I cloned my disk with zabbix server running on centos 8 and program used for cloning broke grub. Both disks cannot start, now on cloned disk I installed fresh system without removing old data ( I had a lot of unallocated space). Question is: how I can switch records in grub(or anywhere I need) to start old Centos ?
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You should start CentOS with emergency/recovery mode and from there, check what was used to boot and edit the grub.conf file using it as example.
https://computingforgeeks.com/booting-centos-rhel-into-emergency-mode-recovery-mode/
You will need the CentOS 8 ISO to boot and then remount the drives:
# mount -o remount,rw /
Tomas
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