Use tmpfs for etcd in e2e test clusters

e2e/cluster/cluster_e2e_test.go

@@ -41,6 +41,30 @@ func Test_DefaultConfig(t *testing.T) {
 	cluster.Delete()
 }
 
+func Test_UseEtcdRamDisk(t *testing.T) {
+	// create cluster with default configuration
+	config, err := cluster.NewConfig(
+		"e2e-etcdramdisk-cluster",
+		cluster.Options{
+			Wait:           time.Second * 60,
+			UseEtcdRAMDisk: true,
+		},
+	)
+	if err != nil {
+		t.Errorf("failed creating cluster configuration: %v", err)
+		return
+	}
+
+	cluster, err := config.Create()
+	if err != nil {
+		t.Errorf("failed to create cluster: %v", err)
+		return
+	}
+
+	// delete cluster
+	cluster.Delete()
+}
+
 func getKubernetesClient(kubeconfig string) (kubernetes.Interface, error) {
 	config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
 	if err != nil {
@@ -126,7 +150,6 @@ func Test_PreloadImages(t *testing.T) {
 	}
 }
 
-
 func Test_KubernetesVersion(t *testing.T) {
 	// create cluster with default configuration
 	config, err := cluster.NewConfig(

pkg/testutils/cluster/cluster.go

@@ -31,6 +31,14 @@ apiVersion: kind.x-k8s.io/v1alpha4
 nodes:
 - role: control-plane`
 
+const etcdPatch = `
+kubeadmConfigPatches:
+- |
+  kind: ClusterConfiguration
+  etcd:
+    local:
+      dataDir: /tmp/etcd`
+
 const kindPortMapping = `
   - containerPort: %d
     hostPort: %d
@@ -62,6 +70,8 @@ type Options struct {
 	Version string
 	// Path to Kubeconfig
 	Kubeconfig string
+	// UseEtcdRAMDisk
+	UseEtcdRAMDisk bool
 }
 
 // Config contains the configuration for creating a cluster
@@ -117,6 +127,10 @@ func (c *Config) Render() (string, error) {
 		fmt.Fprintf(&config, "\n- role: worker")
 	}
 
+	if c.options.UseEtcdRAMDisk {
+		fmt.Fprintf(&config, "\n%s", etcdPatch)
+	}
+
 	return config.String(), nil
 }
 

pkg/testutils/e2e/cluster/cluster.go

@@ -21,15 +21,16 @@ type PostInstall func(ctx context.Context, cluster E2eCluster) error
 
 // E2eClusterConfig defines the configuration of a e2e test cluster
 type E2eClusterConfig struct {
-	Name        string
-	Images      []string
-	IngressAddr string
-	IngressPort int32
-	PostInstall []PostInstall
-	Reuse       bool
-	Wait        time.Duration
-	AutoCleanup bool
-	Kubeconfig  string
+	Name           string
+	Images         []string
+	IngressAddr    string
+	IngressPort    int32
+	PostInstall    []PostInstall
+	Reuse          bool
+	Wait           time.Duration
+	AutoCleanup    bool
+	Kubeconfig     string
+	UseEtcdRAMDisk bool
 }
 
 // E2eCluster defines the interface for accessing an e2e cluster
@@ -116,6 +117,7 @@ func DefaultE2eClusterConfig() E2eClusterConfig {
 		PostInstall: []PostInstall{
 			InstallContourIngress,
 		},
+		UseEtcdRAMDisk: true,
 	}
 }
 
@@ -178,6 +180,14 @@ func WithReuse(reuse bool) E2eClusterOption {
 	}
 }
 
+// WithEtcdRAMDisk specifies if the cluster must be configured to use a RAM disk for Etcd
+func WithEtcdRAMDisk(ramdisk bool) E2eClusterOption {
+	return func(c E2eClusterConfig) (E2eClusterConfig, error) {
+		c.UseEtcdRAMDisk = ramdisk
+		return c, nil
+	}
+}
+
 // e2eCluster maintains the status of a cluster
 type e2eCluster struct {
 	cluster *cluster.Cluster
@@ -199,6 +209,7 @@ func createE2eCluster(e2eConfig E2eClusterConfig) (*e2eCluster, error) {
 					NodePort: 80,
 				},
 			},
+			UseEtcdRAMDisk: e2eConfig.UseEtcdRAMDisk,
 		},
 	)
 	if err != nil {
@@ -236,6 +247,7 @@ func createE2eCluster(e2eConfig E2eClusterConfig) (*e2eCluster, error) {
 func mergeEnvVariables(config E2eClusterConfig) E2eClusterConfig {
 	config.AutoCleanup = utils.GetBooleanEnvVar("E2E_AUTOCLEANUP", config.AutoCleanup)
 	config.Reuse = utils.GetBooleanEnvVar("E2E_REUSE", config.Reuse)
+	config.UseEtcdRAMDisk = utils.GetBooleanEnvVar("E2E_ETCD_RAMDISK", config.UseEtcdRAMDisk)
 	return config
 }