kubeadm: update constants for 1.18

- Include 1.19 as a supported etcd mapping.
- Update minimum and current versions.

Author: neolit123

cmd/kubeadm/app/constants/constants.go

@@ -411,13 +411,13 @@ var (
 	ControlPlaneComponents = []string{KubeAPIServer, KubeControllerManager, KubeScheduler}
 
 	// MinimumControlPlaneVersion specifies the minimum control plane version kubeadm can deploy
-	MinimumControlPlaneVersion = version.MustParseSemantic("v1.16.0")
+	MinimumControlPlaneVersion = version.MustParseSemantic("v1.17.0")
 
 	// MinimumKubeletVersion specifies the minimum version of kubelet which kubeadm supports
-	MinimumKubeletVersion = version.MustParseSemantic("v1.16.0")
+	MinimumKubeletVersion = version.MustParseSemantic("v1.17.0")
 
 	// CurrentKubernetesVersion specifies current Kubernetes version supported by kubeadm
-	CurrentKubernetesVersion = version.MustParseSemantic("v1.17.0")
+	CurrentKubernetesVersion = version.MustParseSemantic("v1.18.0")
 
 	// SupportedEtcdVersion lists officially supported etcd versions with corresponding Kubernetes releases
 	SupportedEtcdVersion = map[uint8]string{
@@ -427,6 +427,7 @@ var (
 		16: "3.3.17-0",
 		17: "3.4.3-0",
 		18: "3.4.3-0",
+		19: "3.4.3-0",
 	}
 
 	// KubeadmCertsClusterRoleName sets the name for the ClusterRole that allows