How to break root password in CentOS RHEL 8

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Hi Guys,

I have my CentOS virtual machine in my virtual box. But I forgot my root password. How can I change my root password?

May 11, 2020 in Linux Administration by akhtar
• 38,170 points
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1 answer to this question.

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Hi@akhtar,

  • Reboot the system and interrupt the boot loader sequence by pressing any key.

  • Move the cursor to the entry that needs to be booted.

  • Press e to edit the selected entry. Move the cursor to the kernel command line (the line that starts with linux, it looks like the below output.

  • Append rd.break options in the end of the kernel command line. This will break just before control is handed from the initramfs to the actual system.

  • Press Ctrl+x and reboot the system. At this point, a root shell will be presented, with the root file system for the actual system mounted read-only on /sysroot.

  • Remount /sysroot as read-write.

$ switch_root:/# mount -o remount,rw /sysroot
  • Switch into a chroot jail, where /sysroot is treated as the root of the file system tree.

switch_root:/# chroot /sysroot
sh-4.4# 
  • Set a new root password here.

# passwd root

  • Make sure that all unlabeled files (including /etc/shadow at this point) get relabeled during boot.

sh-4.2# touch /.autorelabel
  • Type exit twice. The first will exit the chroot jail, and the second will exit the initramfs debug shell.

Hope this will solve your task.

answered May 11, 2020 by MD
• 95,060 points

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