dBox

dBox is a lightweight container runtime written in Go that showcases core containerization principles using Linux namespaces such as UTS, PID, filesystem namespaces, cgroups, and union file systems. It provides isolated environments for executing commands, simulating basic container behavior. To prevent resource misuse, cgroup controllers are implemented. Users can pull container images from Docker Hub's official library and recreate the image layers.

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Features

• Custom container runtime: Built with namespaces, cgroups, and union file systems.
• Isolated environments: Execute commands in a secure, containerized space.
• Image management: Pull and run container images from Docker Hub's official library.

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Requirements

• Go (version 1.16 or later)
• Linux-based OS
• Root user permissions

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Setup

1. Install Go

Download and install Go from the official Go website.

2. Clone the Repository

Clone the repository and navigate to the project directory:

git clone https://github.com/momed-0/dBox
cd dBox

3. Configure cgroup Controller

To manage resources, set up a cgroup controller in /sys/fs/cgroup/ and configure the cgroup.subtree_control file:

mkdir /sys/fs/cgroup/dBox.slice
ls /sys/fs/cgroup/dBox.slice
echo "+cpu +memory -io" > /sys/fs/cgroup/<parent>/cgroup.subtree_control

4. Build the dBox CLI

Compile the dBox CLI program:

go build -o dBox cmd/main.go

This will create an executable named dBox in the project directory.

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Usage

Once compiled, dBox allows you to execute commands in an isolated container environment.

Running a Command

To run a command in a containerized environment:

sudo ./dBox run <image_name> <command> [args...]
sudo ./dBox run <image_name>:<tag (optional)> <command> [args...]

• Root permissions are required.
• Commands inside the container are executed as a non-root user.

Example:

Run a shell in an isolated environment (assuming the Ubuntu image is already pulled):

sudo ./dBox run ubuntu /bin/bash
sudo ./dBox run ubuntu:20.04 /bin/bash

Pulling an Image

To pull an image from the official Docker library (Docker Official Images):

sudo ./dBox pull <image_name>

Example:

sudo ./dBox pull archlinux
sudo ./dBox pull archlinux:latest
sudo ./dBox pull ubuntu:20.04

Listing Local Images

To list all locally stored images:

sudo ./dBox images

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TODO

• Data Volume Containers
• Data Volumes
• Automatically clean up temporary files (currently reset on reboot).
• Implement a single command to pull and run an image.
• Add networking support using the network namespace.
• Provide an option to remove locally stored images.

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License

This project is licensed under the GNU General Public License v3.0. See the LICENSE file for more details.