Focker

Focker is a toy container runtime written in Go, designed to create and manage lightweight Linux containers.

Features

• Namespace Isolation: Uses Linux namespaces to isolate processes, mount points, and hostname.
• Filesystem Handling: Extracts a base Ubuntu 22.04 filesystem tarball for container use.
• Process Management: Runs specified commands inside isolated containers.
• Bind Mounts: Easy file and directory sharing between host and containers

Requirements

• Go (tested with go1.21.5)
• Linux kernel with support for namespaces (tested on Ubuntu 22.04, Pop!_OS)
• Requires root privileges to operate due to its use of Linux namespaces.

Usage

1. Building

   go build -o focker

2. Running Containers

   sudo ./focker run <command> [args...]

Resources

• Containers From Scratch • Liz Rice • GOTO 2018
• Ubuntu 22.04 Base (rootfs)
• pivot_root(2) — Linux manual page