Change grub2 default kernel
Change grub2 default kernel
0. Check if grub_default is setup to saved
# cat /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=cl/root vconsole.font=latarcyrheb-sun16 crashkernel=auto vconsole.keymap=us rd.lvm.lv=cl/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
1. make copy of grub
2. generata new grub .config
# grub2-mkconfig -o /boot/grub2/grub.cfg
3. Check what kernels are available.
# grep "^menuentry" /boot/grub2/grub.cfg | cut -d "'" -f2
4. Select kernel by name and setup as default
#grub2-set-default "Oracle Linux Server 7.9, with Linux 3.10.0-1160.31.1.el7.x86_64
5. Check what is saved entry
# grub2-editenv list
Comments
Post a Comment