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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.
+:::