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Old 05-28-2018, 12:11 AM   #1
Honest Abe
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Registered: May 2018
Distribution: CentOS 7, OpenSUSE 15
Posts: 420
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Dual boot : os-prober does not recognize updated CentOS kernel

Hi LQ,

Since the good folks at OpenSUSE released the latest version 15, I decided to upgrade my buggy version of Leap 42.2. The upgrade was done via a live USB and not by usual 'zypper dup'

This is my oldest laptop, which housed CentOS 7.4 and Leap 42.2 as dual boot setup. Opensuse was (& is) in charge of handling the Grub2 bootloader menu.

After the new OpenSUSE was installed, it detected my CentOS installation as it should and added entry to bootloader. Then, I decided to do a kernel upgrade on CentOS from 3.10.0-693.17.1.el7.x86_64 to 3.10.0-862.3.2.el7. I still wanted opensuse to handle the grub2 menu. So I completed the kernel update on CentOS, rebooted and logged into OpenSUSE and ran 'os-prober'.

Output -
Code:
acer-SUSE:~ # os-prober
/dev/mapper/VG_Cent7_R-root:CentOS Linux 7 (Core):CentOS:linux
So, now, I can log into the older kernel version of CentOS and not to the newer kernel. Could you please tell what I am doing wrong ?

I have looked at dedoimedo's tutorial along with others on the LQ forum. I am sure this question has been asked previously (and answered), but it's challenging to find a needle in a haystack when 70% of the threads talk about dual booting with windows and legacy grub. If you could point me to a helpful thread, that'd be very much appreciated.

CentOS current and installed kernel -

Code:
-bash-4.2$ sudo yum list installed kernel
[sudo] password for anirban: 
~truncated~
Installed Packages
kernel.x86_64                    3.10.0-693.5.2.el7                     @updates
kernel.x86_64                    3.10.0-693.11.1.el7                    @updates
kernel.x86_64                    3.10.0-693.11.6.el7                    @updates
kernel.x86_64                    3.10.0-693.17.1.el7                    @updates
kernel.x86_64                    3.10.0-862.3.2.el7                     @updates
-bash-4.2$ uname -a
Linux ab-CentOS7.example.com 3.10.0-693.17.1.el7.x86_64 #1 SMP Thu Jan 25 20:13:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
grub2 of CentOS. New kernel has been detected.
Code:
-bash-4.2$ sudo cat /boot/grub2/grub.cfg | grep -Ev "^#|^$"
set pager=1
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi
function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}
function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}
terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
else
  set timeout=5
fi
set tuned_params=""
if [ -f ${prefix}/user.cfg ]; then
  source ${prefix}/user.cfg
  if [ -n "${GRUB2_PASSWORD}" ]; then
    set superusers="root"
    export superusers
    password_pbkdf2 root ${GRUB2_PASSWORD}
  fi
fi
menuentry 'CentOS Linux (3.10.0-862.3.2.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.el7.x86_64-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 --hint='hd0,msdos1'  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux16 /vmlinuz-3.10.0-862.3.2.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd16 /initramfs-3.10.0-862.3.2.el7.x86_64.img
}
menuentry 'CentOS Linux (3.10.0-693.17.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.el7.x86_64-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 --hint='hd0,msdos1'  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux16 /vmlinuz-3.10.0-693.17.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd16 /initramfs-3.10.0-693.17.1.el7.x86_64.img
}
menuentry 'CentOS Linux (3.10.0-693.11.6.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.el7.x86_64-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 --hint='hd0,msdos1'  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux16 /vmlinuz-3.10.0-693.11.6.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd16 /initramfs-3.10.0-693.11.6.el7.x86_64.img
}
menuentry 'CentOS Linux (3.10.0-693.11.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.el7.x86_64-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 --hint='hd0,msdos1'  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux16 /vmlinuz-3.10.0-693.11.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd16 /initramfs-3.10.0-693.11.1.el7.x86_64.img
}
menuentry 'CentOS Linux (3.10.0-693.5.2.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.el7.x86_64-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 --hint='hd0,msdos1'  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux16 /vmlinuz-3.10.0-693.5.2.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd16 /initramfs-3.10.0-693.5.2.el7.x86_64.img
}
menuentry 'CentOS Linux (0-rescue-8a2d310914e84a238d8cac8c1455c823) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-8a2d310914e84a238d8cac8c1455c823-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	load_video
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 --hint='hd0,msdos1'  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux16 /vmlinuz-0-rescue-8a2d310914e84a238d8cac8c1455c823 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet
	initrd16 /initramfs-0-rescue-8a2d310914e84a238d8cac8c1455c823.img
}
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
Grub2 of OpenSUSE -

Code:
acer-SUSE:~ # grep -Ev "^$|^#" /boot/grub2/grub.cfg
if [ -f ${config_directory}/grubenv ]; then
  load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${env_block}" ] ; then
  load_env -f "${env_block}"
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   if [ "${env_block}" ] ; then
     save_env -f "${env_block}" next_entry
   fi
   set boot_once=true
else
   set default="${saved_entry}"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi
function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
    if [ "${env_block}" ] ; then
      save_env -f "${env_block}" saved_entry
    fi
  fi
}
function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}
if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod lvm
insmod xfs
set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
else
  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
fi
    font="/usr/share/grub2/unicode.pf2"
fi
if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod lvm
insmod xfs
set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
else
  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
fi
insmod gfxmenu
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans-Bold14.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans10.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans12.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/ascii.pf2
insmod png
set theme=($root)/boot/grub2/themes/openSUSE/theme.txt
export theme
if [ x${boot_once} = xtrue ]; then
  set timeout=0
elif [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=8
else
  set timeout=8
fi
set tuned_params=""
set tuned_initrd=""
menuentry 'openSUSE Leap 15.0'  --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-6251e56e-3b65-4610-9ebe-38dfbe456008' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod lvm
	insmod xfs
	set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
	else
	  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
	fi
	echo	'Loading Linux 4.12.14-lp150.12.4-default ...'
	linux	/boot/vmlinuz-4.12.14-lp150.12.4-default root=/dev/mapper/leap_rootvg-leap_rootlv  quiet install=hd:/// resume=/dev/disk/by-uuid/757537df-8a6d-4001-84c6-d302e4d5926a splash=silent quiet showopts
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd-4.12.14-lp150.12.4-default
}
submenu 'Advanced options for openSUSE Leap 15.0' --hotkey=1 $menuentry_id_option 'gnulinux-advanced-6251e56e-3b65-4610-9ebe-38dfbe456008' {
	menuentry 'openSUSE Leap 15.0, with Linux 4.12.14-lp150.12.4-default' --hotkey=2 --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.12.14-lp150.12.4-default-advanced-6251e56e-3b65-4610-9ebe-38dfbe456008' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod lvm
		insmod xfs
		set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
		else
		  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
		fi
		echo	'Loading Linux 4.12.14-lp150.12.4-default ...'
		linux	/boot/vmlinuz-4.12.14-lp150.12.4-default root=/dev/mapper/leap_rootvg-leap_rootlv  quiet install=hd:/// resume=/dev/disk/by-uuid/757537df-8a6d-4001-84c6-d302e4d5926a splash=silent quiet showopts
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd-4.12.14-lp150.12.4-default
	}
	menuentry 'openSUSE Leap 15.0, with Linux 4.12.14-lp150.12.4-default (recovery mode)' --hotkey=3 --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.12.14-lp150.12.4-default-recovery-6251e56e-3b65-4610-9ebe-38dfbe456008' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod lvm
		insmod xfs
		set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
		else
		  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
		fi
		echo	'Loading Linux 4.12.14-lp150.12.4-default ...'
		linux	/boot/vmlinuz-4.12.14-lp150.12.4-default root=/dev/mapper/leap_rootvg-leap_rootlv  
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd-4.12.14-lp150.12.4-default
	}
}
menuentry 'CentOS Linux 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class centos --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux /vmlinuz-3.10.0-693.17.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd /initramfs-3.10.0-693.17.1.el7.x86_64.img
}
submenu 'Advanced options for CentOS Linux 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' $menuentry_id_option 'osprober-gnulinux-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	menuentry 'CentOS Linux (3.10.0-693.17.1.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.17.1.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.17.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.17.1.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.11.6.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.11.6.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.11.6.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.11.6.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.11.1.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.11.1.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.11.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.11.1.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.5.2.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.5.2.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.5.2.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.5.2.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-514.21.1.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-514.21.1.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-514.21.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-514.21.1.el7.x86_64.img
	}
	menuentry 'CentOS Linux (0-rescue-8a2d310914e84a238d8cac8c1455c823) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-0-rescue-8a2d310914e84a238d8cac8c1455c823--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-0-rescue-8a2d310914e84a238d8cac8c1455c823 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet
		initrd /initramfs-0-rescue-8a2d310914e84a238d8cac8c1455c823.img
	}
}
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
Do I need to edit the grub2.cfg of opensuse manually and just add the entry for 3.10.0-862.3.2.el7.x86_64 ?
 
Old 05-28-2018, 01:54 AM   #2
Honest Abe
Member
 
Registered: May 2018
Distribution: CentOS 7, OpenSUSE 15
Posts: 420

Original Poster
Blog Entries: 1

Rep: Reputation: 202Reputation: 202Reputation: 202
Talking Sorted
Here's what I did on OpenSUSE -

1. Took a backup of /boot/grub2/grub.cfg
Code:
# cp -p /boot/grub2/grub.cfg /var/tmp/
2. I was actually seeking guidance on this step.. but went ahead anyway. (had my live USB ready)
Code:
# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found theme: /boot/grub2/themes/openSUSE/theme.txt
Found linux image: /boot/vmlinuz-4.12.14-lp150.12.4-default
Found initrd image: /boot/initrd-4.12.14-lp150.12.4-default
Found CentOS Linux 7 (Core) on /dev/mapper/VG_Cent7_R-root
done
3. Here's my grub.cfg after. Observe that it has detected the newer kernel on the CentOS.

Code:
# cat /boot/grub2/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -f ${config_directory}/grubenv ]; then
  load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
  load_env
fi

if [ "${env_block}" ] ; then
  load_env -f "${env_block}"
fi

if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   if [ "${env_block}" ] ; then
     save_env -f "${env_block}" next_entry
   fi
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
    if [ "${env_block}" ] ; then
      save_env -f "${env_block}" saved_entry
    fi

  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod lvm
insmod xfs
set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
else
  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
fi
    font="/usr/share/grub2/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=POSIX
  insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod lvm
insmod xfs
set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
else
  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
fi
insmod gfxmenu
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans-Bold14.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans10.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans12.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/ascii.pf2
insmod png
set theme=($root)/boot/grub2/themes/openSUSE/theme.txt
export theme
if [ x${boot_once} = xtrue ]; then
  set timeout=0
elif [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=8
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=8
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/00_tuned ###
set tuned_params=""
set tuned_initrd=""
### END /etc/grub.d/00_tuned ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'openSUSE Leap 15.0'  --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-6251e56e-3b65-4610-9ebe-38dfbe456008' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod lvm
	insmod xfs
	set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
	else
	  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
	fi
	echo	'Loading Linux 4.12.14-lp150.12.4-default ...'
	linux	/boot/vmlinuz-4.12.14-lp150.12.4-default root=/dev/mapper/leap_rootvg-leap_rootlv  quiet install=hd:/// resume=/dev/disk/by-uuid/757537df-8a6d-4001-84c6-d302e4d5926a splash=silent quiet showopts
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd-4.12.14-lp150.12.4-default
}
submenu 'Advanced options for openSUSE Leap 15.0' --hotkey=1 $menuentry_id_option 'gnulinux-advanced-6251e56e-3b65-4610-9ebe-38dfbe456008' {
	menuentry 'openSUSE Leap 15.0, with Linux 4.12.14-lp150.12.4-default' --hotkey=2 --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.12.14-lp150.12.4-default-advanced-6251e56e-3b65-4610-9ebe-38dfbe456008' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod lvm
		insmod xfs
		set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
		else
		  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
		fi
		echo	'Loading Linux 4.12.14-lp150.12.4-default ...'
		linux	/boot/vmlinuz-4.12.14-lp150.12.4-default root=/dev/mapper/leap_rootvg-leap_rootlv  quiet install=hd:/// resume=/dev/disk/by-uuid/757537df-8a6d-4001-84c6-d302e4d5926a splash=silent quiet showopts
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd-4.12.14-lp150.12.4-default
	}
	menuentry 'openSUSE Leap 15.0, with Linux 4.12.14-lp150.12.4-default (recovery mode)' --hotkey=3 --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.12.14-lp150.12.4-default-recovery-6251e56e-3b65-4610-9ebe-38dfbe456008' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod lvm
		insmod xfs
		set root='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint='lvmid/Vd2WFw-yf3M-IHEy-NTBq-Fm9a-Y7y0-UKGiXe/jM3PvY-64bG-oc1X-kfYe-hg4f-eVbd-gv2Fnf'  6251e56e-3b65-4610-9ebe-38dfbe456008
		else
		  search --no-floppy --fs-uuid --set=root 6251e56e-3b65-4610-9ebe-38dfbe456008
		fi
		echo	'Loading Linux 4.12.14-lp150.12.4-default ...'
		linux	/boot/vmlinuz-4.12.14-lp150.12.4-default root=/dev/mapper/leap_rootvg-leap_rootlv  
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd-4.12.14-lp150.12.4-default
	}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'CentOS Linux 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class centos --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
	else
	  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
	fi
	linux /vmlinuz-3.10.0-862.3.2.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
	initrd /initramfs-3.10.0-862.3.2.el7.x86_64.img
}
submenu 'Advanced options for CentOS Linux 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' $menuentry_id_option 'osprober-gnulinux-advanced-0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
	menuentry 'CentOS Linux (3.10.0-862.3.2.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-862.3.2.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-862.3.2.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-862.3.2.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.17.1.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.17.1.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.17.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.17.1.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.11.6.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.11.6.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.11.6.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.11.6.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.11.1.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.11.1.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.11.1.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.11.1.el7.x86_64.img
	}
	menuentry 'CentOS Linux (3.10.0-693.5.2.el7.x86_64) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-3.10.0-693.5.2.el7.x86_64--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-3.10.0-693.5.2.el7.x86_64 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet LANG=en_US.UTF-8
		initrd /initramfs-3.10.0-693.5.2.el7.x86_64.img
	}
	menuentry 'CentOS Linux (0-rescue-8a2d310914e84a238d8cac8c1455c823) 7 (Core) (on /dev/mapper/VG_Cent7_R-root)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/vmlinuz-0-rescue-8a2d310914e84a238d8cac8c1455c823--0b9b8df8-01ae-468d-a6e8-5c1a696c8755' {
		insmod part_msdos
		insmod xfs
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  22675616-84e7-40a4-bcf9-9c7627f11825
		else
		  search --no-floppy --fs-uuid --set=root 22675616-84e7-40a4-bcf9-9c7627f11825
		fi
		linux /vmlinuz-0-rescue-8a2d310914e84a238d8cac8c1455c823 root=/dev/mapper/VG_Cent7_R-root ro rd.lvm.lv=VG_Cent7_R/root rhgb quiet
		initrd /initramfs-0-rescue-8a2d310914e84a238d8cac8c1455c823.img
	}
}

### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

### BEGIN /etc/grub.d/80_suse_btrfs_snapshot ###
### END /etc/grub.d/80_suse_btrfs_snapshot ###

### BEGIN /etc/grub.d/90_persistent ###
### END /etc/grub.d/90_persistent ###

### BEGIN /etc/grub.d/95_textmode ###
### END /etc/grub.d/95_textmode ###
Rebooted and the default CentOS entry logged me in to the updated kernel correctly. That's all I wanted !

Now I am feeling kinda silly to have asked this question without attempting it in the first place. Maybe it'll help someone someday.
 
  


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