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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+========================================
+Override PXE options via Glance property
+========================================
+
+https://blueprints.launchpad.net/ironic/+spec/override-pxe-options-via-glance-property
+
+The proposal presents the work required to allow PXE boot an image using
+a specific kernel command line for that image.
+
+Problem description
+===================
+
+Some images requires having specific kernel command line to boot
+correctly. Currently, Ironic tries to determine things like the root
+filesystem the image is on ("root=" kernel command line) by getting the
+UUID of the image filesystem and setting as the root= parameter. This is
+not correct for all images because some may need to boot from a different
+root filesystem, e.g:
+
+ * The device path of its LVM volume [root=/dev/mapper/vg-lv_root]
+ * From one squashfs filesystem [root=live:<path>]
+ * A btrfs subvolume [root=/dev/disk/by-uuid/<UUID of btrfs-root>]
+
+As a real example, the Fedora Atomic uses ``lvm`` and ``ostree``. It
+requires a kernel command line as the example below to boot properly::
+
+  nofb nomodeset vga=normal console=tty1 no_timer_check
+  rd.lvm.lv=atomicos/root root=/dev/mapper/atomicos-root
+  ostree=/ostree/boot.0/fedora-atomic/a002a2c2e44240db614e09e82c/0
+
+Proposed change
+===============
+
+In the same way Ironic look at the Glance image properties to find out the
+Glance UUID for the image's kernel and ramdisk (kernel_id and ramdisk_id)
+and populate the node's ``instance_info`` field with the ``kernel`` and
+``ramdisk`` keys.
+
+This spec propose having a new image's property field called
+``kernel_cmdline`` that Ironic will look at, and if present, it will
+populate the node's ``instance_info`` field with a ``kernel_cmdline``
+key.
+
+If the ``instance_info.kernel_cmdline`` is populate Ironic will skip
+getting the root partition filesystem UUID and will use the command
+line from the ``instance_info`` field instead of the default one in
+the template. It's important to note that the values present at the
+``pxe_append_params`` configuration option will still be appended at
+the end of the image's custom kernel command line by Ironic.
+
+Setting the keys in the ``instance_info`` field is important because
+it also allows Ironic to operate in standalone mode without Glance.
+
+Alternatives
+------------
+Always use whole disk images when deploying images that requires a
+specific kernel command line
+
+Data model impact
+-----------------
+None
+
+State Machine Impact
+--------------------
+None
+
+REST API impact
+---------------
+None
+
+RPC API impact
+--------------
+None
+
+Driver API impact
+-----------------
+None
+
+Nova driver impact
+------------------
+None
+
+Security impact
+---------------
+None
+
+Other end user impact
+---------------------
+None
+
+Scalability impact
+------------------
+None
+
+Performance Impact
+------------------
+None
+
+Other deployer impact
+---------------------
+
+Deployers that wants to deploy an image with a specific kernel command
+line should know and set it in Glance image's property prior to trying
+to boot the image.
+
+Developer impact
+----------------
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  lucasagomes <lucasagomes@gmail.com>
+
+Other contributors:
+  None
+
+Work Items
+----------
+
+* Make Ironic look at the ``kernel_cmdline`` image property in Glance
+  and if present set it to the node's ``instance_info`` field
+
+* When preparing to boot the user's image, make Ironic check if the
+  node's ``instance_info`` field contains a key called ``kernel_cmdline``
+  (along with ``kernel_id`` and ``ramdisk_id``) and if so, use that kernel
+  command line to boot the image.
+
+Dependencies
+============
+None
+
+Testing
+=======
+
+* Unit Tests
+
+Upgrades and Backwards Compatibility
+====================================
+None
+
+Documentation Impact
+====================
+
+The Ironic deploy documentation will be updated to reflect the changes
+made by this spec.
+
+References
+==========
+
+* `Kernel parameters <https://www.kernel.org/doc/Documentation/kernel-parameters.txt>`_
+
+* `Project atomic <http://www.projectatomic.io>`_