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You can append kernel arguments. This is useful with e.g. `console=` that can be used multiple times. An empty value for an argument is allowed:
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You can append kernel arguments. An empty value for an argument is allowed:
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Modifying Kernel Arguments
Modificando los Argumentos del Kernel
Modifying Kernel Arguments via Ignition
 
You can specify kernel arguments in a Butane config using the `kernel_arguments` section.
 
Example: Staying on cgroups v1
 
Starting from June 2021, cgroups v2 is the default on new installations of Fedora CoreOS. Here's an example `kernelArguments` section which adds the `systemd.unified_cgroup_hierarchy=0` kernel argument so that the machine keeps using cgroups v1:
 
variant: fcos
version: {butane-latest-stable-spec}
kernel_arguments:
should_exist:
- systemd.unified_cgroup_hierarchy=0
 
Example: Disabling all CPU vulnerability mitigations
 
Here's an example `kernelArguments` section which switches `mitigations=auto,nosmt` to `mitigations=off` to disable all CPU vulnerability mitigations:
 
variant: fcos
version: {butane-latest-stable-spec}
kernel_arguments:
should_exist:
- mitigations=off
should_not_exist:
- mitigations=auto,nosmt
 
Modifying Console Configuration During Bare Metal Install
 
`coreos-installer` has special support for changing the console configuration when performing a bare-metal installation. This functionality can be used to add `console` arguments to the kernel command line and equivalent parameters to the GRUB bootloader configuration. For more information, see xref:emergency-shell.adoc[Emergency Console Access]. For more information about bare metal installs, see xref:bare-metal.adoc[Installing CoreOS on Bare Metal].
 
Modifying Kernel Arguments on Existing Systems
Modificando los Argumentos del Kernel
Kernel arguments changes are managed by `rpm-ostree` via the https://www.mankier.com/1/rpm-ostree[`rpm-ostree kargs`] subcommand. Changes are applied to a new deployment and a reboot is necessary for those to take effect.
Los cambios de los argumentos del kernel son manejados por `rpm-ostree` por medio del sub comando https://www.mankier.com/1/rpm-ostree[`rpm-ostree kargs`]. Los cambios se aplican a un nuevo despliegue y es necesario un reinicio para que tengan efecto.
Adding kernel arguments
Añadiendo argumentos del kernel
You can append kernel arguments. An empty value for an argument is allowed:
Usted puede añadir argumentos al kernel. Esto es útil con e.g. `console=` que se puede utilizar múltiples veces. Se permite un valor vacío para un argumento:
$ sudo rpm-ostree kargs --append=KEY=VALUE
$ sudo rpm-ostree kargs --append=KEY=VALUE
Example: Add reserved memory for Kdump support
Ejemplo: Añadir memoria reservada para soporte Kdump
$ sudo rpm-ostree kargs --append='crashkernel=256M'
$ sudo rpm-ostree kargs --append='crashkernel=256M'
See also xref:debugging-kernel-crashes.adoc[Debugging kernel crashes using kdump].
 
Removing existing kernel arguments
 
You can delete a specific kernel argument key/value pair or an entire argument with a single key/value pair:
 
$ sudo rpm-ostree kargs --delete=KEY=VALUE
 
Example: Re-enable SMT on vulnerable CPUs
 
$ sudo rpm-ostree kargs --delete=mitigations=auto,nosmt
$ sudo rpm-ostree kargs --append=KEY=VALUE
Example: Update an existing system from cgroupsv1 to cgroupsv2 and immediately reboot
 
$ sudo rpm-ostree kargs --delete=systemd.unified_cgroup_hierarchy --reboot
 
Replacing existing kernel arguments
 
You can replace an existing kernel argument with a new value. You can directly use `KEY=VALUE` if only one value exists for that argument. Otherwise, you can specify the new value using the following format:
 
$ sudo rpm-ostree kargs --replace=KEY=VALUE=NEWVALUE
 
Example: Disable all CPU vulnerability mitigations
 

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String updated in the repository

  1. fedora-docs-l10n/fedora-coreos
  2. master/pages/kernel-args
  3. Spanish
You can append kernel arguments. An empty value for an argument is allowed:
Usted puede añadir argumentos al kernel. Esto es útil con e.g. `console=` que se puede utilizar múltiples veces. Se permite un valor vacío para un argumento:
a year ago
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Source string changed

  1. fedora-docs-l10n/fedora-coreos
  2. master/pages/kernel-args
  3. Spanish
You can append kernel arguments. This is useful with e.g. `console=` that can be used multiple times. An empty value for an argument is allowed:
a year ago
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Source string description
type: Plain text
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placeholders:r"`[\w.\/\-_=@&*:$●+~()\] ]*`"
Source string location
pages/kernel-args.adoc:46
String age
a year ago
Last updated
11 months ago
Source string age
a year ago
Translation file
po/es/master/pages/kernel-args.po, string 15