25.6.14.3 NDB File System Encryption Limitations

Transparent data encryption in NDB Cluster is subject to the following restrictions and limitations:

• The file system password must be supplied to each individual data node.

• File system password rotation requires an initial rolling restart of the data nodes; this must be performed manually, or by an application external to NDB).

• For a cluster with only a single replica (NoOfReplicas = 1), a full backup and restore is required for file system password rotation.

• Rotation of all data encryption keys requires an initial node restart.

NDB TDE and NDB Replication.  The use of an encrypted filesystem does not have any effect on NDB Replication. All of the following scenarios are supported:

• Replication of an NDB Cluster having an encrypted file system to an NDB Cluster whose file system is not encrypted.

• Replication of an NDB Cluster whose file system is not encrypted to an NDB Cluster whose file system is encrypted.

• Replication of an NDB Cluster whose file system is encrypted to a standalone MySQL server using InnoDB tables which are not encrypted.

• Replication of an NDB Cluster with an unencrypted file system to a standalone MySQL server using InnoDB tables with file sytem encryption.