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12.7. Editing kernel arguments in bootc systems

12.7. Editing kernel arguments in bootc systems

To perform machine local changes, you also can edit kernel arguments on a bootc system or an rpm-ostree system, by using the rpm-ostree kargs command. The changes are made through the user/lib/bootc/kargs.d path, which also handles Day 2 changes, besides the first boot changes.

The following are the options that you can use to add, modify or remove kernel arguments.

rpm-ostree kargs

--append=KEY=VALUE: Appends a kernel argument. It is useful with, for example, console= that can be used multiple times. You can use an empty value for an argument.
--replace=KEY=VALUE=NEWVALUE: Replaces an existing kernel argument. You can replace an argument with KEY=VALUE only if one value already exists for that argument.
--delete=KEY=VALUE: Deletes a specific kernel key-value pair argument or an entire argument with a single key-value pair.
--append-if-missing=KEY=VALUE: Appends a kernel argument. Does nothing if the key is already present.
--delete-if-present=KEY=VALUE: Deletes a specific kernel key-value pair argument. Does nothing if the key is missing.
--editor: Uses an editor to modify the kernel arguments.

Prerequisites

You created a container image.

Procedure

Append a kernel argument, for example:

# rpm-ostree kargs --append debug
Staging deployment... done
Freed: 40.1 MB (pkgcache branches: 0)
Changes queued for next boot. Run "systemctl reboot" to start a reboot

Check the help for more information:
```
# rpm-ostree kargs --help
```

12.7. Editing kernel arguments in bootc systems

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