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Fixing Nova configuration (Devstack)

I've been struggling getting Devstack to run to completion, both Stein and Rocky. Yesterday I discovered "journalctl" and it tells me that I'm having trouble with DBConnection using as the address.

ERROR nova.servicegroup.drivers.db DBConnectionError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on ''

When I was trying to install every component by hand, the connection was always to the named host ("controller"), so this is surprising to me. What's the best way to fix this (if in fact, it's fixable)?