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36
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:
----
sudo grubby --set-default /boot/vmlinuz-<version>.<release>.<arch>
----
Here is a sample output (on an `x84_64` architecture system):
----
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:
----
sudo grubby --set-default /boot/vmlinuz-<version>.<release>.<arch>
----
For the above scenario, the command will look like so
----
sudo grubby --set-default /boot/vmlinuz-5.12.18-200.fc33.x86_64
----
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]

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modules/ROOT/pages/kernel/installing-koji-kernel.adoc
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:description: A quick guide on installing a kernel from the Koji repository.
Koji is the build system Fedora developers use to build software for inclusion into Fedora. If there is a need to install a kernel different from the one that gets installed by default, these can be obtained from the Koji repository.
Koji is the build system Fedora developers use to build software for inclusion into Fedora.
If there is a need to install a kernel that is not currently available in the Fedora repositories,
these can be obtained from the Koji repository.
== Install the koji package
== Check Koji (Fedora build system) for archived builds
The koji package makes this process much easier. Let's install the package:
Check the https://koji.fedoraproject.org/koji/search?match=glob&type=build&terms=kernel-*[Koji] archive for the historical builds.
It is possible to use different searches or expressions to help narrow down on a specific kernel build.
Once the specific kernel has been identified, there are several ways to download and install it.
== Download using the browser and install
One way is to download the identified packages using the browser and installing them.
Download the following package rpms for a specific kernel version into a directory
(best to create a new directory and just have the downloaded rpms in it.:
----
kernel-<version>.<release>.<arch>.rpm
kernel-core-<version>.<release>.<arch>.rpm
kernel-modules-<version>.<release>.<arch>.rpm
----
then, open a command prompt and change to this directory.
Execute the command to install the kernel:
----
sudo dnf install *
----
== Download and install a kernel using the koji client
=== Install the koji client
The koji client makes the process of installing a specific kernel much easier from the command line.
Use this command to install the client:
$ sudo dnf install koji
== Download and install the kernel
=== Download and install the kernel
Below is a one-line command that creates a new unique temporary directory, downloads kernel RPMs to it and installs them. This assumes we are working with the `x86_64` architecture.
Below is a one-line command that creates a new unique temporary directory,
downloads kernel RPMs to it and installs them.
This assumes we are working with the `x86_64` architecture.
cd $(mktemp -d) \
&& koji download-build --arch=x86_64 --arch=noarch kernel-n.nn.nn-nnn.fcnn \
@ -20,9 +53,10 @@ Below is a one-line command that creates a new unique temporary directory, downl
This eliminates the need to clean up after installation and the risk of installing unwanted rpms accidentally.
The following part of the above command downloads the kernel and its dependencies for the given architecture and kernel version.
The following part of the above command downloads the kernel
and its dependencies for the given architecture and kernel version.
koji download-build --arch=[arch] kernel-n.nn.nn-nnn.fcnn
koji download-build --arch=[arch] kernel-<version>.<release>
where [arch] indicates the architecture i.e. `x86_64`