Allow passing in extra args to etcd via command line

pkg/minikube/bootstrapper/bsutil/extraconfig.go

@@ -49,6 +49,7 @@ var componentToKubeadmConfigKey = map[string]string{
 	Apiserver:         "apiServer",
 	ControllerManager: "controllerManager",
 	Scheduler:         "scheduler",
+	Etcd:              "etcd",
 	Kubeadm:           "kubeadm",
 	// The KubeProxy is handled in different config block
 	Kubeproxy: "",
@@ -183,20 +184,21 @@ func optionPairsForComponent(component string, version semver.Version, cp config
 // kubeadm extra args should not be included in the kubeadm config in the extra args section (instead, they must
 // be inserted explicitly in the appropriate places or supplied from the command line); here we remove all of the
 // kubeadm extra args from the slice
+// etcd must also not be included in that section, as those extra args exist in the `etcd` section
 // createExtraComponentConfig generates a map of component to extra args for all of the components except kubeadm
 func createExtraComponentConfig(extraOptions config.ExtraOptionSlice, version semver.Version, componentFeatureArgs string, cp config.Node) ([]componentOptions, error) {
 	extraArgsSlice, err := newComponentOptions(extraOptions, version, componentFeatureArgs, cp)
 	if err != nil {
 		return nil, err
 	}
-
-	for i, extraArgs := range extraArgsSlice {
-		if extraArgs.Component == Kubeadm {
-			extraArgsSlice = append(extraArgsSlice[:i], extraArgsSlice[i+1:]...)
-			break
+	validComponents := []componentOptions{}
+	for _, extraArgs := range extraArgsSlice {
+		if extraArgs.Component == Kubeadm || extraArgs.Component == Etcd {
+			continue
 		}
+		validComponents = append(validComponents, extraArgs)
 	}
-	return extraArgsSlice, nil
+	return validComponents, nil
 }
 
 // createKubeProxyOptions generates a map of extra config for kube-proxy

pkg/minikube/bootstrapper/bsutil/ktmpl/v1beta2.go

@@ -63,6 +63,12 @@ dns:
 etcd:
   local:
     dataDir: {{.EtcdDataDir}}
+{{- if .EtcdExtraArgs}}
+    extraArgs:
+{{- range $i, $val := printMapInOrder .EtcdExtraArgs ": " }}
+      {{$val}}
+{{- end}}
+{{- end}}
 controllerManager:
   extraArgs:
     "leader-elect": "false"

pkg/minikube/bootstrapper/bsutil/kubeadm.go

@@ -73,6 +73,7 @@ func GenerateKubeadmYAML(cc config.ClusterConfig, n config.Node, r cruntime.Mana
 		APIServerPort       int
 		KubernetesVersion   string
 		EtcdDataDir         string
+		EtcdExtraArgs       map[string]string
 		ClusterName         string
 		NodeName            string
 		DNSDomain           string
@@ -92,6 +93,7 @@ func GenerateKubeadmYAML(cc config.ClusterConfig, n config.Node, r cruntime.Mana
 		APIServerPort:     nodePort,
 		KubernetesVersion: k8s.KubernetesVersion,
 		EtcdDataDir:       EtcdDataDir(),
+		EtcdExtraArgs:     etcdExtraArgs(k8s.ExtraOptions),
 		ClusterName:       cc.Name,
 		//kubeadm uses NodeName as the --hostname-override parameter, so this needs to be the name of the machine
 		NodeName:            KubeNodeName(cc, n),
@@ -138,6 +140,7 @@ const (
 	Scheduler         = "scheduler"
 	ControllerManager = "controller-manager"
 	Kubeproxy         = "kube-proxy"
+	Etcd              = "etcd"
 )
 
 // InvokeKubeadm returns the invocation command for Kubeadm
@@ -149,3 +152,14 @@ func InvokeKubeadm(version string) string {
 func EtcdDataDir() string {
 	return path.Join(vmpath.GuestPersistentDir, "etcd")
 }
+
+func etcdExtraArgs(extraOpts config.ExtraOptionSlice) map[string]string {
+	args := map[string]string{}
+	for _, eo := range extraOpts {
+		if eo.Component != Etcd {
+			continue
+		}
+		args[eo.Key] = eo.Value
+	}
+	return args
+}

pkg/minikube/bootstrapper/bsutil/kubeadm_test.go

@@ -22,6 +22,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/google/go-cmp/cmp"
 	"github.com/pmezard/go-difflib/difflib"
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/constants"
@@ -240,9 +241,24 @@ func TestGenerateKubeadmYAML(t *testing.T) {
 					t.Fatalf("diff error: %v", err)
 				}
 				if diff != "" {
-					t.Errorf("unexpected diff:\n%s\n===== [RAW OUTPUT] =====\n%s", diff, got)
+					t.Errorf("unexpected diff:\n%s\n", diff)
 				}
 			})
 		}
 	}
 }
+
+func TestEtcdExtraArgs(t *testing.T) {
+	expected := map[string]string{
+		"key": "value",
+	}
+	extraOpts := append(getExtraOpts(), config.ExtraOption{
+		Component: Etcd,
+		Key:       "key",
+		Value:     "value",
+	})
+	actual := etcdExtraArgs(extraOpts)
+	if diff := cmp.Diff(expected, actual); diff != "" {
+		t.Errorf("machines mismatch (-want +got):\n%s", diff)
+	}
+}