Enable cloud-init without any aid from ds-identify

Author: weizhouapache

source/adminguide/templates/_cloud_init.rst

@@ -62,6 +62,11 @@ These features can be implemented in `“Linux Template creation process” <_cr
      datasource:
        CloudStack: {}
        None: {}
+
+   .. note::
+      There is a known issue that ds-identify is not able to detect if CloudStack DataSource is enabled and run, if the vm instance is running on VMware or XenServer/XCP-ng. To fix the problem, please run the following command to enable cloud-init without any aid from ds-identify.
+
+        echo "policy: enabled" >  /etc/cloud/ds-identify.cfg
 
 #. **Password management**