server.js

var express = require('express');
var exec = require('child_process').exec;
var app = express();

// Return a 200 for kubernetes healthchecks
app.get('/healthz', function(req, res){
  res.status(200).end();
});

app.get('/', function(req, res){
  var poweredBy = process.env.POWERED_BY;
  var release = process.env.WORKFLOW_RELEASE;

  if (typeof(message) == "undefined") {
  	poweredBy = "Deis";
  }

  exec('hostname', function(error, stdout, stderr) {
    container = "unknown";
    // If exec was successful
    if (error == null) {
      container = stdout.trim();
    }

    res.send('Powered by ' + poweredBy + '\nRelease ' + release + ' on ' + container);
  });
});

/* Use PORT environment variable if it exists */
var port = process.env.PORT || 5000;
server = app.listen(port, function () {
  console.log('Server listening on port %d in %s mode', server.address().port, app.settings.env);
});