diff --git a/ironic/drivers/utils.py b/ironic/drivers/utils.py
index 65902bf031..860a89922a 100644
--- a/ironic/drivers/utils.py
+++ b/ironic/drivers/utils.py
@@ -269,7 +269,7 @@ def get_ramdisk_logs_file_name(node):
     :param node: A node object.
     :returns: The log file name.
     """
-    timestamp = timeutils.utcnow().strftime('%Y-%m-%d-%H:%M:%S')
+    timestamp = timeutils.utcnow().strftime('%Y-%m-%d-%H-%M-%S')
     file_name_fields = [node.uuid]
     if node.instance_uuid:
         file_name_fields.append(node.instance_uuid)
diff --git a/ironic/tests/unit/drivers/test_utils.py b/ironic/tests/unit/drivers/test_utils.py
index c0952bf078..4a1bc7f94b 100644
--- a/ironic/tests/unit/drivers/test_utils.py
+++ b/ironic/tests/unit/drivers/test_utils.py
@@ -260,7 +260,7 @@ class UtilsRamdiskLogsTestCase(tests_base.TestCase):
         mock_utcnow.return_value = datetime.datetime(2000, 1, 1, 0, 0)
         name = driver_utils.get_ramdisk_logs_file_name(self.node)
         expected_name = ('1be26c0b-03f2-4d2e-ae87-c02d7f33c123_'
-                         '2000-01-01-00:00:00.tar.gz')
+                         '2000-01-01-00-00-00.tar.gz')
         self.assertEqual(expected_name, name)
 
         # with instance_info
@@ -269,7 +269,7 @@ class UtilsRamdiskLogsTestCase(tests_base.TestCase):
             self.context, instance_uuid=instance_uuid)
         name = driver_utils.get_ramdisk_logs_file_name(node2)
         expected_name = ('1be26c0b-03f2-4d2e-ae87-c02d7f33c123_' +
-                         instance_uuid + '_2000-01-01-00:00:00.tar.gz')
+                         instance_uuid + '_2000-01-01-00-00-00.tar.gz')
         self.assertEqual(expected_name, name)
 
     @mock.patch.object(driver_utils, 'store_ramdisk_logs', autospec=True)
diff --git a/releasenotes/notes/change-ramdisk-log-filename-142b10d0b02a5ca6.yaml b/releasenotes/notes/change-ramdisk-log-filename-142b10d0b02a5ca6.yaml
new file mode 100644
index 0000000000..9f14507dea
--- /dev/null
+++ b/releasenotes/notes/change-ramdisk-log-filename-142b10d0b02a5ca6.yaml
@@ -0,0 +1,13 @@
+---
+upgrade:
+  - |
+    Changes timestamp part of ramdisk log filename by replacing
+    colon with dash. The ``tar`` command does not handle colon
+    properly, and untar of the file with colon in filename will
+    fail.
+fixes:
+  - |
+    Changes timestamp part of ramdisk log filename by replacing
+    colon with dash. The ``tar`` command does not handle colon
+    properly, and untar of the file with colon in filename will
+    fail.