Added check to exit app and show error message if number of cpus

is less than the minimum required.

Author: MaxKam

Diff for: cmd/minikube/cmd/start.go

@@ -536,6 +536,11 @@ func validateConfig() {
 			out.V{"memory": memorySizeMB, "default_memorysize": pkgutil.CalculateSizeInMB(constants.DefaultMemorySize)})
 	}
 
+	cpuCount = viper.GetInt(cpus)
+	if cpuCount < constants.MinimumCPUS {
+		exit.UsageT("Requested cpu count {{.requested_cpus}} is less than the minimum allowed of {{.minimum_cpus}}", out.V{"requested_cpus": cpuCount, "minimum_cpus": constants.MinimumCPUS})
+	}
+
 	// check that kubeadm extra args contain only whitelisted parameters
 	for param := range extraOptions.AsMap().Get(kubeadm.Kubeadm) {
 		if !pkgutil.ContainsString(kubeadm.KubeadmExtraArgsWhitelist[kubeadm.KubeadmCmdParam], param) &&

Diff for: pkg/minikube/constants/constants.go

@@ -141,6 +141,8 @@ const (
 	MinimumMemorySize = "1024mb"
 	// DefaultCPUS is the default number of cpus of a host
 	DefaultCPUS = 2
+	// MinimumCPUS is the minimum number of cpus of a host
+	MinimumCPUS = 2
 	// DefaultDiskSize is the default disk image size, in megabytes
 	DefaultDiskSize = "20000mb"
 	// MinimumDiskSize is the minimum disk image size, in megabytes