openstack/ironic
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Merge "Update docs on ironic boot mode management"

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Zuul 2018-08-08 08:17:54 +00:00 committed by Gerrit Code Review
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doc/source/install/include/boot-mode.inc
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Boot mode support
-----------------
Most of the bare metal drivers (including the generic ``ipmi`` hardware type)
support setting of boot mode (Legacy BIOS or UEFI). The boot modes can be
configured in the Bare Metal service in the following way:
Some of the bare metal hardware types (namely, ``redfish``, ``ilo`` and
generic ``ipmi``) support setting boot mode (Legacy BIOS or UEFI).
* When no boot mode setting is provided, these drivers default the boot_mode
to Legacy BIOS.
.. note::
Setting boot mode support in generic ``ipmi`` driver is coupled
with setting boot device. That makes boot mode support in the
``ipmi`` driver incomplete.
.. note::
In this chapter we will distinguish *ironic node* from *bare metal node*.
The difference is that *ironic node* refers to a logical node, as it is
configured in ironic, while *bare metal node* indicates the hardware
machine that ironic is managing.
The following rules apply in order when ironic manages node boot mode:
* If the hardware type (or bare metal node) does not implement reading
current boot mode of the bare metal node, then ironic assumes that
boot mode is not set on the bare metal node
* If boot mode is not set on ironic node and bare metal node boot mode
is unknown (not set, can't be read etc.), ironic node boot mode
is set to the value of the `[deploy]/default_boot_mode` option
* If boot mode is set on a bare metal node, but is not set on ironic
node, bare metal node boot mode is set on ironic node
* If boot mode is set on ironic node, but is not set on the bare metal
node, ironic node boot mode is attempted to be set on the bare metal
node (failure to set boot mode on the bare metal node will not fail
ironic node deployment)
* If different boot modes appear on to be set ironic node and on the
bare metal node, ironic node boot mode is attempted to be set on
the bare metal node (failure to set boot mode on the bare metal
node will fail ironic node deployment)
.. warning::
If a bare metal node does not support setting boot mode, then
the operator needs to make sure that boot mode configuration is
consistent between ironic node and the bare metal node.
The boot modes can be configured in the Bare Metal service in the
following way:
* Only one boot mode (either ``uefi`` or ``bios``) can be configured for
the node.