How to reset RHEL7 or CentOS7 system password

Introduction

The world of RHEL7 has changed, and so has the way to reset your root password. While the old method of interrupting the boot process (init=/bin/bash) still works, it is no longer recommended. "Systemd" uses "rd.break" to break boot. Let’s take a quick look at the entire process.

introduce Purpose

Reset the root password in RHEL7/CentOS7/Scientific Linux 7.

Require

RHEL7 / CentOS7 / Scientific Linux 7

Difficulty level

medium

guide

The world of RHEL7 has changed, and so has the way to reset your root password. While the old method of interrupting the boot process (init=/bin/bash) still works, it is no longer recommended. "Systemd" uses "rd.break" to break boot. Let’s take a quick look at the entire process.

Boot into minimal mode

Restart the system and press e on the kernel list page before the system starts. You will enter edit mode.

Interrupt startup process

In the kernel string - enter rd.break on the line ending with linux 16 /vmlinuz- ect. Then Ctrl X restart. The system boots into the initialized memory disk and is mounted at /sysroot. You do not need to enter a password in this mode.

Remount the file system for reading and writing

switch_root:/# mount -o remount,rw /sysroot/

Make /sysroot the root directory

switch_root:/# chroot /sysroot 

The command line prompt will change slightly.

Change root password

sh-4.2# passwd 

Load SELinux policy

sh-4.2# load_policy -i 

Set the context type in /etc/shadow

sh-4.2# chcon -t shadow_t /etc/shadow 

Note: You can skip the last two steps by creating the autorelabel file as follows, but automatically rebuilding the label will take a long time.

sh-4.2# touch /.autorelabel 

For this reason, despite it being simpler, it should be considered a "lazy person's choice" rather than a recommendation.

Exit and restart

Exit and restart and log in with the new root password.

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