diff --git a/manifests/master.pp b/manifests/master.pp
index bf8f4e2..763cbba 100644
--- a/manifests/master.pp
+++ b/manifests/master.pp
@@ -16,8 +16,6 @@
   $manage_package = true,
   $ensure         = 'present',
 ) {
-  validate_legacy('NotUndef[String]', 'validate_re', $ensure, ['.'])
-
   include ::kubernetes::client
 
   if $manage_package {
diff --git a/manifests/node/kubelet.pp b/manifests/node/kubelet.pp
index b2200a3..45e206c 100644
--- a/manifests/node/kubelet.pp
+++ b/manifests/node/kubelet.pp
@@ -61,7 +61,7 @@
 # [*cloud_provider*]
 #   The provider for cloud services. By default, kubelet will attempt to auto-detect the cloud provider.
 #   Specify empty string for running with no cloud provider. [default=auto-detect]
-#   Default undef. (default "auto-detect")
+#   Default undef.
 #
 # [*cluster_dns*]
 #   IP address for a cluster DNS server.  This value is used for containers' DNS server in case of Pods with "dnsPolicy=ClusterFirst"
@@ -556,6 +556,18 @@
 ) inherits kubernetes::node::params {
   validate_re($ensure, '^(running|stopped)$')
   validate_bool($enable)
+  if $allow_privileged { validate_bool($allow_privileged) }
+  if $containerized { validate_bool($containerized) }
+  if $cpu_cfs_quota { validate_bool($cpu_cfs_quota) }
+  if $enable_controller_attach_detach { validate_bool($enable_controller_attach_detach) }
+  if $enable_custom_metrics { validate_bool($enable_custom_metrics) }
+  if $enable_debugging_handlers { validate_bool($enable_debugging_handlers) }
+  if $enable_server { validate_bool($enable_server) }
+  if $register_node { validate_bool($register_node) }
+  if $register_schedulable { validate_bool($register_schedulable) }
+  if $require_kubeconfig { validate_bool($require_kubeconfig) }
+  if $runonce { validate_bool($runonce) }
+  if $serialize_image_pulls { validate_bool($serialize_image_pulls) }
 
   include ::kubernetes::node
 
diff --git a/metadata.json b/metadata.json
index b73fe1c..0f6c916 100644
--- a/metadata.json
+++ b/metadata.json
@@ -1,6 +1,6 @@
 {
 	"name": "cristifalcas-kubernetes",
-	"version": "3.4.2",
+	"version": "3.5.0",
 	"author": "Cristian Falcas",
 	"license": "Apache-2.0",
 	"summary": "Configuring and installing kubernetes",
diff --git a/templates/etc/kubernetes/kubelet.erb b/templates/etc/kubernetes/kubelet.erb
index dc2e06b..154ce3c 100644
--- a/templates/etc/kubernetes/kubelet.erb
+++ b/templates/etc/kubernetes/kubelet.erb
@@ -15,7 +15,9 @@ KUBELET_API_SERVER="--api-servers=<%= Array(scope['kubernetes::node::kubelet::ap
 
 # Add your own!
 KUBELET_ARGS="<% -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::allow_privileged')) -%>
  --allow-privileged=<%= scope['kubernetes::node::kubelet::allow_privileged'] -%>
+<% end -%>
 <% if @cadvisor_port -%>
  --cadvisor-port=<%= scope['kubernetes::node::kubelet::cadvisor_port'] -%>
 <% end -%>
@@ -52,10 +54,10 @@ KUBELET_ARGS="<% -%>
 <% if @container_runtime_endpoint -%>
  --container-runtime-endpoint=<%= scope['kubernetes::node::kubelet::container_runtime_endpoint'] -%>
 <% end -%>
-<% if @containerized -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::containerized')) -%>
  --containerized=<%= scope['kubernetes::node::kubelet::containerized'] -%>
 <% end -%>
-<% if @cpu_cfs_quota -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::cpu_cfs_quota')) -%>
  --cpu-cfs-quota=<%= scope['kubernetes::node::kubelet::cpu_cfs_quota'] -%>
 <% end -%>
 <% if @docker_endpoint -%>
@@ -64,16 +66,16 @@ KUBELET_ARGS="<% -%>
 <% if @docker_exec_handler -%>
  --docker-exec-handler=<%= scope['kubernetes::node::kubelet::docker_exec_handler'] -%>
 <% end -%>
-<% if @enable_controller_attach_detach -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::enable_controller_attach_detach')) -%>
  --enable-controller-attach-detach=<%= scope['kubernetes::node::kubelet::enable_controller_attach_detach'] -%>
 <% end -%>
-<% if @enable_custom_metrics -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::enable_custom_metrics')) -%>
  --enable-custom-metrics=<%= scope['kubernetes::node::kubelet::enable_custom_metrics'] -%>
 <% end -%>
-<% if @enable_debugging_handlers -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::enable_debugging_handlers')) -%>
  --enable-debugging-handlers=<%= scope['kubernetes::node::kubelet::enable_debugging_handlers'] -%>
 <% end -%>
-<% if @enable_server -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::enable_server')) -%>
  --enable-server=<%= scope['kubernetes::node::kubelet::enable_server'] -%>
 <% end -%>
 <% if @event_burst -%>
@@ -213,10 +215,10 @@ KUBELET_ARGS="<% -%>
 <% if @reconcile_cidr -%>
  --reconcile-cidr=<%= scope['kubernetes::node::kubelet::reconcile_cidr'] -%>
 <% end -%>
-<% if @register_node -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::register_node')) -%>
  --register-node=<%= scope['kubernetes::node::kubelet::register_node'] -%>
 <% end -%>
-<% if @register_schedulable -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::register_schedulable')) -%>
  --register-schedulable=<%= scope['kubernetes::node::kubelet::register_schedulable'] -%>
 <% end -%>
 <% if @registry_burst -%>
@@ -225,7 +227,7 @@ KUBELET_ARGS="<% -%>
 <% if @registry_qps -%>
  --registry-qps=<%= scope['kubernetes::node::kubelet::registry_qps'] -%>
 <% end -%>
-<% if @require_kubeconfig -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::require_kubeconfig')) -%>
  --require-kubeconfig=<%= scope['kubernetes::node::kubelet::require_kubeconfig'] -%>
 <% end -%>
 <% if @resolv_conf -%>
@@ -240,7 +242,7 @@ KUBELET_ARGS="<% -%>
 <% if @root_dir -%>
  --root-dir=<%= scope['kubernetes::node::kubelet::root_dir'] -%>
 <% end -%>
-<% if @runonce -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::runonce')) -%>
  --runonce=<%= scope['kubernetes::node::kubelet::runonce'] -%>
 <% end -%>
 <% if @runtime_cgroups -%>
@@ -249,7 +251,9 @@ KUBELET_ARGS="<% -%>
 <% if @runtime_request_timeout -%>
  --runtime-request-timeout=<%= scope['kubernetes::node::kubelet::runtime_request_timeout'] -%>
 <% end -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('kubernetes::node::kubelet::serialize_image_pulls')) -%>
  --serialize-image-pulls=<%= scope['kubernetes::node::kubelet::serialize_image_pulls'] -%>
+<% end -%>
 <% if @streaming_connection_idle_timeout -%>
  --streaming-connection-idle-timeout=<%= scope['kubernetes::node::kubelet::streaming_connection_idle_timeout'] -%>
 <% end -%>