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Exam EX200 topic 1 question 62 discussion

Actual exam question from RedHat's EX200

Question #: 62
Topic #: 1

SIMULATION -
You are new System Administrator and from now you are going to handle the system and your main task is Network monitoring, Backup and Restore. But you don't know the root password. Change the root password to redhat and login in default Runlevel.

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Suggested Answer: See explanation below.
When you Boot the System, it starts on default Runlevel specified in /etc/inittab:
Id:?:initdefault:
When System Successfully boot, it will ask for username and password. But you don't know the root's password. To change the root password you need to boot the system into single user mode. You can pass the kernel arguments from the boot loader.
1. Restart the System.
2. You will get the boot loader GRUB screen.
3. Press a and type 1 or s for single mode ro root=LABEL=/ rhgb queit s
4. System will boot on Single User mode.
5. Use passwd command to change.
6. Press ctrl+d

by adolfoale at Jan. 17, 2021, 5:40 a.m.

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adolfoale

Highly Voted 3 years, 8 months ago

In RHEL8 - reboot the system - press "e" letter - Add "rd.break" at the end of de line thet begening with "Linux" in grub menu - ctrl + x - # mount -o remount,rw /sysroot - # chroot /sysroot - # passwd - # touch /.autorelabel - # exit - # logout

upvoted 28 times

urWaifu

2 years ago

Know this by heart, because you won't be able to log in on the second server during the exam.

upvoted 3 times

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MisterR0B0T

Most Recent 1 month ago

# Restart the System. # When the boot-loader menu appears, press any key to interrupt the countdown, except Enter. # - press "e" letter to edit # - Remove any console= options from the line. # 1 Add init=/bin/bash ...at the end of the line that begins with "Linux" in grub menu(ctrl e) # 2 crtl x ----bash-5.1#. # 3 mount -o remount,rw / # 4 ls -lZ /etc/shadow (note this dir system_u:object...) # 5 passwd redhat redhat # 6 chcon system_u:object... /etc/shadow # 7 exec /sbin/init

upvoted 1 times

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ly01

3 months ago

You can also do: interrupt boot and add init=/bin/bash as kernel argument mount -o remount,rw / whoami passwd touch /.autorelabel exec /lib/systemd/systemd

upvoted 2 times

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syed2020

2 years, 2 months ago

In RHEL 9 - Reboot the system - Press 'e' and modify line starting with Linux with rw and add init=/bin/bash - Press F10 - Enter passwd to reset root passwrod - touch /autorelable - exec /sbin/init

upvoted 2 times

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STFN2019

3 years ago

You can also do the following (slight variation to adolfoale's solution): - Reboot - At GRUB2 press e for the primary (default) kernel - Replace ro with rw init=/sysroot/bin/sh - Ctrl+X - chroot /sysroot - passwd root - Enter the password - touch /.autorelabel - Exit - Reboot

upvoted 1 times

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Ares23

3 years, 4 months ago

the "touch /.autorelabel" is needed if SELinux is enabled/enforced !! if you don't create it password not be update

upvoted 4 times

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