CentOS

Here is the update... Found that kernel re-installation didn't work because OVH custom kernel was running. I've recreated damaged grub.cfg using grub2-mkconfig -o /boot/grub2/grub.cfg , then booted using kernel before CentOS upgrade (3.10.0-514.21.1.el7.x86_64). That way managed to reinstall the lat...

It is: lrwxrwxrwx 1 root root 22 Oct 15 08:22 grub2.cfg -> ../boot/grub2/grub.cfg /var/log/grubby reports: DBG: Image entry failed: uuid missing: rootdev (null), dev 67289254-847b-4654-804d-6c3a644b56d0 DBG: menuentry 'CentOS Linux (3.10.0-693.2.2.el7.x86_64) 7 (Core)' --class centos --class gnu-lin...

/boot/grub2/grub.cfg exists, but found that it is damaged, some text is missing at the end.

I copied it from backup, but yum reinstall kernel reports the same thing.

Should I copy from backup the whole /boot or some part of /etc?

Many thanks for your prompt reply Trevor! I've tried the following, but got "grubby fatal error: unable to find a suitable template" error: # yum list installed | grep kernel kernel.x86_64 3.10.0-514.6.1.el7 @updates kernel.x86_64 3.10.0-514.10.2.el7 @updates kernel.x86_64 3.10.0-514.16.1.el7 @updat...

Hi, I was upgrading CentOS 7.3 to CentOS 7.4 and the system crashed during updating package "microcode_ctl-2.1-22.el7.x86_64". Just suddenly got "Connection closed by foreign host": Running transaction Updating : libgcc-4.8.5-16.el7.x86_64 1/680 Installing : 1:grub2-common-2.02-0.64.el7.centos.noarc...