After User Sync config to LDAP, I can grant permission to LDAP user via Ranger Admin.
But how to use the LDAP user to access HDFS file?
Enable LDAP for Ambari:
Use Ambari View > Files to access HDFS.
If you need access from command line, you will need to enable LDAP on operating system through ldap/sssd etc.
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Is the environment kerberized? Do you have configured SSSD to sync users at the os level?