https://github.com/ejunjsh/d

🍌 a simple container creation ,execution tools like docker cli
https://github.com/ejunjsh/d

docker golang

Last synced: 3 months ago
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🍌 a simple container creation ,execution tools like docker cli

• Host: GitHub
• URL: https://github.com/ejunjsh/d
• Owner: ejunjsh
• Created: 2018-12-05T05:29:55.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-04-08T05:46:39.000Z (about 6 years ago)
• Last Synced: 2024-12-29T08:41:59.297Z (4 months ago)
• Topics: docker, golang
• Language: Go
• Homepage:
• Size: 197 KB
• Stars: 2
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# d

[![Build Status](https://travis-ci.org/ejunjsh/d.svg?branch=master)](https://travis-ci.org/ejunjsh/d)

my docker container practice

## precondition

you need to install `docker`  and `iptables` commandline tools

enable ip forwarding 

    sysctl net.ipv4.conf.all.forwarding=1

## install

    go get github.com/ejunjsh/d/cmd/d

   

## usage

    NAME:

       d - a simple container runtime implementation.

             The purpose of this project is to learn how docker works and how to write a docker by ourselves

             Enjoy it, just for fun.

    

    USAGE:

       d [global options] command [command options] [arguments...]

    

    VERSION:

       0.0.0

    

    COMMANDS:

         init     Init container process run user's process in container. Do not call it outside

         run      Create a container with namespace and cgroups limit ie: d run -ti [image] [command]

         ps       list all the containers

         exec     exec a command into container

         rm       remove unused containers

         network  container network commands

         install  install an image into d

         help, h  Shows a list of commands or help for one command

    

    GLOBAL OPTIONS:

       --help, -h     show help

       --version, -v  print the version

## example

notice: this example is run at `Ubuntu 18.04.2 LTS` and the `d` is tested in this environment only. 

I'm not sure if `d` is compatible all the linux distribution.

### create nginx container

    # docker create nginx

    Unable to find image 'nginx:latest' locally

    latest: Pulling from library/nginx

    f7e2b70d04ae: Pull complete 

    08dd01e3f3ac: Pull complete 

    d9ef3a1eb792: Pull complete 

    Digest: sha256:98efe605f61725fd817ea69521b0eeb32bef007af0e3d0aeb6258c6e6fe7fc1a

    Status: Downloaded newer image for nginx:latest

    a46332a8ebfae2c83365affbdfe2cd285894c85563d6c898665816f3b7609b47

    

notice the last line of output, it is a container id

    

### generate tar archive 

    # docker export a46332a8ebfae2c83365affbdfe2cd285894c85563d6c898665816f3b7609b47 > nginx.tar

    

use the container id to generate the tar

### install tar archive into d

     

    # d install nginx.tar

    

### run a container with d

    # d run -i nginx bash

    missing mydocker_pid env skip nsenter

    {"level":"info","msg":"createTty true","time":"2019-03-13T17:39:00+08:00"}

    {"level":"info","msg":"dirs=/var/lib/d/c/1672401789/writeLayer:/var/lib/d/i/nginx","time":"2019-03-13T17:39:00+08:00"}

    missing mydocker_pid env skip nsenter

    {"level":"info","msg":"command all is bash","time":"2019-03-13T17:39:00+08:00"}

    {"level":"info","msg":"init come on","time":"2019-03-13T17:39:00+08:00"}

    {"level":"info","msg":"Current location is /var/lib/d/c/1672401789/mnt","time":"2019-03-13T17:39:00+08:00"}

    {"level":"info","msg":"Find path /bin/bash","time":"2019-03-13T17:39:00+08:00"}

    root@1672401789:/#

    

you will see it returns a bash and the host name is the container name `1672401789`

    

## reference

https://github.com/xianlubird/mydocker