Important: If you are using SSH software other than OpenSSH, the initialization fails. To prevent this, pre-create the SSH key before continuing:

$ sudo -u keytrustee ssh-keygen -t rsa -f /var/lib/keytrustee/.ssh/id_rsa

For new installations, use the Set up HDFS Data At Rest Encryption wizard and follow the instructions in Enabling HDFS Encryption Using the Wizard. When prompted, deselect the Enable High Availability option to proceed in standalone mode.

To set up Key Trustee Server manually, add the Key Trustee Server service to your cluster, following the instructions in Adding a Service. When customizing role assignments, assign only the Active Key Trustee Server and Active Database roles.

  Important: You must assign the Key Trustee Server and Database roles to the same host. Key Trustee Server does not support running the database on a different host.

For parcel-based Key Trustee Server releases 5.8 and higher, Cloudera Manager automatically backs up Key Trustee Server (using the ktbackup.sh script) after adding the Key Trustee Server service. It also schedules automatic backups using cron. For package-based installations, you must manually back up Key Trustee Server and configure a cron job.

Cloudera Manager configures cron to run the backup script hourly. The latest 10 backups are retained in /var/lib/keytrustee in cleartext. For information about using the backup script and configuring the cron job (including how to encrypt backups), see Backing Up Key Trustee Server and Key Trustee KMS Using the ktbackup.sh Script.