Comment 3 for bug 816236

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Thierry Carrez (ttx) wrote : Re: Initial 'nova db sync' migration failure on mysql due to foreign key reference

This only happens if the database was originally created as InnoDB (and not migrated to InnoDB at 022_set_engine_mysql_innodb.py). To reproduce, add 'default_storage_engine = InnoDB' to the [mysqld] section of /etc/mysql/my.cnf before creating the nova database.