Especially if you are interested in restoring a database server from a primary backup:
The instructions for “Restore a Database from a Primary Backup” in this runbook for PostgreSQL – Database Manager for PostgreSQL 9.1 (v13.5 LTS) – Runbook – resulted in continual failure no matter what I tried.
After coming across this post – How can I manually reattach and mount my Rightscale created database EBS volumes? – it occurred to me to try and Detach the automatically mounted 2 volumes BEFORE running “db::do_primary_restore_and_become_master”.
This proved successful, with all data restored correctly.
I cross-checked the MySQL runbooks and they had the same problem.