Sysadmin Grub Help?

My local dev server upgraded fine. Just my OVH server is have an issue.

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Yea, the server is using NVMe. But I have no issue booting from the grub prompt.

 

Reverted to previous kernel. Doesn't work. Still grub command prompt.

 

Previous kernel didn't work.

Sorry, had to wait to reboot. Below is the output.

Code:

# cat /etc/default/grub
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=0
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302"
GRUB_DISABLE_RECOVERY="true"
#GRUB_HIDDEN_TIMEOUT=0
GRUB_TIMEOUT=2
GRUB_DISABLE_LINUX_UUID=true

 

Code:

# df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/md2       xfs       1.1T   42G  1.1T   4% /
devtmpfs       devtmpfs   63G     0   63G   0% /dev
tmpfs          tmpfs      63G     0   63G   0% /dev/shm
tmpfs          tmpfs      63G  8.8M   63G   1% /run
tmpfs          tmpfs      63G     0   63G   0% /sys/fs/cgroup
/dev/nvme0n1p1 vfat      510M  3.5M  507M   1% /boot/efi
tmpfs          tmpfs      13G     0   13G   0% /run/user/0

Code:

# grubby --info=ALL
index=0
kernel=/boot/vmlinuz-3.10.0-693.2.2.el7.x86_64
args="ro crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302 "
root=/dev/md2
initrd=/boot/initramfs-3.10.0-693.2.2.el7.x86_64.img
title=CentOS Linux (3.10.0-693.2.2.el7.x86_64) 7 (Core)
index=1
kernel=/boot/vmlinuz-3.10.0-514.26.2.el7.x86_64
args="ro crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302 "
root=/dev/md2
initrd=/boot/initramfs-3.10.0-514.26.2.el7.x86_64.img
title=CentOS Linux (3.10.0-514.26.2.el7.x86_64) 7 (Core)
index=2
kernel=/boot/vmlinuz-3.10.0-514.26.1.el7.x86_64
args="ro crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302 "
root=/dev/md2
initrd=/boot/initramfs-3.10.0-514.26.1.el7.x86_64.img
title=CentOS Linux (3.10.0-514.26.1.el7.x86_64) 7 (Core)
index=3
kernel=/boot/vmlinuz-3.10.0-514.21.2.el7.x86_64
args="ro crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302 "
root=/dev/md2
initrd=/boot/initramfs-3.10.0-514.21.2.el7.x86_64.img
title=CentOS Linux (3.10.0-514.21.2.el7.x86_64) 7 (Core)
index=4
kernel=/boot/vmlinuz-3.10.0-514.21.1.el7.x86_64
args="ro crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302 "
root=/dev/md2
initrd=/boot/initramfs-3.10.0-514.21.1.el7.x86_64.img
title=CentOS Linux (3.10.0-514.21.1.el7.x86_64) 7 (Core)
index=5
kernel=/boot/vmlinuz-0-rescue-1e98a4cc1263468b9f9a12e365316b95
args="ro crashkernel=auto rhgb quiet rd.md.uuid=a032e06f:8e62819e:a4d2adc2:26fd5302 "
root=/dev/md2
initrd=/boot/initramfs-0-rescue-1e98a4cc1263468b9f9a12e365316b95.img
title=CentOS Linux (0-rescue-1e98a4cc1263468b9f9a12e365316b95) 7 (Core)
index=6
non linux entry

 

Put in a support ticket with OVH. Maybe they can solve the issue.

I might get another server and setup the HD differently.

 

@eva2000 Looking around in my /etc/ folder I see that the grub2-efi.cfg symlink is broken. My testing server that symlink is fine. Wanted to .bak that file and create a new symlink. Question: if I mess this up will my system not be able to boot? Don't want to do anything that will prohibit me from getting into the system from the grub command prompt. Or do you think this file has nothing to do with the issue.

 

Also found this: grub2-install on UEFI make the machine unbootable - CentOS

Code:

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

 

Solution:

Code:

yum reinstall grub2-efi shim

Code:

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

The /boot/efi/EFI/centos/ folder lacked the grub.cfg file.

 

Found a couple threads about not booting and EFI and then compared my local server which is working and EFI to the online server. Not sure if I really needed to reinstall, but figured why not. Glad got this figured out.

Thanks for all your help!