quick-docs/modules/ROOT/pages/kernel/installing-koji-kernel.adoc

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= Installing kernel from Koji
:description: A quick guide on installing a kernel from the Koji repository.
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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.
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== Check Koji (Fedora build system) for archived builds
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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:
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sudo dnf install *
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== 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
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=== Download and install the kernel
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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 \
&& sudo dnf install *
This eliminates the need to clean up after installation and the risk of installing unwanted rpms accidentally.
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The following part of the above command downloads the kernel
and its dependencies for the given architecture and kernel version.
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koji download-build --arch=[arch] kernel-<version>.<release>
where [arch] indicates the architecture i.e. `x86_64`
== Additional Steps:
The following additional steps are often useful:
* Set the default boot option - so this boots automatically subsequently
See xref:kernel/booting.adoc[quick-doc on setting a specific kernel to boot by default]
* Add a versionlock to ensure this version is not deleted when kernel updates are installed
See xref:dnf.adoc#sect-using-dnf-plugin[quick-doc on using the dnf versionlock plugin]
[[sect-references]]
== References
. https://fedoramagazine.org/install-kernel-koji/#comment-472889[Fedora Magazine article: How to install a kernel from koji]