diff --git a/de/heat-templates/fragments/SrvInstancesVMCeph.yaml b/de/heat-templates/fragments/SrvInstancesVMCeph.yaml
index ad401cc..dce451e 100644
--- a/de/heat-templates/fragments/SrvInstancesVMCeph.yaml
+++ b/de/heat-templates/fragments/SrvInstancesVMCeph.yaml
@@ -56,6 +56,15 @@
   hardware_metadata:
     description: The content of lab metadata.
     type: string
+  user_data_config:
+    description: This is part of clout-config which denies to mount drive with label ephemeral0 to /mnt
+    type: string
+    default: |
+      #cloud-config
+      #
+      # Don't mount ephemeral0 to /mnt as it's by default
+      mounts:
+        - [ ephemeral0, null ]
 
 resources:
 
@@ -103,6 +112,7 @@
       parts:
       - config: {get_resource: software_config}
       - config: {get_resource: inject_files}
+      - config: {get_param: user_data_config}
 
   server:
     type: OS::Nova::Server
diff --git a/de/heat-templates/fragments/SrvInstancesVMCephOSD.yaml b/de/heat-templates/fragments/SrvInstancesVMCephOSD.yaml
index a302144..f78a198 100644
--- a/de/heat-templates/fragments/SrvInstancesVMCephOSD.yaml
+++ b/de/heat-templates/fragments/SrvInstancesVMCephOSD.yaml
@@ -64,6 +64,15 @@
   hardware_metadata:
     description: The content of lab metadata.
     type: string
+  user_data_config:
+    description: This is part of clout-config which denies to mount drive with label ephemeral0 to /mnt
+    type: string
+    default: |
+      #cloud-config
+      #
+      # Don't mount ephemeral0 to /mnt as it's by default
+      mounts:
+        - [ ephemeral0, null ]
 
 resources:
 
@@ -114,6 +123,7 @@
       parts:
       - config: {get_resource: software_config}
       - config: {get_resource: inject_files}
+      - config: {get_param: user_data_config}
 
   server:
     type: OS::Nova::Server