Ensure ControllerManagerExtraArgs take precedence over generated args

cmd/kubeadm/app/apis/kubeadm/types.go

@@ -157,10 +157,6 @@ type Networking struct {
 	PodSubnet string
 	// DNSDomain is the dns domain used by k8s services. Defaults to "cluster.local".
 	DNSDomain string
-	// NodeCIDRMaskSize is the size of the Pod subnet allocated to each node. Only
-	// applies when PodSubnet is also specified. Defaults to "24" for IPv4 or a
-	// calculated subset of an IPv6 PodSubnet.
-	NodeCIDRMaskSize string
 }
 
 // Etcd contains elements describing Etcd configuration.

cmd/kubeadm/app/phases/controlplane/manifests.go

@@ -321,28 +321,27 @@ func getControllerManagerCommand(cfg *kubeadmapi.MasterConfiguration, k8sVersion
 		defaultArguments["cluster-signing-cert-file"] = ""
 	}
 
-	command := []string{"kube-controller-manager"}
-	command = append(command, kubeadmutil.BuildArgumentListFromMap(defaultArguments, cfg.ControllerManagerExtraArgs)...)
-
 	if cfg.CloudProvider != "" {
-		command = append(command, "--cloud-provider="+cfg.CloudProvider)
+		defaultArguments["cloud-provider"] = cfg.CloudProvider
 
 		// Only append the --cloud-config option if there's a such file
 		if _, err := os.Stat(DefaultCloudConfigPath); err == nil {
-			command = append(command, "--cloud-config="+DefaultCloudConfigPath)
+			defaultArguments["cloud-config"] = DefaultCloudConfigPath
 		}
 	}
 
 	// Let the controller-manager allocate Node CIDRs for the Pod network.
 	// Each node will get a subspace of the address CIDR provided with --pod-network-cidr.
 	if cfg.Networking.PodSubnet != "" {
-		maskSize := cfg.Networking.NodeCIDRMaskSize
-		if maskSize == "" {
-			maskSize = calcNodeCidrSize(cfg.Networking.PodSubnet)
-		}
-		command = append(command, "--allocate-node-cidrs=true", "--cluster-cidr="+cfg.Networking.PodSubnet,
-			"--node-cidr-mask-size="+maskSize)
+		maskSize := calcNodeCidrSize(cfg.Networking.PodSubnet)
+		defaultArguments["allocate-node-cidrs"] = "true"
+		defaultArguments["cluster-cidr"] = cfg.Networking.PodSubnet
+		defaultArguments["node-cidr-mask-size"] = maskSize
 	}
+
+	command := []string{"kube-controller-manager"}
+	command = append(command, kubeadmutil.BuildArgumentListFromMap(defaultArguments, cfg.ControllerManagerExtraArgs)...)
+
 	return command
 }
 

cmd/kubeadm/app/phases/controlplane/manifests_test.go

@@ -776,9 +776,10 @@ func TestGetControllerManagerCommand(t *testing.T) {
 		},
 		{
 			cfg: &kubeadmapi.MasterConfiguration{
-				Networking:        kubeadmapi.Networking{PodSubnet: "10.0.1.15/16", NodeCIDRMaskSize: "20"},
-				CertificatesDir:   testCertsDir,
-				KubernetesVersion: "v1.7.0",
+				Networking:                 kubeadmapi.Networking{PodSubnet: "10.0.1.15/16"},
+				ControllerManagerExtraArgs: map[string]string{"node-cidr-mask-size": "20"},
+				CertificatesDir:            testCertsDir,
+				KubernetesVersion:          "v1.7.0",
 			},
 			expected: []string{
 				"kube-controller-manager",