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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.webp
:align: center
:width: 80%
```
## 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.
```none
vyos-config=/path/to/file
```
To load the *factory default* configuration, use:
```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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