diff --git a/vagrant/cluster/Vagrantfile b/vagrant/cluster/Vagrantfile
index b2fd38eac413a2c426eebf7d4bf20e55ac0c6de1..32160eb97cae442e736256829a3463158e2db68f 100644
--- a/vagrant/cluster/Vagrantfile
+++ b/vagrant/cluster/Vagrantfile
@@ -1,4 +1,6 @@
-
+### Configuration parameters ###
+NUMBER_OF_DATANODE = 2
+### end of Configuration parameters ###
 
 Vagrant.configure("2") do |config|
 	config.vm.define "namenode" do |namenode|
@@ -17,7 +19,7 @@ Vagrant.configure("2") do |config|
 	end
 
 	# Number of datanode
-	N = 2
+	N = NUMBER_OF_DATANODE
 	(1..2).each do |machine_id|
 		config.vm.define "datanode#{machine_id}" do |machine|
 			machine.vm.box = "generic/debian10"