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===========================
Setting kernel boot options
===========================
MAAS is able to send specific kernel options to booting nodes on both
a global basis and a per-node basis.
Global kernel options
---------------------
As an admin, click on the gear icon at the top right and scroll down to
the Global Kernel Parameters section, as shown here:
.. image:: media/global_kernel_opts.png
Whatever you set here is sent as-is to all booting nodes.
Per-node kernel options
-----------------------
Per-node kernel options are set using tags. The easiest way of doing this
is to use the ``maas`` command. You will need to :ref:`be
logged in to the API first <api-key>` and then you can add a tag which has its
``kernel_opts`` value set, like this::
$ maas maas tags new name='nomodeset' \
comment='nomodeset kernel option' kernel_opts='nomodeset vga'
Once the tag is defined, you can add it to a node or nodes::
$ maas maas tag update-nodes nomodeset add=<system_id_1> \
add=<system_id_2>
.. note::
Any per-node kernel options set will completely override the global options.
If multiple tags attached to a node have the kernel_opts defined, the first
one ordered by name is used.
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