images from any **OCI-compatible container registry**, including Docker Hub. According to the [`README.md`](https://github.com/apple/container/blob/main/README.md), each container runs inside a lightweight VM provided by the Containerization package, giving you robust isolation while maintaining fast startup times and minimal resource usage.

### Build Images with BuildKit

You can build OCI images directly from a `Dockerfile` or `Containerfile` using the built-in **BuildKit integration**. As documented in [`docs/command-reference.md`](https://github.com/apple/container/blob/main/docs/command-reference.md), this build process occurs in isolation within the lightweight VM environment, ensuring consistent and reproducible builds.

### Persistent Container Machines

The **container-machine** feature creates persistent Linux environments that maintain state across starts and stops. Referenced in [`docs/container-machine.md`](https://github.com/apple/container/blob/main/docs/container-machine.md), these machines automatically map the host user's home directory into the container, providing a seamless development environment where files and configurations persist between sessions.

### System Service and Networking

The `container system` command manages a background daemon that handles VM lifecycle, networking, and storage. The tool uses **macOS 15's `vmnet` framework** to assign each container its own virtual network, isolating containers from each other while maintaining connectivity to the host system.

## How to Use the Apple Container Tool

The Apple container tool provides a familiar CLI interface optimized for Apple Silicon architecture.

### Start the System Daemon

Before running containers, initialize the background service that allocates lightweight VMs:

```bash
container system start

```

This launches the system daemon required for VM lifecycle management and resource allocation.

### Run a Container Interactively

Pull and execute images from any OCI registry:

```bash
container run -it alpine:latest /bin/sh

```

The `-it` flag allocates an interactive TTY. The image is fetched from Docker Hub and executed inside a lightweight VM.

### Build from a Containerfile

Build images using the integrated BuildKit engine:

```bash
container build -t myapp:1.0 .

```

This command looks for `Containerfile` or `Dockerfile` in the current directory and performs the build in isolation, as specified in [`docs/command-reference.md`](https://github.com/apple/container/blob/main/docs/command-reference.md).

### Create a Persistent Machine

For development environments requiring persistence:

```bash
container machine create -n devbox -i ubuntu:22.04
container machine start devbox

```

As detailed in [`docs/container-machine.md`](https://github.com/apple/container/blob/main/docs/container-machine.md), this creates a persistent machine named `devbox` based on Ubuntu 22.04 that maintains its filesystem across restarts with automatic home directory mounting.

### Use the Swift Library Programmatically

The same underlying libraries that power the CLI are exposed for Swift developers. In [`Sources/ContainerPersistence/ContainerSystemConfig.swift`](https://github.com/apple/container/blob/main/Sources/ContainerPersistence/ContainerSystemConfig.swift), the `ContainerManager` class provides the core API:

```swift
import Containerization

let manager = try ContainerManager()
let vm = try manager.createVM(with: .ubuntuLatest)
try vm.start()

```

This creates and starts a VM using the same low-level APIs available in the command-line tool.

## Architecture and Key Source Files

The Apple container tool is implemented in Swift and organized into modular components that demonstrate its system architecture.

### Package Configuration

The [`Package.swift`](https://github.com/apple/container/blob/main/Package.swift) file defines the Swift package manifest and dependencies, including the `Containerization` package that provides the underlying virtualization capabilities.

### Core Configuration and Persistence

In [`Sources/ContainerPersistence/ContainerSystemConfig.swift`](https://github.com/apple/container/blob/main/Sources/ContainerPersistence/ContainerSystemConfig.swift), the core configuration model defines guest kernel settings, DNS configuration, and system parameters that govern how lightweight VMs are provisioned and managed.

### Network Forwarding

The [`Sources/SocketForwarder/SocketForwarder.swift`](https://github.com/apple/container/blob/main/Sources/SocketForwarder/SocketForwarder.swift) file implements TCP and UDP forwarding between the host macOS system and container VMs, enabling network connectivity while maintaining isolation through the `vmnet` framework.

### Documentation Structure

Key architectural documentation includes:
- [`docs/technical-overview.md`](https://github.com/apple/container/blob/main/docs/technical-overview.md) - Describes how the tool leverages lightweight VMs
- [`docs/command-reference.md`](https://github.com/apple/container/blob/main/docs/command-reference.md) - Complete CLI command reference
- [`docs/container-machine.md`](https://github.com/apple/container/blob/main/docs/container-machine.md) - Specifications for persistent container machines

## Summary

The Apple container tool provides native Linux containerization for Apple Silicon Macs through these key features:

- **Lightweight virtualization** using the open-source Containerization package instead of resource-heavy VMs
- **OCI compatibility** for running standard container images from any registry
- **BuildKit integration** for building images from Dockerfiles and Containerfiles in isolated environments
- **Persistent container machines** that maintain state across reboots with automatic home directory mapping
- **Native Swift API** allowing programmatic container management via `ContainerManager` and related classes
- **macOS integration** using the `vmnet` framework and requiring macOS 26 or later for optimal performance

## Frequently Asked Questions

### What is the Apple container tool used for?

The Apple container tool is used to create, run, and manage Linux containers on Apple Silicon Macs. It provides a command-line interface for pulling OCI images, building containers from Dockerfiles, and managing persistent development environments, all while using lightweight VMs for isolation rather than full virtualization.

### How does the Apple container tool differ from Docker?

While Docker uses a daemon-based architecture with heavier virtualization layers on macOS, the Apple container tool leverages native macOS virtualization APIs and the `vmnet` framework to provide lightweight VM isolation. According to the architecture described in [`Sources/ContainerPersistence/ContainerSystemConfig.swift`](https://github.com/apple/container/blob/main/Sources/ContainerPersistence/ContainerSystemConfig.swift), it integrates deeply with macOS 26 or later for optimized performance on Apple Silicon.

### What are the system requirements for the Apple container tool?

The tool requires macOS 26 or later because it relies on newer virtualization and networking APIs. It is specifically designed for Apple Silicon Macs and utilizes the `vmnet` framework introduced in macOS 15 for virtual networking capabilities.

### Can I use the Apple container tool programmatically in Swift applications?

Yes, the tool exposes Swift APIs through the `Containerization` package. As shown in [`Sources/ContainerPersistence/ContainerSystemConfig.swift`](https://github.com/apple/container/blob/main/Sources/ContainerPersistence/ContainerSystemConfig.swift), you can import these libraries to instantiate `ContainerManager`, create VMs with specific configurations, and manage container lifecycle operations directly from Swift code without using the command-line interface.