diff --git a/.gitignore b/.gitignore
index f750c3d..d87ff2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ bin
 *.test
 
 # Output of the go coverage tool, specifically when used with LiteIDE
+out/
 *.out
 
 # Kubernetes Generated files - skip generated files, except for vendored files
diff --git a/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigs.yaml b/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigs.yaml
index 4c2056f..36888d0 100644
--- a/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigs.yaml
+++ b/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigs.yaml
@@ -298,9 +298,7 @@ spec:
                         Defaults to "10.96.0.0/12".
                       type: string
                   required:
-                  - dnsDomain
                   - podSubnet
-                  - serviceSubnet
                   type: object
                 scheduler:
                   description: Scheduler contains extra settings for the scheduler
diff --git a/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigtemplates.yaml b/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigtemplates.yaml
index 2269dfe..0cb2344 100644
--- a/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigtemplates.yaml
+++ b/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigtemplates.yaml
@@ -317,9 +317,7 @@ spec:
                                 services. Defaults to "10.96.0.0/12".
                               type: string
                           required:
-                          - dnsDomain
                           - podSubnet
-                          - serviceSubnet
                           type: object
                         scheduler:
                           description: Scheduler contains extra settings for the scheduler
diff --git a/kubeadm/v1beta1/types.go b/kubeadm/v1beta1/types.go
index 1b07ce3..4a9249f 100644
--- a/kubeadm/v1beta1/types.go
+++ b/kubeadm/v1beta1/types.go
@@ -227,11 +227,13 @@ type NodeRegistrationOptions struct {
 // Networking contains elements describing cluster's networking configuration
 type Networking struct {
 	// ServiceSubnet is the subnet used by k8s services. Defaults to "10.96.0.0/12".
-	ServiceSubnet string `json:"serviceSubnet"`
+	// +optional
+	ServiceSubnet string `json:"serviceSubnet,omitempty"`
 	// PodSubnet is the subnet used by pods.
 	PodSubnet string `json:"podSubnet"`
 	// DNSDomain is the dns domain used by k8s services. Defaults to "cluster.local".
-	DNSDomain string `json:"dnsDomain"`
+	// +optional
+	DNSDomain string `json:"dnsDomain,omitempty"`
 }
 
 // BootstrapToken describes one bootstrap token, stored as a Secret in the cluster