How to reset RHEL7 or CentOS7 system password

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

RHEL7 / CentOS7 / Scientific Linux 7

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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.

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

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.

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

switch_root:/# chroot /sysroot 

The command line prompt will change slightly.

sh-4.2# passwd 

sh-4.2# load_policy -i 

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 and log in with the new root password.

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