coal

Linux container like docker for learning purposes

Setup

1. If you don't have rust installed, follow the instructions here.

2. Clone and build the repository

git clone https://github.com/deep110/coal.git
cd coal && cargo build

3. Download alpine file system and unzip into folder named alpine. We will use this as a base image.

wget http://dl-cdn.alpinelinux.org/alpine/v3.9/releases/x86_64/alpine-minirootfs-3.9.4-x86_64.tar.gz
mkdir alpine && tar -xzf alpine-minirootfs-3.9.4-x86_64.tar.gz -C alpine

Running the container

If you are running from debug build:

sudo target/debug/coal run /bin/sh

In place of bash you can run any command that will be available in alpine by default.

Implemented [As shown in demo]

• A new process is started in run command
• Container has its own PID tree, host and network
• Limit on number of process using control groups

Reading Material / libc functions used

• Fork
• Clone
• Chroot
• Mount
• Clone

TODO

1. Making an exec command like docker.
2. Mounting additional volumes and folders.