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Support dracut booting with GRUB

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Signed-off-by: Jonathon Anderson <janderson@ciq.com>
This commit is contained in:
Jonathon Anderson
2024-06-06 03:08:43 -04:00
parent 9500487ad3
commit 05b951d78d
4 changed files with 70 additions and 6 deletions
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21
userdocs/contents/boot-management.rst
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@@ -74,10 +74,27 @@ booting the node image directly.
The iPXE template may be set at the node or profile level.
Alternatively, to direct GRUB to fetch the node's initramfs image and boot with
dracut semantics, set a ``GrubMenuEntry`` tag for the node.
.. note::
Warewulf configures GRUB with a template located at
``/etc/warewulf/grub/grub.cfg.ww``. Inspect the template to learn more about
the dracut booting process.
.. code-block:: shell
wwctl node set wwnode1 --tagadd GrubMenuEntry=dracut
.. note::
The ``GrubMenuEntry`` variable may be set at the node or profile level.
During boot, ``warewulfd`` will detect and dynamically serve an
initramfs from a node's container image in much the same way that it
can serve a kernel from a container image. This image is loaded by
iPXE, and iPXE directs dracut to fetch the node's container image
iPXE (or GRUB) which directs dracut to fetch the node's container image
during boot.
The wwinit module provisions to tmpfs. By default, tmpfs is permitted
@@ -88,7 +105,7 @@ more details.)
.. warning::
Kernel overrides are not currently supported during dracut initramfs boot.
Kernel overrides are not currently fully supported during dracut initramfs boot.
Booting with GRUB
=================