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= Installing kernel from Koji
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:description: A quick guide on installing a kernel from the Koji repository.
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2022-01-08 03:49:47 +00:00
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Koji is the build system Fedora developers use to build software for inclusion into Fedora.
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If there is a need to install a kernel that is not currently available in the Fedora repositories,
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these can be obtained from the Koji repository.
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2022-01-08 03:49:47 +00:00
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== Check Koji (Fedora build system) for archived builds
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2022-01-08 03:49:47 +00:00
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Check the https://koji.fedoraproject.org/koji/search?match=glob&type=build&terms=kernel-*[Koji] archive for the historical builds.
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It is possible to use different searches or expressions to help narrow down on a specific kernel build.
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Once the specific kernel has been identified, there are several ways to download and install it.
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== Download using the browser and install
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One way is to download the identified packages using the browser and installing them.
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Download the following package rpms for a specific kernel version into a directory
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(best to create a new directory and just have the downloaded rpms in it.:
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----
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kernel-<version>.<release>.<arch>.rpm
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kernel-core-<version>.<release>.<arch>.rpm
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kernel-modules-<version>.<release>.<arch>.rpm
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----
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then, open a command prompt and change to this directory.
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Execute the command to install the kernel:
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----
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sudo dnf install *
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----
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== Download and install a kernel using the koji client
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=== Install the koji client
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The koji client makes the process of installing a specific kernel much easier from the command line.
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Use this command to install the client:
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$ sudo dnf install koji
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2022-01-08 03:49:47 +00:00
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=== Download and install the kernel
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2022-01-08 03:49:47 +00:00
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Below is a one-line command that creates a new unique temporary directory,
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downloads kernel RPMs to it and installs them.
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This assumes we are working with the `x86_64` architecture.
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cd $(mktemp -d) \
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&& koji download-build --arch=x86_64 --arch=noarch kernel-n.nn.nn-nnn.fcnn \
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&& sudo dnf install *
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This eliminates the need to clean up after installation and the risk of installing unwanted rpms accidentally.
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2022-01-08 03:49:47 +00:00
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The following part of the above command downloads the kernel
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and its dependencies for the given architecture and kernel version.
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2022-01-08 03:49:47 +00:00
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koji download-build --arch=[arch] kernel-<version>.<release>
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where [arch] indicates the architecture i.e. `x86_64`
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== Additional Steps:
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The following additional steps are often useful:
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* Set the default boot option - so this boots automatically subsequently
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See xref:kernel/booting.adoc[quick-doc on setting a specific kernel to boot by default]
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* Add a versionlock to ensure this version is not deleted when kernel updates are installed
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See xref:dnf.adoc#sect-using-dnf-plugin[quick-doc on using the dnf versionlock plugin]
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[[sect-references]]
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== References
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. https://fedoramagazine.org/install-kernel-koji/#comment-472889[Fedora Magazine article: How to install a kernel from koji]
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