RHCSA Exam Dump

RHCSA Exam Questions and Answer

Node-1

1. Networking
Modify the network connections Ip Address of node1 IP address: 172.25.250.10 netmask 255.255.255.0 Gateway: 172.25.250.254 DNS 172.25.250.220 Hostname: utility.net16.example.com

nmcli connection add con-name llc ifname eth0 type ethernet \
  ipv4.addresses 172.25.250.10/24 \
  ipv4.gateway 172.25.250.254 ipv4.dns 172.25.250.220 \
  ipv4.method manual
nmcli connection up
nmcli connection modify System eth0 connection.autoconnect no
nmcli connection show
reboot
ip addr show
hostnamectl set-hostname utility.net16.example.com
hostnamectl verify

2. Repository Creation
Configure AppStream and BaseOS local repositories.

cd /etc/yum.repos.d/
vim red.repo
# [repoid1]
# name = appstream
# enabled = 1
# gpgcheck = 0
# baseurl = http://content.example.com/rhel9.3/x86_64/dvd/AppStream

# [repoid2]
# name = baseOS
# enabled = 1
# gpgcheck = 0
# baseurl = http://content.example.com/rhel9.3/x86_64/dvd/BaseOS

:wq!
dnf clean all
dnf repolist all

3. Users and Groups Permission
Create stoogs group, add natasha and curly (stoogs as secondary for curly), larry has no shell/no stoogs. All user passwords: ranguski.

groupadd stoogs
useradd -G stoogs natasha
useradd -G stoogs curly
useradd -s /sbin/nologin larry
passwd natasha
passwd curly
passwd larry

4. Directory Creation
Create /home/manager (group stoogs), set permissions (rwx for group), set SGID bit.

mkdir -p /home/manager
chgrp stoogs /home/manager/
chmod 770 /home/manager/
chmod g+s /home/manager/

5. Cron Jobs
Natasha: cron job 14:23 daily, echo "redhat rhcsa"; Deny larry cron.

dnf install cronie -y
systemctl enable crond
systemctl start crond
su – natasha
crontab -e
# 23 14 * * * /bin/echo "redhat rhcsa"
logout
vim /etc/cron.deny   # add "larry"

6. NTP
chrony client, sync to utility.net16.example.com

dnf install chrony -y
systemctl enable chronyd
systemctl start chronyd
vim /etc/chrony.conf    # server utility.net16.example.com iburst
systemctl restart chronyd
timedatectl
chronyc sources -v

7. Archiving
Compress /etc/ folder using gzip, save under /opt

cd /opt
tar -czf etc.tar.gz /etc
ls

8. Add User
Create user dax with UID 4112

useradd -u 4112 dax

9. Locate User Files
Find all files by user natasha, copy to /root/found

mkdir /root/found
find / -user natasha -exec cp -rp {} /root/found \;

10. Search for Word
Find lines with "enter" from /usr/share/dict/words, copy to /root/word.found

grep "enter" /usr/share/dict/words >> /root/word.found
cat /root/word.found

11. NFS Automounting
Automount /ruser/remoteuser16 from utility.net16.example.com

dnf install autofs
systemctl --now enable autofs
vim /etc/auto.master.d/demo.autofs   # /ruser /etc/auto.nfs
vim /etc/auto.nfs                    # remoteuser16 -fstype=nfs,rw,sync utility.net16.example.com:/ruser/remoteuser16
systemctl restart autofs.service

12. SELinux Port Labelling
Allow http on port 83/tcp and enable service.

dnf install httpd
systemctl enable --now httpd
vim /etc/httpd/conf/httpd.conf   # Listen 83
semanage port -a -t http_port_t -p tcp 83
systemctl restart httpd
firewall-cmd –add-port=83/tcp --permanent
firewall-cmd --reload
curl http://hostname:83/

13. Persistent Storage Container
Create container-asci2pdf.service for wallah, volumes /opt/files and /opt/processed

mkdir /opt/files /opt/processed
chmod 777 /opt/files /opt/processed
chown wallah:wallah /opt/files /opt/processed
su - wallah
podman login registry.lab.example.com
podman pull registry.lab.example.com/rhel9/moniter
podman run –name ascii2pdf -v /opt/files:/opt/incoming:Z -v /opt/processed:/opt/outgoing:Z monitor
podman generate systemd --name ascii2pdf --files --new
systemctl --user daemon-reload
systemctl --user enable --now container-ascii2pdf

14. Umask for Denver
Denver gets read-only permission (umask 333)

id denver || useradd denver
su - denver
vim ~/.bash_profile   # Add: umask 333
source ~/.bash_profile
umask
logout

15. Scripting for Harry
Create script only for user harry, displays "RHCSA EXAM EX200"

id harry || useradd harry
su – harry
mkdir ~/bin
cd ~/bin
echo 'echo "RHCSA EXAM EX200"' > sample-llc
chmod +x ~/bin/sample-llc
./sample-llc

16. Scripting, Only Group Reva
Script /mnt/result.sh, group Reva only, displays result

vim /mnt/result.sh    # echo "I am very happy with EX200 result"
chmod g+x /mnt/result.sh
chgrp Reva /mnt/result.sh
ls -l /mnt/result.sh

17. Sudo Permission
Group elite gets passwordless sudo

groupadd elite  # If not existing
visudo          # Add: %elite ALL=(ALL) NOPASSWD: ALL

18. Password Policy
Password expires for new users after 20 days

vim /etc/login.defs   # PASS_MAX_DAYS = 20
chage -l <username>

---

Node-2

1. Break Root Password
Set root password to ratencot

reboot
# At GRUB boot, select rescue kernel, press 'e'
# Find 'linux' line, add: rd.break (remove console=... if present)
# Ctrl + x
mount -o remount,rw /sysroot
chroot /sysroot
passwd root   # set: ratencot
touch /.autorelabel
exit
exit

2. Repository Creation
(AppStream and BaseOS - same as Node-1, Q2; see above)

(Refer to Node-1, Question 2)

3. Resizing LVM
LVM 'slab' (160M) from 'marvel' (PE 8M), mount /mnt/slab (xfs), then resize to 320M

parted /dev/vdb mklabel gpt
parted /dev/vdb mkpart primary 1M 340M
set 1 lvm on
pvcreate /dev/vdb1
vgcreate -s 8M marvel /dev/vdb1
lvcreate -n slab -L 160M marvel
mkfs.xfs /dev/marvel/slab
mkdir -p /mnt/slab
echo '/dev/marvel/slab /mnt/slab xfs defaults 0 0' >> /etc/fstab
mount -a
lvextend -r -L 320M /dev/marvel/slab
lvdisplay

4. LVM
LVM 'store' using 36PEs (20MB) from 'data', mount /mnt/store, fs ext4

parted /dev/vdb mkpart primary 340M 1150M
pvcreate /dev/vdb2
vgcreate -s 20M data /dev/vdb2
lvcreate -n store -l 36 data
mkfs.ext4 /dev/data/store
mkdir /mnt/store
echo '/dev/data/store /mnt/store ext4 defaults 0 0' >> /etc/fstab
mount -a
df -Th

5. Tuning Performance
Set tuning profile to recommended

dnf install tuned
systemctl enable --now tuned
tuned-adm recommend
tuned-adm profile <recommended_profile_name>
tuned-adm active

6. Create Swap Partition
Create & persist 512MB swap

parted /dev/vdb mkpart primary 1150M 1690M
mkswap /dev/vdb3
echo '/dev/vdb3 swap swap defaults 0 0' >> /etc/fstab
swapon -a
free -h

7. Scripting by Filter
Find files/dirs <10M, with setgid, copy to /root/backup

vim script.sh
#!/bin/bash
find / -size -10M -perm -2000 -exec cp -r {} /root/backup \;
chmod +x script.sh
./script.sh

8. Scripting by Size
Find files/dirs >30M and <50M, setgid, copy to /root/backup

vim script.sh
#!/bin/bash
find / -size +30M -size -50M -perm -2000 -exec cp -rp {} /root/backup \;
chmod +x script.sh
./script.sh