containernet

Spin up and interact with virtual networks using Containernet and Node.js

npm install containernet

This module is a fork of @mafintosh mininet altered to work with Containernet

Usage

var containernet = require('containernet')
var cn = containernet()

var s1 = cn.createSwitch()
var d1 = cn.createHost({image: 'ubuntu:trusty', cmd: '/bin/bash'})
var d2 = cn.createHost({image: 'ubuntu:trusty', cmd: '/bin/bash'})

d1.link(s1)
d2.link(s1)

cn.start(function () {
  console.log('containernet started')
  console.log(`d2 ${d2.ip} ${d2.mac}`)
  // Test connectivity
  d1.exec(`ping -c 2 ${d2.ip}`, function (err, stream) {
    if (err) {
      console.log(err)
    } else {
      stream.pipe(process.stdout)
    }
    // Stop containernet
    cn.stop()
  })
})

process.on('SIGINT', function () {
  cn.stop()
})

API

var cn = containernet([options])

Create a new containernet instance. Options include

{
  clean: false,         // if true run mn -c first
  sudo: true,           // use sudo if needed 
  sock: '/tmp/mn.sock', // explictly set the .sock file used
  debug: false,         // set to true to enable debug output
}

If for some reason your containernet instance stops working you probably wanna try using clean: true.

cn.start([callback])

Start the containernet network. Usually you call this after defining your hosts, switches and links.

After the network has fully started start is emitted.

cn.stop([callback])

Stop the containernet network. You should not call any other methods after this.

After the network has fully stopped stop is emitted.

cn.switches

Array of all created switches.

cn.hosts

Array of all created hosts.

var sw = cn.createSwitch()

Create a new switch

sw.link(other, [options])

Link the switch with another switch or host. Options include:

{
  bandwidth: 10,  // use 10mbit link
  delay: '100ms', // 100ms delay
  loss: 10,       // 10% package loss
  htb: true       // use htb
}

var host = cn.createHost([options])

Create a new host. Options include

{
  image: 'alpine',      // docker image to use for the host 
  cmd: '/bin/bash'     // cmd to run on the newly created container 
}

host.ip

The IP address of the host. Populated after the network is started.

host.mac

The MAC address of the host. Populated after the network is started.

host.link(other, [options])

Link the host with another host or switch. Takes the same options as sw.link.

host.exec(cmd, [callback])

Execute a docker exec command and return the stream in the callback.

License

MIT