diff --git a/Makefile b/Makefile
index df90240..104cff8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-IMAGE_TAG ?= docker.educg.net/cg/k8s-manager:v1.1.0
+IMAGE_TAG ?= docker.educg.net/cg/k8s-manager:v1.1.1
 
 build: export CGO_ENABLED=0
 build: export GOOS=linux
diff --git a/main.go b/main.go
index f6814a2..ed1f6c0 100644
--- a/main.go
+++ b/main.go
@@ -164,6 +164,7 @@ func Test(c *gin.Context) {
 			c.Abort()
 			return
 		}
+		log.WithField("user name", username).Info("Login success.")
 		c.SetCookie("Authorization", "Bearer "+token, 0, "", "", false, false)
 		c.Header("Authorization", "Bearer "+token)
 		c.Header("Cache-Control", "no-store")
diff --git a/src/orm.go b/src/orm.go
index cf1605e..2f00370 100644
--- a/src/orm.go
+++ b/src/orm.go
@@ -56,6 +56,7 @@ func checkdb(cnt int) *gorm.DB {
 			if err != nil {
 				logrus.WithError(err).Errorf("Close error %d.", cnt)
 			}
+			instance = nil
 			ans = nil
 		}
 	}
@@ -67,5 +68,6 @@ func DB() *gorm.DB {
 	if ans != nil {
 		return ans
 	}
+	instance = nil
 	return checkdb(2)
 }