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(boot-options)=
# Boot Options
:::{warning}
This function may be highly disruptive.
It may cause major service interruption, so make sure you really
need it and verify your input carefully.
:::
VyOS has several kernel command line options to modify the normal boot
process.
To add an option, select the desired image in GRUB menu at load
time, press **e**, edit the first line, and press **Ctrl-x** to boot when
ready.
```{image} /_static/images/boot-options.webp
:align: center
:width: 80%
```
## Specify custom config file
Tells the system to use specified file instead of `/config/config.boot`.
If specified file does not exist or is not readable, fall back to
default config. No additional verification is performed, so make sure
you specify a valid config file.
```none
vyos-config=/path/to/file
```
To load the *factory default* config, use:
```none
vyos-config=/opt/vyatta/etc/config.boot.default
```
## Disable specific boot process steps
These options disable some boot steps. Make sure you understand the
{ref}`boot process <boot-steps>` well before using them!
```{eval-rst}
.. glossary::
no-vyos-migrate
Do not perform config migration.
no-vyos-firewall
Do not initialize default firewall chains, renders any firewall
configuration unusable.
```
|
