server list looks like something

web/db/migrate/20160220091225_create_operating_systems.rb

@@ -0,0 +1,8 @@
+class CreateOperatingSystems < ActiveRecord::Migration
+  def change
+    create_table :operating_systems do |t|
+      t.string :name, null: false
+      t.timestamps null: false
+    end
+  end
+end