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modules/ROOT/pages/_partials/proc_booting-specific-kernel-default.adoc
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[[booting_specific_kernel_default]]
== Setting an installed kernel to boot by default
To set a specific installed kernel to boot by default, use the following command
To set a specific installed kernel to boot by default, first check the kernels installed on the system.
----
sudo grubby --set-default /boot/vmlinuz-n.nn.nn-nnn.fcnn.x86_64
sudo ls /boot | grep vmlinuz
----
Identify the kernel to be set to boot by default.
Use the following command to set the default kernel to boot:
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sudo grubby --set-default /boot/vmlinuz-<version>.<release>.<arch>
----
Here is a sample output (on an `x84_64` architecture system):
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sudo ls /boot | grep vmlinuz
vmlinuz-0-rescue-c722f5f7d614446b99c39b846c2bb76c
vmlinuz-5.12.18-200.fc33.x86_64
vmlinuz-5.8.15-301.fc33.x86_64
----
If `vmlinuz-<version>.<release>.<arch>` is chosen to be set as the default, we issue the following command:
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sudo grubby --set-default /boot/vmlinuz-<version>.<release>.<arch>
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For the above scenario, the command will look like so
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sudo grubby --set-default /boot/vmlinuz-5.12.18-200.fc33.x86_64
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where `vmlinuz-n.nn.nn-nnn.fcnn` is the version of installed kernel as can be found in the `/boot` directory.
[[sect-references]]
=== References:
* https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/kernel-module-driver-configuration/Working_with_the_GRUB_2_Boot_Loader/[Fedora Rawhide Docs :: Working with the GRUB 2 Boot Loader]
* https://docs.fedoraproject.org/en-US/Fedora/23/html/System_Administrators_Guide/sec-Configuring_GRUB_2_Using_the_grubby_Tool.html[Using the grubby tool]