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Exam (elaborations)

RHCSA Exam Study Guide with Complete Solutions

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  • Module
  • RHCSA
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  • RHCSA

RHCSA Exam Study Guide with Complete Solutions commands/process to reset root password - Answer️️ -on boot: select most recent kernel `e` to edit goto line with linux16, add `` to end of line `ctrl+x` to continue boot to rd rescue mode remount /sysroot as readable (defaults to read only i...

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  • August 28, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • RHCSA
  • RHCSA
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©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

RHCSA Exam Study Guide with Complete Solutions

commands/process to reset root password - Answer✔️✔️-on boot:

select most recent kernel

`e` to edit

goto line with linux16, add `rd.break` to end of line

`ctrl+x` to continue boot to rd rescue mode

remount /sysroot as readable (defaults to read only in rd rescue mode):

`mount -o remount,rw /sysroot`

load the target env with:

`chroot /sysroot`

reset the password with:

`passwd root`

fix selinux context with (instructs selinux to perform full relabel on next
reboot):

`touch /.autorelabel`

fix bootloader config issues

(kernel not found or similar error) - Answer✔️✔️-edit boot config

confirm boot config is correct and make changes (spelling errors, etc)




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,©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

add `systemd.unit=rescue.target` to the end of the linux16 line

regenerate grub config with the following command:

`grub2-mkconfig -o /boot/grub2/grub.cfg`

To diagnose boot issues more easily, you decide to disable 'quiet boot' and
'graphical boot' by removing 'quiet' and 'rhgb' from the kernel boot
parameters. How would you accomplish this so it's persistent? -
Answer✔️✔️-Edit the 'GRUB_CMDLINE_LINUX' line in
'/etc/default/grub' then regenerate the bootloader config using 'grub2-
mkconfig -o /boot/grub2/grub.cfg'.

Under normal circumstances, what is systemd's PID (Process ID)? -
Answer✔️✔️-PID 1 - because it's the very first binary called by the kernel at
boot, and is responsible for starting up all other processes.

Which rescue parameter would you pass to the kernel from the grub2
menu if your system was failing to boot because a filesystem check was
failing? - Answer✔️✔️-systemd.unit=emergency.target



Booting to the emergency target state drops to a rescue shell after the 'root'
filesystem has been mounted readonly, but BEFORE other FS checks are
carried out. Although you could do the same with 'rd.break' it would
require considerably more effort.

You are a member of a team of admins who are responsible for a critical
system. This system has two different web servers installed: The first



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, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

(Nginx) is used to serve content, the other (httpd) is installed only to satisfy
dependencies and should never be started as it causes a conflict. What
command could you run to ensure that 'httpd' is never accidentally started
or enabled by another admin? - Answer✔️✔️-systemctl mask httpd

You're having a bad day and accidentally delete the 'initramfs' file in /boot
that matches your current kernel. Which command would you run to
recover from this? - Answer✔️✔️-dracut

You've just made a configuration change to the 'SSHD' service and want to
daemon to reload it's configuration without disconnecting anyone. How
could you accomplish this? - Answer✔️✔️-systemctl reload sshd.service

persistent hostname change with systemd - Answer✔️✔️-hostnamectl set-
hostname your.host.name

command to show open/listening ports - Answer✔️✔️-ss -taupen



t = tcp

a = all types of connections (sending as well as listening)

u = udp

p = process ids (and information about the processes that are holding those
ports

e = extra information

n = numbers only (don't resolve the hostnames)


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