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Merge #396 Installing Koji kernel. Booting specific kernel by default.
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** xref:upgrading-fedora-online.adoc[Upgrading Fedora using package manager]
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* xref:kernel/overview.adoc[Kernel and booting]
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** xref:kernel/booting.adoc[Booting]
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** xref:kernel/troubleshooting.adoc[Troubleshooting]
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** xref:kernel/build-custom-kernel.adoc[Building a Custom Kernel]
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** xref:kernel/howto-kernel-testday.adoc[Guide for Kernel Test Days]
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** xref:debug-dracut-problems.adoc[How to debug Dracut problems]
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** xref:kernel/installing-koji-kernel.adoc[Installing a kernel from Koji]
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* Virtualization
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** xref:getting-started-with-virtualization.adoc[Getting started with virtualization (libvirt)]
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[[booting_specific_kernel_default]]
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== Setting an installed kernel to boot by default
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To set a specific installed kernel to boot by default, first check the kernels installed on the system.
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----
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sudo ls /boot | grep vmlinuz
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----
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Identify the kernel to be set to boot by default.
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Use the following command to set the default kernel to boot:
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----
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sudo grubby --set-default /boot/vmlinuz-<version>.<release>.<arch>
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----
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Here is a sample output (on an `x84_64` architecture system):
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----
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sudo ls /boot | grep vmlinuz
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vmlinuz-0-rescue-c722f5f7d614446b99c39b846c2bb76c
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vmlinuz-5.12.18-200.fc33.x86_64
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vmlinuz-5.8.15-301.fc33.x86_64
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----
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If `vmlinuz-<version>.<release>.<arch>` is chosen to be set as the default, we issue the following command:
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----
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sudo grubby --set-default /boot/vmlinuz-<version>.<release>.<arch>
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----
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For the above scenario, the command will look like so
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----
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sudo grubby --set-default /boot/vmlinuz-5.12.18-200.fc33.x86_64
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----
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[[sect-references]]
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=== References:
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* 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]
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@ -112,6 +112,7 @@ If you have used this configuration, you can disable it in individual DNF comman
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If you use a GUI update application which does not allow you to specify packages to exclude when they run, this method can be used.
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[[sect-using-dnf-plugin]]
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=== Using the DNF Versionlock plugin
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You can also use the DNF `versionlock` plugin to limit the packages that are included in a transaction.
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4
modules/ROOT/pages/kernel/booting.adoc
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4
modules/ROOT/pages/kernel/booting.adoc
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Booting
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=======
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include::{partialsdir}/proc_booting-specific-kernel-default.adoc[]
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modules/ROOT/pages/kernel/installing-koji-kernel.adoc
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79
modules/ROOT/pages/kernel/installing-koji-kernel.adoc
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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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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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== 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.
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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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=== Download and install the kernel
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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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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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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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