jkrun

Purpose

A rather clumsy container runtime written for fun in bash...just because...

Disclaimer - This is a work-in-progress

Many limitations and bugs and probably many breaking changes will be introduced frequently. You've been warned!

Compatibility

Very limited compatibility.

Developed and tested for use with Ubuntu 20.04 host and Alpine rootfs tar file.

Usage

Add jkrun bash script to $PATH or symlink

Run jkcontainer from tar file

sudo jkrun -r path/to/image.tar cmdtoexec

Create a tar from an existing image

user@ubuntu:~$ podman export $(podman create alpine:3.5) -o alpine35.tar

user@ubuntu:~$ sudo jkrun -r alpine35.tar /bin/sh
|jkrun-> 7430
/ # hostname
jkrun
/ # ps
PID   USER     TIME   COMMAND
    1 root       0:00 /bin/sh
   42 root       0:00 ps
/ # exit
|jkrun-> Thanks, come again!

Run with very basic network setup

sudo jkrun -nr path/to/image.tar /bin/sh

user@ubuntu:~$ sudo jkrun -nr alpine35.tar /bin/sh
|jkrun-> 9276
|jkrun-> Host IP: 192.168.3.200
|jkrun-> Container IP: 192.168.3.100
/ # 

Startup previously created jkcontainer

sudo jkrun -s [container id] cmdtoexec

user@ubuntu:~$ sudo jkrun -s 9276 /bin/sh
|jkrun-> starting container "9276"
|jkrun-> 9276
/ # 

Start previously created container with very basic network setup add -n flag

List all created jkcontainers

jkrun -l

user@ubuntu:~$ jkrun -l
|jkrun-> Containers:
|jkrun->             1063
|jkrun->             1390
|jkrun->             1621

Delete jkcontainer

sudo jkrun -d [container id] [container id]

user@ubuntu:~$ sudo jkrun -d 9120
|jkrun-> deleted container "9120"

Delete ALL jkcontainers

sudo jkrun -D

user@ubuntu:~$ sudo jkrun -D
|jkrun-> deleted container "4632"
|jkrun-> deleted container "4955"
|jkrun-> deleted container "4995"
|jkrun-> deleted container "5377"