OL8 Kernel 변경

[root@node1 ~]# grubby --info=ALL
index=0
kernel="/boot/vmlinuz-5.15.0-101.103.2.1.el8uek.x86_64"
args="ro resume=/dev/mapper/ol-swap rd.lvm.lv=ol/root rd.lvm.lv=ol/swap rhgb quiet numa=off transparent_hugepage=never $tuned_params"
root="/dev/mapper/ol-root"
initrd="/boot/initramfs-5.15.0-101.103.2.1.el8uek.x86_64.img $tuned_initrd"
title="Oracle Linux Server 8 (5.15.0-101.103.2.1.el8uek.x86_64) "
id="2ece60edbd5f41bebc450eaaacea37fc-5.15.0-101.103.2.1.el8uek.x86_64"
index=1
kernel="/boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64"
args="ro resume=/dev/mapper/ol-swap rd.lvm.lv=ol/root rd.lvm.lv=ol/swap rhgb quiet numa=off transparent_hugepage=never $tuned_params"
root="/dev/mapper/ol-root"
initrd="/boot/initramfs-4.18.0-477.10.1.el8_8.x86_64.img $tuned_initrd"
title="Oracle Linux Server (4.18.0-477.10.1.el8_8.x86_64) 8.8"
id="2ece60edbd5f41bebc450eaaacea37fc-4.18.0-477.10.1.el8_8.x86_64"
index=2
kernel="/boot/vmlinuz-0-rescue-2ece60edbd5f41bebc450eaaacea37fc"
args="ro resume=/dev/mapper/ol-swap rd.lvm.lv=ol/root rd.lvm.lv=ol/swap rhgb quiet numa=off transparent_hugepage=never $tuned_params"
root="/dev/mapper/ol-root"
initrd="/boot/initramfs-0-rescue-2ece60edbd5f41bebc450eaaacea37fc.img $tuned_initrd"
title="Oracle Linux Server 8 (0-rescue-2ece60edbd5f41bebc450eaaacea37fc) "
id="2ece60edbd5f41bebc450eaaacea37fc-0-rescue"

[root@node1 ~]# grubby --default-kernel
/boot/vmlinuz-5.15.0-101.103.2.1.el8uek.x86_64

[root@node1 ~]# grubby --set-default /boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64
The default is /boot/loader/entries/2ece60edbd5f41bebc450eaaacea37fc-4.18.0-477.10.1.el8_8.x86_64.conf with index 1 and kernel /boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64

[root@node1 ~]# grubby --default-kernel
/boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64