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:lastproofread: 2025-11-14
.. _boot-options:
############
Boot Options
############
.. warning:: This function can disrupt services.
Run it only when necessary, and verify all input values before proceeding.
VyOS provides several kernel command-line options to modify the normal boot
process.
To add an option, select the desired image in the GRUB menu at load time.
Type **e** to edit the first line, then type **Ctrl+X** to boot.
.. image:: /_static/images/boot-options.*
:width: 80%
:align: center
Specify custom config file
==========================
You can use a configuration file instead of the default ``/config/config.boot``
file.
If the specified file doesn't exist or isn't readable, the system uses the
default configuration file.
No additional verification is performed, so specify a valid configuration file.
.. code-block:: none
vyos-config=/path/to/file
To load the *factory default* configuration, use:
.. code-block:: none
vyos-config=/opt/vyatta/etc/config.boot.default
Disable specific boot process steps
===================================
These options disable certain steps in the boot process. Understand the
:ref:`boot process <boot-steps>` before using them.
.. glossary::
no-vyos-migrate
Do not perform config migration.
no-vyos-firewall
Do not initialize default firewall chains, renders any firewall
configuration unusable.
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