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Move "provision to disk" documentation to "provisioning disks" section

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Signed-off-by: Jonathon Anderson <janderson@ciq.com>
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Jonathon Anderson
2025-07-01 00:05:30 -06:00
parent f2b091d4cb
commit b74e326212
2 changed files with 114 additions and 114 deletions
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userdocs/server/bootloaders.rst
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@@ -396,117 +396,3 @@ The wwinit module provisions to tmpfs. By default, tmpfs is permitted to use up
to 50% of physical memory. This size limit may be adjusted using the kernel
argument `wwinit.tmpfs.size`. (This parameter is passed to the `size` option
during tmpfs mount. See ``tmpfs(5)`` for more details.)
.. _provision to disk:
Provision to disk
=================
*New in Warewulf v4.6.2*
As a tech preview, the Warewulf two-stage boot process can provision the node
image to local storage.
.. warning::
This functionality is a technology preview and should be used with care. Pay
specific attention to ``wipeFilesytem`` (ignition) and ``overwrite`` (mkfs)
settings.
.. note::
Warewulf doesn't install a bootloader to the disk or add UEFI entries. Nodes
still request an image and configuration from the Warewulf server on every
boot.
.. note::
While provisioning to disk should be possible during a single-stage boot, not
all features are available:
- Warewulf does not perform hardware detection to ensure that necessary
kernel modules are loaded prior to init.
- Warewulf does not load udev to ensure that ``/dev/disk/by-*`` symlinks are
available prior to init.
With Ignition
-------------
Warewulf needs a prepared file system to deploy the image to. Warewulf can
provision this file system using Ignition. To use Ignition, include ``ignition``
in your system overlay. The ignition overlay provisions disks during init and,
optionally, during the first stage of a two-stage boot. This allows the
root file system to be provisioned before the image is loaded.
.. code-block:: shell
wwctl node set wwnode1 \
--diskname /dev/vda --diskwipe \
--partname rootfs --partcreate --partnumber 1 \
--fsname rootfs --fsformat ext4 --fspath /
In order to allow Dracut to provision the disk, partition, and file system,
Ignition must be included in the Dracut image.
.. code-block:: shell
wwctl image exec rockylinux-9 -- /usr/bin/dracut --force --no-hostonly --add wwinit --add ignition --regenerate-all
The necessary file system may alternatively be prepared out-of-band.
With sfdisk and mkfs
--------------------
Systems that do not have access to Ignition (e.g., Rocky Linux 8) can provision
the root file system using a combination of ``sfdisk`` and ``mkfs``. To use
them, include ``sfdisk`` and ``mkfs`` in your system overlay. The ``sfdisk`` and
``mkfs`` overlays provision disk and file systems during the first stage of a
two-stage boot. This allows the root file system to be provisioned before the
image is loaded.
Configure the ``sfdisk`` and ``mkfs`` overlays using resources:
.. code-block:: shell
wwctl node set wwnode1 \
--diskname /dev/vda --diskwipe \
--partname rootfs --partcreate --partnumber 1 \
--fsname rootfs --fsformat ext4 --fspath /
In order to allow Dracut to provision the disk, partition, and file system, some
additional commands must be included in the Dracut image, depending on which
functionality is used:
- **sfdisk:** writes the partition table
- **blockdev:** used to re-read the partition table after writing
- **udevadm:** used to trigger udev events after writing the partition table
- **mkfs:** formats file systems (may also require file-system-specific commands like mkfs.ext4)
- **mkfs.ext4**, **mkfs.btrfs**, etc: used by mkfs to format specific file systems
- **wipefs:** used to determine if a file system already exists
.. code-block:: shell
wwctl image exec rockylinux-8 -- /usr/bin/dracut --force --no-hostonly \
--add wwinit \
--install sfdisk \
--install blockdev \
--install udevadm \
--install mkfs \
--install mkfs.ext4 \
--install wipefs \
--regenerate-all
Configuring the root device
---------------------------
Set the desired storage device for the node image using the ``--root``
parameter.
.. code-block:: shell
wwctl node set wwnode1 --root /dev/disk/by-partlabel/rootfs