diff --git a/lntest/node/config.go b/lntest/node/config.go
index bd003eb01..694e26c3e 100644
--- a/lntest/node/config.go
+++ b/lntest/node/config.go
@@ -7,6 +7,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"time"
 
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/integration/rpctest"
@@ -28,6 +29,10 @@ const (
 )
 
 var (
+	// baseDirFlag is the default directory where all the node's data are
+	// saved. If not set, a temporary dir will be created.
+	baseDirFlag = flag.String("basedir", "", "default dir to save data")
+
 	// logOutput is a flag that can be set to append the output from the
 	// seed nodes to log files.
 	logOutput = flag.Bool("logoutput", false,
@@ -162,6 +167,11 @@ type BaseNodeConfig struct {
 	// compiled with all required itest flags.
 	LndBinary string
 
+	// SkipCleanup specifies whether the harness will remove the base dir or
+	// not when the test finishes. When using customized BaseDir, the
+	// cleanup will be skipped.
+	SkipCleanup bool
+
 	// backupDBDir is the path where a database backup is stored, if any.
 	backupDBDir string
 
@@ -223,6 +233,38 @@ func (cfg *BaseNodeConfig) BaseConfig() *BaseNodeConfig {
 	return cfg
 }
 
+// GenBaseDir creates a base dir that's used for the test.
+func (cfg *BaseNodeConfig) GenBaseDir() error {
+	// Exit early if the BaseDir is already set.
+	if cfg.BaseDir != "" {
+		return nil
+	}
+
+	dirBaseName := fmt.Sprintf("itest-%v-%v-%v-%v", cfg.LogFilenamePrefix,
+		cfg.Name, cfg.NodeID, time.Now().Unix())
+
+	// Create a temporary directory for the node's data and logs. Use dash
+	// suffix as a separator between base name and node ID.
+	if *baseDirFlag == "" {
+		var err error
+
+		cfg.BaseDir, err = os.MkdirTemp("", dirBaseName)
+
+		return err
+	}
+
+	// Create the customized base dir.
+	if err := os.MkdirAll(*baseDirFlag, 0700); err != nil {
+		return err
+	}
+
+	// Use customized base dir and skip the cleanups.
+	cfg.BaseDir = filepath.Join(*baseDirFlag, dirBaseName)
+	cfg.SkipCleanup = true
+
+	return nil
+}
+
 // GenArgs generates a slice of command line arguments from the lightning node
 // config struct.
 func (cfg *BaseNodeConfig) GenArgs() []string {
diff --git a/lntest/node/harness_node.go b/lntest/node/harness_node.go
index 4cfd9a501..87dfa9ce6 100644
--- a/lntest/node/harness_node.go
+++ b/lntest/node/harness_node.go
@@ -93,18 +93,10 @@ type HarnessNode struct {
 // NewHarnessNode creates a new test lightning node instance from the passed
 // config.
 func NewHarnessNode(t *testing.T, cfg *BaseNodeConfig) (*HarnessNode, error) {
-	if cfg.BaseDir == "" {
-		var err error
-
-		// Create a temporary directory for the node's data and logs.
-		// Use dash suffix as a separator between base name and random
-		// suffix.
-		dirBaseName := fmt.Sprintf("lndtest-node-%s-", cfg.Name)
-		cfg.BaseDir, err = os.MkdirTemp("", dirBaseName)
-		if err != nil {
-			return nil, err
-		}
+	if err := cfg.GenBaseDir(); err != nil {
+		return nil, err
 	}
+
 	cfg.DataDir = filepath.Join(cfg.BaseDir, "data")
 	cfg.LogDir = filepath.Join(cfg.BaseDir, "logs")
 	cfg.TLSCertPath = filepath.Join(cfg.BaseDir, "tls.cert")
@@ -802,6 +794,13 @@ func (hn *HarnessNode) Shutdown() error {
 	if err := hn.Stop(); err != nil {
 		return err
 	}
+
+	// Exit if we want to skip the cleanup, which happens when a customized
+	// base dir is used.
+	if hn.Cfg.SkipCleanup {
+		return nil
+	}
+
 	if err := hn.cleanup(); err != nil {
 		return err
 	}
diff --git a/make/testing_flags.mk b/make/testing_flags.mk
index 1826e00ea..7e4ba5b0e 100644
--- a/make/testing_flags.mk
+++ b/make/testing_flags.mk
@@ -34,6 +34,11 @@ ifneq ($(shuffleseed),)
 SHUFFLE_SEED = $(shuffleseed)
 endif
 
+# Set the base dir if specified.
+ifneq ($(basedir),)
+ITEST_FLAGS += -basedir=$(basedir)
+endif
+
 # Windows needs to append a .exe suffix to all executable files, otherwise it
 # won't run them.
 ifneq ($(windows),)