old_contents: var Promise = require('bluebird'),
      ini = require('ini'),
      fs = require('fs'),
      cp = require('child_process');
  
  Promise.promisifyAll(fs);
  Promise.promisifyAll(cp);
  
  function createPoolFile(hostname, data) {
      return fs.writeFile('/etc/php/7.0/fpm/pool.d/' + hostname + '.conf', data);
  }
  
  function removePoolFile(hostname) {
      return fs.unlink('/etc/php/7.0/fpm/pool.d/' + hostname + '.conf');
  }
  
  function reboot() {
      return cp.exec('service php7.0-fpm restart');
  }
  
  module.exports = {
  
      create: function(hostname, user) {
          var data = ini.encode({
              user: user,
              group: user,
              listen: '/run/php/' + hostname + '.sock',
              'listen.owner': 'www-data',
              'listen.group': 'www-data',
              pm: 'dynamic',
              'pm.max_children': 5,
              'pm.start_servers': 2,
              'pm.min_spare_servers': 1,
              'pm.max_spare_servers': 3
          }, {
              section: hostname
          });
          return createPoolFile(hostname, data)
              .then(reboot.bind(this));
      },
  
      remove: function(hostname) {
          return removePoolFile(hostname)
              .then(reboot.bind(this));
      }
  
  };
  
new_contents: var Promise = require('bluebird'),
      ini = require('ini'),
      fs = require('fs'),
      cp = require('child_process');
  
  Promise.promisifyAll(fs);
  Promise.promisifyAll(cp);
  
  function createPoolFile(hostname, data) {
      return fs.writeFile('/etc/php/7.0/fpm/pool.d/' + hostname + '.conf', data);
  }
  
  function removePoolFile(hostname) {
      return fs.unlink('/etc/php/7.0/fpm/pool.d/' + hostname + '.conf');
  }
  
  function reboot() {
      return cp.exec('service php7.0-fpm restart');
  }
  
  module.exports = {
  
      create: function(hostname, user) {
          var data = ini.encode({
              user: user,
              group: user,
              listen: '/run/php/' + hostname + '.sock',
              'listen.owner': 'www-data',
              'listen.group': 'www-data',
              pm: 'dynamic',
              'pm.max_children': 5,
              'pm.start_servers': 2,
              'pm.min_spare_servers': 1,
              'pm.max_spare_servers': 3,
              'php_admin_value[open_basedir]': '/var/www/vhosts/' + hostname
          }, {
              section: hostname
          });
          return createPoolFile(hostname, data)
              .then(reboot.bind(this));
      },
  
      remove: function(hostname) {
          return removePoolFile(hostname)
              .then(reboot.bind(this));
      }
  
  };
  
subject: add open_basedir