How to modify the root password when you forget the root password of centos.

Note: This method can only be performed on the console, but not remotely.

The premise of entering the single-user mode is that the system boot loader works properly. The following uses GRUB as an example to describe the access method. There are three operation buttons "A", "E", and "C" in the grub boot menu. You can use these buttons to enter the single-user mode.

 

Method 1 use the "A" button to enter single-user mode ------ recommended: simple operation

This is the fastest way to enter the single-user mode. InUse the "A" operation button in the grub Startup menu to edit the Kernel Parameter and enter single at the end of the line to inform the Linux kernel that the subsequent startup process needs to enter single user mode. Press enter..