Merge pull request #5086 from MaxKam/checkCPUCount

Minimum CPUs check

cmd/minikube/cmd/start.go

@@ -39,6 +39,7 @@ import (
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
+	"github.com/shirou/gopsutil/cpu"
 	gopshost "github.com/shirou/gopsutil/host"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -582,6 +583,22 @@ func validateConfig() {
 			out.V{"memory": memorySizeMB, "default_memorysize": pkgutil.CalculateSizeInMB(constants.DefaultMemorySize)})
 	}
 
+	var cpuCount int
+	if viper.GetString(vmDriver) == constants.DriverNone {
+		// Uses the gopsutil cpu package to count the number of physical cpu cores
+		ci, err := cpu.Counts(false)
+		if err != nil {
+			glog.Warningf("Unable to get CPU info: %v", err)
+		} else {
+			cpuCount = ci
+		}
+	} else {
+		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 !cfg.ContainsParam(kubeadm.KubeadmExtraArgsWhitelist[kubeadm.KubeadmCmdParam], param) &&

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