Booting

JetStream Версія unspecified Last review: 2021-10-11

Setting an installed kernel to boot by default

To set a specific installed kernel to boot by default, first check the kernels installed on the system.

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