bring back check for dry run

cmd/minikube/cmd/start.go

@@ -950,6 +950,11 @@ func validateFlags(cmd *cobra.Command, drvName string) {
 		if !driver.HasResourceLimits(drvName) {
 			out.WarningT("The '{{.name}}' driver does not respect the --memory flag", out.V{"name": drvName})
 		}
+		req, err := util.CalculateSizeInMB(viper.GetString(memory))
+		if err != nil {
+			exit.WithCodeT(exit.Config, "Unable to parse memory '{{.memory}}': {{.error}}", out.V{"memory": viper.GetString(memory), "error": err})
+		}
+		validateMemorySize(req, drvName)
 	}
 
 	if cmd.Flags().Changed(containerRuntime) {

cmd/minikube/cmd/start_flags.go

@@ -236,12 +236,12 @@ func generateClusterConfig(cmd *cobra.Command, existing *config.ClusterConfig, k
 				exit.UsageT("{{.driver_name}} has only {{.container_limit}}MB memory but you specified {{.specified_memory}}MB", out.V{"container_limit": containerLimit, "specified_memory": mem, "driver_name": driver.FullName(drvName)})
 			}
 
+			validateMemorySize(mem, drvName)
+
 		} else {
 			glog.Infof("Using suggested %dMB memory alloc based on sys=%dMB, container=%dMB", mem, sysLimit, containerLimit)
 		}
 
-		validateMemorySize(mem, drvName)
-
 		diskSize, err := pkgutil.CalculateSizeInMB(viper.GetString(humanReadableDiskSize))
 		if err != nil {
 			exit.WithCodeT(exit.Config, "Generate unable to parse disk size '{{.diskSize}}': {{.error}}", out.V{"diskSize": viper.GetString(humanReadableDiskSize), "error": err})