How to change Root's password using Systemrescue (LVM)?

Question

System administration

Good afternoon, Dear members of the forum)
"I am developing myself", let's say so)
Background. The case takes place on a dedicated server. Filled with Proxmox. Deployed a virtual machine.

The question is.

How to reset root password on CentOS 7 using SystemRescue? (the same VPS)

It does not allow mounting sda2, because it is LVM, incompatibility of file systems ..

Rummaging around on the Internet, I found a similar option ...


The result, let's say positive-negative)
Yes, I changed the password)
But it's not clear which one .. .) i.e. neither the new password nor the old one is suitable ..)

Answer 1

Use chroot to properly mount OS root when using rescue live cd

Answer 2

Always changed in this way
You mount the partition in read mode. Therefore, nothing is saved.
Another way is to mount in write mode and throw in an SSH key.
mount -o rw,remount

Answer 3

passwd -d root
-d, --delete delete the password for the given account