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---
fixes:
- |
Fixes database schema that could cause the wrong database engine to be
utilized for the ``conductor_hardware_interfaces`` table, if the system
is using MySQL prior to version 5.5 or the ``default_storage_engine``
option is set explicitly to 'MyISAM' in ``my.cnf``.
In this case, a table could be created with MyISAM engine, and the foreign
key constraint ``conductor_id(conductors.id)`` was ignored.
See `bug 1702158 <https://bugs.launchpad.net/ironic/+bug/1702158>`_
for details.
upgrade:
- |
Due to `bug 1702158 <https://bugs.launchpad.net/ironic/+bug/1702158>`_,
the ``conductor_hardware_interfaces`` table could be created with MyISAM
database engine, while all other tables in ironic database are
using InnoDB engine. This could happen during initial installation, or
upgrade to the Ocata release, if the system was using MySQL prior to
version 5.5 or the ``default_storage_engine`` option was set explicitly
to 'MyISAM' in ``my.cnf``. If this is the case, the
``conductor_hardware_interfaces`` table needs to be manually migrated
to InnoDB, and the foreign key constraint needs to be re-created::
alter table conductor_hardware_interfaces engine='InnoDB';
alter table conductor_hardware_interfaces
add constraint conductor_hardware_interfaces_ibfk_1
foreign key (conductor_id) references conductors(id);
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