Update

app/controllers/node_controller.rb

@@ -0,0 +1,15 @@
+class NodeController < ApplicationController
+  def index
+    @hosts = Array.new
+
+    if get_hosts.blank?
+      flash[:danger] = "Check Server"
+    else
+      @hosts = get_hosts
+    end
+  end
+
+  def get_hosts
+    return ['2', 'aaa', 'bbb', 'ccc']
+  end
+end