diff --git a/src/lib/cache/redis/util.go b/src/lib/cache/redis/util.go
index d55907347..f6b25ca71 100644
--- a/src/lib/cache/redis/util.go
+++ b/src/lib/cache/redis/util.go
@@ -27,6 +27,11 @@ import (
 	"github.com/goharbor/harbor/src/lib/errors"
 )
 
+var (
+	// defaultDBIndex defines the default redis db index
+	defaultDBIndex = 0
+)
+
 // ParseSentinelURL parses sentinel url to redis FailoverOptions.
 // It's a modified version of go-redis ParseURL(https://github.com/go-redis/redis/blob/997118894af9d4244d4a471f2b317eead9c9ca62/options.go#L222) because official version does
 // not support parse sentinel mode.
@@ -45,15 +50,20 @@ func ParseSentinelURL(redisURL string) (*redis.FailoverOptions, error) {
 		return r == '/'
 	})
 	// expect path length is 2, example: [mymaster 1]
-	if len(f) != 2 {
+	// but if the db is default(0) which can be ignored, so when the path length is 1, then set db to 0
+	switch len(f) {
+	case 1:
+		o.MasterName = f[0]
+		o.DB = defaultDBIndex
+	case 2:
+		o.MasterName = f[0]
+		if o.DB, err = strconv.Atoi(f[1]); err != nil {
+			return nil, errors.Errorf("redis: invalid database number: %q", f[1])
+		}
+	default:
 		return nil, errors.Errorf("redis: invalid redis URL path: %s", u.Path)
 	}
 
-	o.MasterName = f[0]
-	if o.DB, err = strconv.Atoi(f[1]); err != nil {
-		return nil, errors.Errorf("redis: invalid database number: %q", f[1])
-	}
-
 	return setupConnParams(u, o)
 }
 
diff --git a/src/lib/cache/redis/util_test.go b/src/lib/cache/redis/util_test.go
index 0e3d0fe0f..9d862e537 100644
--- a/src/lib/cache/redis/util_test.go
+++ b/src/lib/cache/redis/util_test.go
@@ -22,9 +22,16 @@ import (
 )
 
 func TestParseSentinelURL(t *testing.T) {
-	url := "redis+sentinel://anonymous:password@host1:26379,host2:26379/mymaster/1?idle_timeout_seconds=30&max_retries=10&min_retry_backoff=1&max_retry_backoff=10&dial_timeout=30&read_timeout=5&write_timeout=5&pool_fifo=true&pool_size=1000&min_idle_conns=100&max_conn_age=10&pool_timeout=10"
+	// db index should be set to 0 if not specified
+	url := "redis+sentinel://anonymous:password@host1:26379,host2:26379/mymaster/?idle_timeout_seconds=30"
 	o, err := ParseSentinelURL(url)
 	assert.NoError(t, err)
+	assert.Equal(t, 0, o.DB)
+
+	// test options from query
+	url = "redis+sentinel://anonymous:password@host1:26379,host2:26379/mymaster/1?idle_timeout_seconds=30&max_retries=10&min_retry_backoff=1&max_retry_backoff=10&dial_timeout=30&read_timeout=5&write_timeout=5&pool_fifo=true&pool_size=1000&min_idle_conns=100&max_conn_age=10&pool_timeout=10"
+	o, err = ParseSentinelURL(url)
+	assert.NoError(t, err)
 	assert.Equal(t, "anonymous", o.Username)
 	assert.Equal(t, "password", o.Password)
 	assert.Equal(t, []string{"host1:26379", "host2:26379"}, o.SentinelAddrs)
@@ -44,7 +51,7 @@ func TestParseSentinelURL(t *testing.T) {
 	assert.Equal(t, 10*time.Second, o.PoolTimeout)
 
 	// invalid url should return err
-	url = "invalid"
+	url = "###"
 	_, err = ParseSentinelURL(url)
 	assert.Error(t, err, "invalid url should return err")