rekcod

   

Reverse engineer a docker run command from an existing container (via docker inspect).

rekcod can turn any of the following into a docker run command:

1. container ids/names (rekcod will call docker inspect)
2. path to file containing docker inspect output
3. raw JSON (pass the docker inspect output directly)

Each docker run command can be used to duplicate the containers.

This is not super robust, but it should cover most arguments needed. See Fields Supported below.

When passing container ids/names, this module calls docker inspect directly, and the user running it should be able to as well.

(If you didn't notice, the dumb name for this package is just "docker" in reverse.)

Install and Usage

CLI

If you have Node installed:

$ npm i -g rekcod

If you only have Docker installed:

$ docker pull nexdrew/rekcod
$ alias rekcod="docker run --rm -v /var/run/docker.sock:/var/run/docker.sock nexdrew/rekcod"

Or you can simply run this, no installation required:

$ docker run --rm -v /var/run/docker.sock:/var/run/docker.sock nexdrew/rekcod <container>

Containers

# containers as arguments
$ rekcod container-one 6653931e39f2 happy_torvalds

docker run --name container-one ...

docker run --name stinky_jones ...

docker run --name happy_torvalds ...

# pipe in containers
$ docker ps -aq | rekcod

docker run --name container-one ...

docker run --name stinky_jones ...

docker run --name happy_torvalds ...

Files

# file names as arguments
$ docker inspect container-one > one.json
$ docker inspect 6653931e39f2 happy_torvalds > two.json
$ rekcod one.json two.json

docker run --name container-one ...

docker run --name stinky_jones ...

docker run --name happy_torvalds ...

# pipe in file names
$ docker inspect container-one > one.json
$ docker inspect 6653931e39f2 happy_torvalds > two.json
$ ls *.json | rekcod

JSON

$ docker inspect container-one 6653931e39f2 | rekcod

docker run --name container-one ...

docker run --name stinky_jones ...

Module

$ npm i --save rekcod

Containers via async reckod()

const rekcod = require('rekcod')
// single container
rekcod('container-name', (err, run) => {
  if (err) return console.error(err)
  console.log(run[0].command)
})
// multiple containers
rekcod(['another-name', '6653931e39f2', 'happy_torvalds'], (err, run) => {
  if (err) return console.error(err)
  run.forEach((r) => {
    console.log('\n', r.command)
  })
})

File via async rekcod.readFile()

const rekcod = require('rekcod')
rekcod.readFile('docker-inspect.json', (err, run) => {
  if (err) return console.error(err)
  run.forEach((r) => {
    console.log('\n', r.command)
  })
})

Parse a JSON string via sync rekcod.parse()

const fs = require('fs')
const rekcod = require('rekcod')
let array
try {
  array = rekcod.parse(fs.readFileSync('docker-inspect.json', 'utf8'))
} catch (err) {
  return console.error(err)
}
array.forEach((r) => {
  console.log('\n', r.command)
})

Fields Supported

rekcod will translate the following docker inspect fields into the listed docker run arguments.

docker inspect	docker run
Name	--name
HostConfig.Binds	-v
HostConfig.VolumesFrom	--volumes-from
HostConfig.PortBindings	-p
HostConfig.Links	--link
HostConfig.PublishAllPorts	-P
HostConfig.NetworkMode	--net
HostConfig.RestartPolicy	--restart
HostConfig.ExtraHosts	--add-host
Config.Hostname	-h
Config.ExposedPorts	--expose
Config.Env	-e
Config.Attach* !== true	-d
Config.AttachStdin	-a stdin
Config.AttachStdout	-a stdout
Config.AttachStderr	-a stderr
Config.Tty	-t
Config.OpenStdin	-i
Config.Entrypoint	--entrypoint
Config.Image || Image	image name or id
Config.Cmd	command and args

Prior to version 0.2.0, rekcod always assumed -d for detached mode, but it now uses that only when all stdio options are not attached. I believe this is the correct behavior, but let me know if it causes you problems. A side effect of this is that the -d shows up much later in the docker run command than it used to, but it will still be there. ❤

from https://github.com/nexdrew/rekcod