A wrapper that lets you run tasks in containers using runc. It will by default run a specific command in a container with the current working directory mounted in it.

Setup

1: Get your image, this can be either a docker image directly, or a container image.

As per runc, you need to create your container images using docker:

$ docker create python:buster
$ docker export [ID FROM ABOVE] > python-buster.tar

Of you can take the image directly:

$ docker save python:buster > python-buster.tar

2: Configuration file

You then need a config file that maps container images to commands, for example:

{
	"images": {
		"pythonbuster": {
			"rootfs": "/path/to/python-buster.tar",
			"tags": ["python3", "python", "buster"]
		}
	},
	"commands": {
		"mypython3": {
			"image": "pythonbuster",
			"mounts": [
				"/scratch"
			],
			"command": "python3"
		},
		"mysh": {
			"image": "pythonbuster",
			"mounts": [
				"/scratch"
			],
			"environment": {
				"HOST_KEY": "1234ABCD",
				"LOG_PATH": "/scratch/logs"
			},
			"networking": "host",
			"command": "bash"
		}
	}
}

This is currently looked for in /var/ark/config.json.

Install with symlinks

The go build process will create fsark as a binary. You then symlink to this with the name of the command you want it to use from the config file when run:

$ go build
$ sudo cp fsark /usr/local/bin
$ sudo ln -s /usr/local/bin/fsark /usr/local/bin/mypython3