flrichar/grubby-options.md

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Grubby options, for rhel or centos

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grubby-options.md

Grubby Options

Use Grubby to add or remove kernel parameters, and select the default kernel to boot into. Note, this is for primarily OpenSUSE and RHEL-like distros, Alma, Rocky etc.

disable selinux: sudo grubby --update-kernel=ALL --args="selinux=0"
list all kernels: sudo grubby --info ALL
default kernel by name: sudo grubby --default-kernel, set default-kernel: sudo grubby --set-default-kernel="/boot/vmlinuz-xxxxxx"
default kernel by index: sudo grubby --default-index, set default-index: sudo grubby --set-default-index=2

CGroups Kernel Parameters

default cgroup version (legacy = v1, unified = v2) ... systemctl --version | awk '{print $NF}'
remove cgroups v2 from kernel parameters: sudo grubby --update-kernel=$(sudo grubby --default-kernel) --remove-args="systemd.unified_cgroup_hierarchy=1"
force cgroups v1 in kernel parameters: sudo grubby --update-kernel=$(sudo grubby --default-kernel) --args="systemd.unified_cgroup_hierarchy=0"

For Ubuntu & Debian

sudo vi /etc/default/grub ... modify systemd.unified_cgroup_hierarchy=1 or zero, as needed
sudo update-grub & reboot

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