diff --git a/Vagrantfile b/Vagrantfile
index 9e0c22ea..b351d918 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -1,492 +1,49 @@
 # -*- mode: ruby -*-
 # vi: set ft=ruby :
-require 'json'
-load File.dirname(__FILE__) + '/lib/utility.rb'
-load File.dirname(__FILE__) + '/lib/provisioner.rb'
-
-
-# Load default setting
-file = File.read(File.dirname(__FILE__) + '/vagrant_config.json')
-extension_list = [File.dirname(__FILE__) + '/Vagrantfile-ext.rb']
-data_hash = JSON.parse(file)
-override_hash = nil
-
-# Check and override if exist any match JSON object from vagrant_config_override.json
+require "rubygems"
+require 'yaml'
 
-begin
-  if File.exist?(File.dirname(__FILE__) + '/vagrant_config_override.json')
-    parsing_file = File.dirname(__FILE__) + '/vagrant_config_override.json'
-    override_file = File.read(parsing_file)
-    override_hash = JSON.parse(override_file)
+# teracy-dev version
+VERSION='0.6.0-a1-SNAPSHOT'
 
-    data_hash = overrides(data_hash, override_hash)
-  end
-
-  if File.exist?(File.dirname(__FILE__) + '/workspace/dev-setup/vagrant_config_default.json')
-    parsing_file = File.dirname(__FILE__) + '/workspace/dev-setup/vagrant_config_default.json'
+CONFIG_LOOKUP_PATH="workspace/dev-setup/" # will look for workspace/dev-setup/config_default.yaml
 
-    extension_list.push(File.dirname(__FILE__) + '/workspace/dev-setup/Vagrantfile-ext.rb')
 
-    org_config_file = File.read(parsing_file)
-    org_config_hash = JSON.parse(org_config_file)
-
-    override_config_file_path = parsing_file.gsub(/default\.json$/, "override.json")
-    if File.exist?(override_config_file_path)
-      override_config_file = File.read(override_config_file_path)
-      parsing_file = override_config_file_path
-      override_config_hash = JSON.parse(override_config_file)
-      org_config_hash = overrides(org_config_hash, override_config_hash)
-    end
-
-    if !org_config_hash.nil?
-      overrides(data_hash, org_config_hash)
-    end
-  end
+load File.dirname(__FILE__) + '/lib/utility.rb'
 
-  if data_hash['vagrant'] && data_hash['vagrant']['config_paths']
-    data_hash['vagrant']['config_paths'].map do |default_config_file_path|
-      override_config_file_path = default_config_file_path.gsub(/default\.json$/, "override.json")
+$logger = get_logger()
 
-      if File.exist?(File.dirname(__FILE__) + '/' + default_config_file_path)
-        default_config_file = File.read(File.dirname(__FILE__) + '/' + default_config_file_path)
-        extension_list.push(File.dirname(File.dirname(__FILE__) + '/' + default_config_file_path) + '/Vagrantfile-ext.rb')
-        parsing_file = default_config_file_path
-        project_config_hash = JSON.parse(default_config_file)
-      else
-        puts "[teracy-dev][INFO]: #{default_config_file_path} not found, make sure this is intended."
-      end
 
-      if File.exist?(File.dirname(__FILE__) + '/' + override_config_file_path)
-        override_config_file = File.read(File.dirname(__FILE__) + '/' + override_config_file_path)
-        parsing_file = override_config_file_path
-        override_config_hash = JSON.parse(override_config_file)
-        project_config_hash = overrides(project_config_hash, override_config_hash)
-      end
-      if !project_config_hash.nil?
-        overrides(data_hash, project_config_hash)
-      end
-    end
-  end
-rescue Exception => msg
-  puts red(msg)
-  puts red('from ' + parsing_file)
-  ans = prompt yellow("some errors have occured and '" + parsing_file + "' file will not be used, do you want to continue? [y/N]: ")
-  if ans.downcase != 'y'
-    exit!
+# learn from https://github.com/hashicorp/vagrant/blob/ee5656da37c75e896201d389c79da199114603c2/lib/vagrant.rb#L216
+def require_version(*requirements)
+  $logger.info("teracy-dev version: #{VERSION}")
+  req = Gem::Requirement.new(*requirements)
+  if req.satisfied_by?(Gem::Version.new(VERSION))
+      $logger.debug("version requirements satisfied!")
+      return
   end
+  $logger.error("teracy-dev version requirements: #{requirements}")
+  exit 1
 end
 
-Vagrant.configure("2") do |config|
-
-  vm_hash = data_hash["vm"]
-
-  # All Vagrant configuration is done here. The most common configuration
-  # options are documented and commented below. For a complete reference,
-  # please see the online documentation at vagrantup.com.
-
-  # Every Vagrant virtual environment requires a box to build off of.
-  config.vm.box = vm_hash["box"]
-
-  # The url from where the 'config.vm.box' box will be fetched if it
-  # doesn't already exist on the user's system.
-  config.vm.box_url = vm_hash['box_url']
 
-  # Other configs: https://docs.vagrantup.com/v2/vagrantfile/machine_settings.html
+settings = YAML.load_file(File.join(File.dirname(__FILE__), 'config_default.yaml'))
 
-  if !vm_hash["box_version"].nil? and !vm_hash["box_version"].strip().empty?
-    config.vm.box_version = vm_hash['box_version']
-  end
-
-  if !vm_hash["boot_timeout"].nil?
-    config.vm.boot_timeout = vm_hash['boot_timeout']
-  end
+Vagrant.require_version settings["vagrant"]["require_version"]
+require_version(settings['teracy-dev']['require_version'])
 
-  if !vm_hash["box_check_update"].nil?
-    config.vm.box_check_update = vm_hash['box_check_update']
-  end
-
-  if !vm_hash["box_download_checksum"].nil? and !vm_hash["box_download_checksum"].strip().empty?
-    config.vm.box_download_checksum = vm_hash['box_download_checksum']
-
-    # box_download_checksum_type must be specified if box_download_checksum is specified
-    config.vm.box_download_checksum_type = vm_hash['box_download_checksum_type']
-  end
-
-  if !vm_hash["box_download_client_cert"].nil? and !vm_hash["box_download_client_cert"].strip().empty?
-    config.vm.box_download_client_cert = vm_hash['box_download_client_cert']
-  end
-
-  if !vm_hash["box_download_ca_cert"].nil? and !vm_hash["box_download_ca_cert"].strip().empty?
-    config.vm.box_download_ca_cert = vm_hash['box_download_ca_cert']
-  end
+# process settings override mechanism here
 
-  if !vm_hash["box_download_ca_path"].nil? and !vm_hash["box_download_ca_path"].strip().empty?
-    config.vm.box_download_ca_path = vm_hash['box_download_ca_path']
-  end
-
-  if !vm_hash["box_download_insecure"].nil?
-    config.vm.box_download_insecure = vm_hash['box_download_insecure']
-  end
-
-  if !vm_hash["communicator"].nil? and !vm_hash["communicator"].strip().empty?
-    config.vm.communicator = vm_hash['communicator']
-  end
-
-  if !vm_hash["graceful_halt_timeout"].nil?
-    config.vm.graceful_halt_timeout = vm_hash['graceful_halt_timeout']
-  end
-
-  if !vm_hash["guest"].nil? and !vm_hash["guest"].strip().empty?
-    config.vm.guest = vm_hash['guest']
-  end
-
-  if !vm_hash["hostname"].nil? and !vm_hash["hostname"].strip().empty?
-    config.vm.hostname = vm_hash['hostname']
-  end
-
-  if !vm_hash["post_up_message"].nil? and !vm_hash["post_up_message"].strip().empty?
-    config.vm.post_up_message = vm_hash['post_up_message']
-  end
-
-  if !vm_hash["usable_port_range"].nil? and !vm_hash["usable_port_range"].strip().empty?
-    ranges = vm_hash['usable_port_range'].split('..').map{|d| Integer(d)}
-    config.vm.usable_port_range = ranges[0]..ranges[1]
-  end
-
-  # Create a forwarded port mapping which allows access to a specific port
-  # within the machine from a port on the host machine. In the example below,
-  # accessing "localhost:8080" will access port 80 on the guest machine.
-  vm_networks = vm_hash['networks']
-  vm_networks.each do |vm_network|
-    if vm_network['mode'] == 'forwarded_port'
-      vm_network['forwarded_ports'].each do |item|
-        config.vm.network :forwarded_port, guest: item['guest'], host: item['host']
-      end
-    else
-      options = {}
-      case vm_network['mode']
-      when 'private_network'
-        options[:ip] = vm_network['ip'] unless vm_network['ip'].nil? or vm_network['ip'].strip().empty?
-        if options[:ip].nil? or options[:ip].empty?
-          # make `type: 'dhcp'` default when `ip` is not defined (nil or empty)
-          options[:type] = 'dhcp'
-        else
-          options[:auto_config] = !(vm_network['auto_config'] == false)
-        end
-      when 'public_network'
-        options[:ip] = vm_network['ip'] unless vm_network['ip'].nil? or vm_network['ip'].strip().empty?
-
-        bridge_interface = ""
-        bridge_interface = vm_network['bridge'] unless vm_network['bridge'].nil? or vm_network['bridge'].empty?
-        bridge_interface = get_default_nic() if bridge_interface.empty? and vm_network['auto_bridge_default_network']
-        options[:bridge] = bridge_interface unless bridge_interface.empty?
-
-        if vm_network['reuse_mac_address']
-          if File.exist?(File.dirname(__FILE__) + '/.vagrant/.public_mac_address')
-            options[:mac] = File.read(File.dirname(__FILE__) + '/.vagrant/.public_mac_address').gsub(/[\s:\n]/,'')
-          else
-            FileUtils::touch File.dirname(__FILE__) + '/.vagrant/.public_mac_address'
-          end
-        else
-          if File.exist?(File.dirname(__FILE__) + '/.vagrant/.public_mac_address')
-            FileUtils.rm File.dirname(__FILE__) + '/.vagrant/.public_mac_address'
-          end
-        end
-      end
-
-      config.vm.network vm_network['mode'], options
-
-    end
-  end
-
-
-  # Create a private network, which allows host-only access to the machine
-  # using a specific IP.
-  # config.vm.network :private_network, ip: "192.168.33.10"
-
-  # Create a public network, which generally matched to bridged network.
-  # Bridged networks make the machine appear as another physical device on
-  # your network.
-  # config.vm.network :public_network
-
-  # Share an additional folder to the guest VM. The first argument is
-  # the path on the host to the actual folder. The second argument is
-  # the path on the guest to mount the folder. And the optional third
-  # argument is a set of non-required options.
-  # config.vm.synced_folder "../data", "/vagrant_data"
-
-  vm_hash['synced_folders'].each do |item|
-    options = {}
-    host_os = Vagrant::Util::Platform.platform
-    host_os_type = ''
-
-    case host_os
-    when /^(mswin|mingw).*/
-      host_os_type = 'windows'
-    when /^(linux|cygwin).*/
-      host_os_type = 'linux'
-    when /^(mac|darwin).*/
-      host_os_type = 'mac'
-    end
+$logger.debug("settings: #{settings}")
 
-    # options from http://docs.vagrantup.com/v2/synced-folders/basic_usage.html
-    options[:create] = item['create'] unless item['create'].nil?
-    options[:disabled] = item['disabled'] unless item['disabled'].nil?
-    options[:owner] = item['owner'] unless item['owner'].nil?
-    options[:group] = item['group'] unless item['group'].nil?
-    options[:mount_options] = item['mount_options'] unless item['mount_options'].nil?
-    options[:type] = item['type'] unless item['type'].nil? or item['type'] == 'virtual_box'
-
-    case item['type']
-    when 'nfs'
-      options[:nfs_export] = item['nfs_export'] if !!item['nfs_export'] == item['nfs_export']
-      options[:nfs_udp] = item['nfs_udp'] if !!item['nfs_udp'] == item['nfs_udp']
-      options[:nfs_version] = item['nfs_version'] unless item['nfs_version'].nil?
-    when 'rsync'
-      options[:rsync__args] = item['rsync__args'] unless item['rsync__args'].nil? or item['rsync__args'].empty?
-      options[:rsync__auto] = item['rsync__auto'] if !!item['rsync__auto'] == item['rsync__auto']
-      options[:rsync__chown] = item['rsync__chown'] if !!item['rsync__chown'] == item['rsync__chown']
-      options[:rsync__exclude] = item['rsync__exclude'] unless item['rsync__exclude'].nil? or item['rsync__exclude'].empty?
-    when 'smb'
-      options[:smb_host] = item['smb_host'] unless item['smb_host'].nil? or item['smb_host'].empty?
-      options[:smb_password] = item['smb_password'] unless item['smb_password'].nil? or item['smb_password'].empty?
-      options[:smb_username] = item['smb_username'] unless item['smb_password'].nil? or item['smb_password'].empty?
-    end
-
-    if item['supports'].nil? or item['supports'].include?(host_os_type)
-      config.vm.synced_folder item['host'], item['guest'], options
-    end
-  end
-
-  # plugins config
-  plugins_hash = data_hash['plugins']
-
-  plugins_hash.each do |plugin|
-    plugin_name = plugin['name']
-    if plugin['required'] == true
-      # thanks to http://matthewcooper.net/2015/01/15/automatically-installing-vagrant-plugin-dependencies/
-      exec "vagrant plugin install #{plugin_name} && vagrant #{ARGV.join(" ")}" unless Vagrant.has_plugin?(plugin_name) || ARGV[0] == 'plugin'
-
-      unless Vagrant.has_plugin?(plugin_name)
-        puts red("required: '$ vagrant plugin install #{plugin_name}'")
-        exit!
-      end
-    end
-
-    # this is current fixed config, not dynamic plugins config
-    # FIXME(hoatle): #186 should fix this
-    if Vagrant.has_plugin?(plugin_name) and plugin['enabled'] == true and plugin.key?('config_key')
-      config_key = plugin['config_key']
-      options = plugin['options']
-      if 'gatling' == config_key
-
-        unless options['latency'].nil?
-          config.gatling.latency = options['latency']
-        end
-
-        unless options['time_format'].nil? or options['time_format'].empty?
-          config.gatling.time_format = options['time_format']
-        end
-
-        unless options['rsync_on_startup'].nil?
-          config.gatling.rsync_on_startup = options['rsync_on_startup']
-        end
-
-      elsif 'hostmanager' == config_key
-        if Vagrant.has_plugin?('vagrant-hostsupdater')
-          puts red('recommended: $ vagrant plugin uninstall vagrant-hostsupdater')
-        end
-
-        unless options['enabled'].nil?
-          config.hostmanager.enabled = options['enabled']
-        end
-
-        unless options['manage_host'].nil?
-          config.hostmanager.manage_host = options['manage_host']
-        end
-
-        unless options['manage_guest'].nil?
-          config.hostmanager.manage_guest = options['manage_guest']
-        end
-
-        unless options['ignore_private_ip'].nil?
-          config.hostmanager.ignore_private_ip = options['ignore_private_ip']
-        end
-
-        unless options['include_offline'].nil?
-          config.hostmanager.include_offline = options['include_offline']
-        end
-
-        unless options['aliases'].nil?
-          config.hostmanager.aliases = options['aliases']
-        end
-
-        # workaround for :public_network
-        # maybe this will not work with :private_network
-        config.hostmanager.ip_resolver = proc do |vm, resolving_vm|
-          read_ip_address(vm)
-        end
-      end
-    end
-
-    # if plugin.key?('config_key')
-    #   config_key = plugin['config_key']
-    #   if Vagrant.has_plugin?(plugin_name) and !config_key.nil? and !config_key.empty?
-    #     puts red(config[config_key.to_sym])
-    #     # TODO(hoatle): remove config_key and required keys?
-    #     #config.instance_variable_set("@#{config_key}", plugin)
-    #     # new_config = Vagrant::Config::V2::Root.new({
-    #     #   config_key => plugin
-    #     # })
-    #     # config.merge(config, new_config)
-    #   end
-    # end
-  end
-
-  # ssh configuration
-  config.ssh.forward_agent = vm_hash['forward_agent']
-
-  # Provider-specific configuration so you can fine-tune various
-  # backing providers for Vagrant. These expose provider-specific options.
-  # Example for VirtualBox:
-  # View the documentation for the provider you're using for more
-  # information on available options.
-  config.vm.provider :virtualbox do |vb|
-
-    vb_hash = data_hash['vb']
-
-    # Don't boot with headless mode
-    if vb_hash['gui']  == true
-      vb.gui = true
-    end
-
-    # general settings for modifyvm: https://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvm
-    # TODO(hoatle): add support for key<1-N> type
-    # TODO(hoatle): add support for other settings
-
-    # FIXME(hoatle): there were 3 loops here, why?
-    # puts vb_hash
-
-    general_settings_keys = ['name', 'groups', 'description', 'ostype', 'memory', 'vram', 'acpi',
-      'ioapic', 'hardwareuuid', 'cpus', 'rtcuseutc', 'cpuhotplug', 'plugcpu', 'unplugcpu',
-      'cpuexecutioncap', 'pae', 'longmode', 'synthcpu', 'hpet', 'hwvirtex', 'triplefaultreset',
-      'nestedpaging', 'largepages', 'vtxvpid', 'vtxux', 'accelerate3d', 'bioslogofadein',
-      'bioslogodisplaytime', 'bioslogoimagepath', 'biosbootmenu', 'snapshotfolder', 'firmware',
-      'guestmemoryballoon', 'defaultfrontend'
-    ]
-
-    vb_hash.each do |key, val|
-      if general_settings_keys.include?(key) and !vb_hash[key].nil?
-        val = val.to_s.strip()
-        if !val.empty?
-          vb.customize ["modifyvm", :id, "--" + key, val]
-        end
-      end
-    end
-
-  end
-
-  # provisoners settings
-  provisioners = data_hash['provisioners']
-  chef_hash = data_hash['chef']
-
-  if !chef_hash.nil?
-    puts red("You're using deprecated setting for chef, will be removed by v0.5.0-b2, please update it now, see more: https://github.com/teracyhq/dev/issues/166")
-
-    # chef_hash should override the default provisioner chef_solo
-    provisioners.each do |provisioner|
-      if provisioner['type'] == 'chef_solo'
-        chef_hash = overrides(provisioner, chef_hash)
-      end
-    end
-
-    if chef_hash['enabled'].nil? or chef_hash['enabled'] == true
-      config.vm.provision "chef_solo" do |chef|
-        chef.log_level = chef_hash['log_level']
-        chef.cookbooks_path = chef_hash['cookbooks_path']
-        chef.data_bags_path = chef_hash['data_bags_path']
-        chef.environments_path = chef_hash['environments_path']
-        chef.environment = chef_hash['environment']
-        chef.nodes_path = chef_hash['nodes_path']
-        chef.recipe_url = chef_hash['recipe_url']
-        chef.roles_path = chef_hash['roles_path']
-        chef.synced_folder_type = chef_hash['synced_folder_type']
-
-        unless chef_hash['roles'].nil?
-          chef_hash['roles'].each do |role|
-            chef.add_role role
-          end
-        end
-
-        unless chef_hash['recipes'].nil?
-          chef_hash['recipes'].each do |recipe|
-            chef.add_recipe recipe
-          end
-        end
-
-        chef.json = chef_hash['json']
-      end
-      # empty provisioners to work as backward compatible
-      provisioners = []
-    end
-  end
-
-  # fix hosts file on the guest machine
-  # see: https://github.com/devopsgroup-io/vagrant-hostmanager/issues/203
-  fix_hosts_command = "sed -i \"s/\\(127.0.0.1\\)\\(.*\\)#{config.vm.hostname}\\(.*\\)/\\1\\3/\" /etc/hosts"
-
-  provisioners.unshift({
-    "type" => "shell",
-    "name" => "fix-hosts",
-    "inline" => fix_hosts_command
-  })
-
-  # save the MAC address if the file /vagrant/.vagrant/.public_mac_address exists
-  provisioners << {
-    "type" => "shell",
-    "name" => "save_mac_address",
-    "path" => "provisioners/shells/save_mac_address.sh",
-    "run" => "always"
-  }
-
-  # append ip shell as the last item to always display the ip address
-  provisioners << {
-    "type" => "shell",
-    "name" => "ip",
-    "path" => "provisioners/shells/ip.sh",
-    "run" => "always"
-  }
-
-  provisioners.each do |provisioner|
-    type = provisioner['type']
-    run = 'once'
-    preserve_order = false
-    if !provisioner['run'].nil?
-      run = provisioner['run'] # one of: once, always, or never
-    end
-    if provisioner['preserve_order'] == true
-      preserve_order = true
-    end
-
-    if provisioner['name'].nil?
-      config.vm.provision "#{type}", run: run, preserve_order: preserve_order do |provision|
-        provision_settings(type, provision, provisioner)
-      end
-    else
-      config.vm.provision provisioner['name'], type: type, run: run, preserve_order: preserve_order do |provision|
-        provision_settings(type, provision, provisioner)
-      end
-    end
-  end
-end
+# pre-load-ext list here
 
+Vagrant.configure("2") do |config|
+  settings["nodes"].each do |node_config|
+    $logger.debug("node_config: #{node_config}")
+    config.vm.define node_config["name"] do |node|
 
-begin
-  extension_list.each do |path|
-    if File.file?(path)
-      load path
     end
   end
-rescue Exception => msg
-  puts red(msg)
+  # post-load-ext list here
 end
diff --git a/config_default.yaml b/config_default.yaml
new file mode 100644
index 00000000..ce8450ab
--- /dev/null
+++ b/config_default.yaml
@@ -0,0 +1,96 @@
+# vars must be defined to be used
+# format:
+# key: ${ENV_VAR}
+# key: ${ENV_VAR-:default}
+# and "#{key}" can be used for settings values if available
+variables:
+  node_name_prefix: ${NODE_NAME_PREFIX:-node}
+  node_hostname_prefix: ${NODE_HOSTNAME_PREFIX:-teracy-dev}
+  some_value: ${MY_VAR:-value}-affix
+
+
+# vagrant related settings
+vagrant:
+  require_version: ">= 2.1.0"
+  plugins:
+    - _id: "0"
+      name: vagrant-gatling-rsync
+      required: true
+      enabled: true
+      config_key: gatling
+      options:
+        latency: 0.5
+        time_format: "%H:%M:%S"
+        rsync_on_startup: true
+    - _id: "1"
+      name: vagrant-rsync-back
+      required: true
+      enabled: true
+    - _id: "2"
+      name: vagrant-hostmanager
+      required: true
+      enabled: true
+      config_key: hostmanger
+      options:
+        manage_host: true
+        manage_guest: true
+  # usually defined from workspace/dev-setup/
+  preload_extension_paths:
+  postload_extension_paths:
+  config_paths:
+
+
+# teracy-dev related settings
+teracy-dev:
+  require_version: ">= 0.6.0-a1-SNAPSHOT"
+
+
+# default settings for all nodes
+default:
+  vm:
+    box: bento/ubuntu-16.04
+    box_version:
+    box_url:
+  providers:
+    - _id: "0"
+      enabled: true
+      name: virtualbox
+      require_version: ">=5.2.14"
+      gui: false
+      memory: 1024
+      description: "teracy-dev #{Time.now.getutc.to_i}"
+  provisioners:
+    - _id: "0"
+      enabled: false
+      type: chef_solo
+      verion: "13.1.31"
+      log_level: info # one of debug, info, warn, error, fatal. Default: info
+      cookbooks_path:
+        - vendor-cookbooks
+        - main-cookbooks
+      roles_path: roles
+      nodes_path: nodes
+      data_bags_path: data_bags
+      run_list:
+        - vim
+        - teracy-dev
+      json:
+        docker:
+          enabled: false
+          version: 1.8.0
+    - _id: "1"
+      enabled: false
+      type: ansible_local
+      # etc
+
+
+# specific nodes, each node will override the default
+nodes:
+  - name: "#{node_name_prefix}-1"
+    is_primary: true
+    vm:
+      hostname: "#{NODE_HOSTNAME_PREFIX}-1.local"
+  - name: "#{node_name_prefix}-2"
+    vm:
+      hostname: "#{NODE_HOSTNAME_PREFIX}-2.local"
+
diff --git a/lib/utility.rb b/lib/utility.rb
index 844037df..47c7b0f8 100644
--- a/lib/utility.rb
+++ b/lib/utility.rb
@@ -1,3 +1,5 @@
+require 'logger'
+
 # Utility functions
 def overrides(obj1, obj2)
   obj2.each do |key, value|
@@ -154,3 +156,41 @@ def read_ip_address(machine)
   # the second inet is more accurate
   result.chomp.split("\n").last
 end
+
+
+
+# $ LOG_LEVEL=debug vagrant status
+def get_logger()
+  logger = Logger.new(STDOUT)
+
+  log_level = ENV['LOG_LEVEL'] ||= "info"
+
+  case log_level
+    when "unknown"
+      logger.level = Logger::UNKNOWN
+    when "fatal"
+      logger.level = Logger::FATAL
+    when "error"
+      logger.level = Logger::ERROR
+    when "warn"
+      logger.level = Logger::WARN
+    when "info"
+      logger.level = Logger::INFO
+    when "debug"
+      logger.level = Logger::DEBUG
+  end
+
+  logger.formatter = proc do |severity, datetime, progname, msg|
+    msg = "[teracy-dev][#{severity}]: #{msg}\n"
+    case severity
+    when "UNKNOWN", "FATAL", "ERROR"
+      msg = red(msg)
+    when "WARN"
+      msg = yellow(msg)
+    end
+    puts msg
+  end
+
+  return logger
+end
+
diff --git a/vagrant_config.json b/vagrant_config.json
deleted file mode 100644
index 67ed220e..00000000
--- a/vagrant_config.json
+++ /dev/null
@@ -1,89 +0,0 @@
-{
-  "vm": {
-    "hostname": "teracy-dev.local",
-    "box": "bento/ubuntu-16.04",
-    "box_version": "",
-    "networks": [{ // see: http://docs.vagrantup.com/v2/networking/index.html
-      "_id": "0",
-      "mode": "public_network", // one of "forwarded_port", "private_network" or "public_network"
-      //by default, 192.168.99.100 is used for Boot2Docker
-      // for convention, use 192.168.99.101 for teracy-dev, 192.168.99.102 for teracy-staging, etc.
-      //"ip": "" // for private_network, public_network mode
-      //"type":"dhcp", // for private_network mode; if ip and type are both defined, ip takes precedence
-      //"auto_config":true, // for private_network mode + ip
-      "bridge": [
-        // see: https://github.com/teracyhq/dev/issues/262
-        // "eth0", //wired LAN, the first priority
-        // "en0: Wi-Fi (AirPort)", // macOS 10.12
-        // "en1: Wi-Fi (AirPort)", // macOS 10.11
-        // "wlan0" // linux
-      ], // for public_network mode
-      "auto_bridge_default_network": true,
-      "reuse_mac_address": true
-    }],
-    "synced_folders":[{ //see: http://docs.vagrantup.com/v2/synced-folders/index.html
-      "_id": "0",
-      "type": "virtual_box",
-      "host": ".",
-      "guest": "/vagrant"
-    }, {
-      "_id": "1",
-      "type": "rsync",
-      "host": "./workspace",
-      "guest": "/home/vagrant/workspace",
-      "rsync__exclude": [".git", ".idea", ".#*"]
-    }]
-    // Other configs
-    // "boot_timeout": 300,
-    // "box_check_update": true,
-    // "box_download_checksum": "",
-    // "box_download_checksum_type": "", // "md5", "sha1", "sha256"
-    // "box_download_client_cert": "",
-    // "box_download_ca_cert": "",
-    // "box_download_ca_path": "",
-    // "box_download_insecure": true, // true, false
-    // "communicator": "ssh", // ssh, winrm
-    // "graceful_halt_timeout": 60,
-    // "guest": "linux", // linux
-    // "hostname": "",
-    // "post_up_message": "",
-    // "usable_port_range": "2200..2250" // 2200..2250
-  },
-  "vb": { //virtualbox settings from https://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvm
-    //"gui":true,
-    //"name":"teracy-dev",
-    "memory": 1024,
-    //"cpus":1,
-    "description": "teracy-dev #{Time.now.getutc.to_i}"
-  },
-  "plugins": [{
-    "_id": "0",
-    "name": "vagrant-gatling-rsync",
-    "config_key": "gatling",
-    "required": true,
-    "enabled": true,
-    "options": {
-      // auto rsync watch when up/ reload done
-      // should try to reduce rsync latency to 0.5s instead of 1s #173
-      "latency": 0.5, //0.5s
-      "time_format": "%H:%M:%S",
-      "rsync_on_startup": true
-    }
-  }, {
-    "_id": "1",
-    "name": "vagrant-rsync-back",
-    "required": true,
-    "enabled": true
-  }, {
-    "_id" : "2",
-    "name" : "vagrant-hostmanager",
-    "config_key" : "hostmanager",
-    "required" : true,
-    "enabled" : true,
-    "options" : {
-      "enabled" : true,
-      "manage_host" : true,
-      "manage_guest" : true
-    }
-  }]
-}