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At his point you should be in the /opt/devstack directory and running as the stack user. In a previous step you assigned ownership of this directory to the stack user, so there shouldn’t be any problems related to directory permissions.

V. K. Cody Bumgardner (2015-04-12 22:00:00+00:00). OpenStack in Action MEAP V10 (Kindle Locations 729-731). Manning Publications Co.. Kindle Edition.

Instead of "At his point" it should read, "At this point"