Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

RHCSA > RHCSA Prep 1 > Flashcards

RHCSA Prep 1 Flashcards

1
Q

Configure YUM repos with the given link (2 repos: 1st is Base and 2nd is AppStream )
Base_url= http://content.example.com/rhel8.0/x86_64/dvd/BaseOS
AppStream_url= http://content.example.com/rhel8.0/x86_64/dvd/AppStream

A

- vim /etc/yum.repos.d/local.repo

[BaseOS]
name=yum repository local
baseurl=http://content.example.com/rhel8.0/x86_64/dvd/BaseOS
gpgcheck=0
enabled=1
[AppStream]
name=yum repository local
baseurl=http://content.example.com/rhel8.0/x86_64/dvd/AppStream
gpgcheck=0
enabled=1

#yum update
yum repolist enabled

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Debug SELinux:
* A web server running on non standard port 82 is having issues serving content. Debug and fix the issues.
* The web server on your system can server all the existing HTML files from
/var/www/html ( NOTE: Do not make any changes to these files )
* Web service should automatically start at boot time.

A

semanage fcontext -a -t httpd_sys_content_t “/var/www/html(/.*)?”
# restorecon -Rv /var/www/html
# semanage port -l | grep http
# semanage port -a -t http_port_t -p tcp 82
#firewall-cmd –permanent –add-port=82/tcp
#firewall-cmd –reload

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Create User accounts with supplementary group.
* Create the group a named “sysadms”.
* Create users as named “natasha” and “harry”, will be the supplementary group “sysadms”.
* Create a user as named “sarah”, should have non-interactive shell and it should be not the member of “sysadms”.
* Password for all users should be “trootent”

A

groupadd sysadms

#groups sysadms
#useradd -G sysadms harry
#useradd -G sysadms natasha
#id harry
#id nathasa
#useradd -s /sbin/nologin sarah
#id sarah
#passwd sarah
#passwd harry
#passwd natasha
#cat /etc/passwd

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Configure a cron job that runs every 1 minutes and executes:

logger “EX200 in progress” as the user natasha.

A

Su – natasha

Crontab -e

*/2 * * * * logger “Ex200 in progress”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Create a collaborative Directory.

* Create the Directory "/home/manager" with the following characteristics.
* Group ownership of "/home/manager" should go to "sysadms" group.
* The directory should have full permission for all members of "sysadms" group but not to the other users except "root".
* Files created in future under "/home/manager" should get the same group ownership .
A

mkdir /home/manager

#chown :sysadms /home/manager
#chmod 2770 /home/manager
#ls -ld /home/manager

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Configure NTP
* Synchronize time of your system with the server classroom.example.com.

A

Answers
# yum install -y chrony
# vi /etc/chrony.conf : server classroom.example.com iburst
# timedatectl set-ntp true
# systemctl restart chronyd
#chronyc sources -v

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Configure AutoFS

* All Ldapuser2 home directory is exported via NFS, which is available on classroom.example.com (172.25.254.254) and your NFS-exports directory is /home/guests for Ldapuser2,
* Ldapuser2's home directory is classroom.example.com:/home/guests/ldapuse2
* Ldapuser2's home directory should be automount autofs service.
* Home directories must be writable by their users.
* while you are able to log in as any of the user ldapuser1 through ldapuser20, the only home directory that is accessible from your system is ldapsuser2
A

yum install -y autofs
# vi /etc/auto.master.d/home.autofs : (/home/guests /etc/auto.home)
# vi /etc/auto.home (* -rw,sync,fstype=nfs4 classroom.example.com:/home/guests/&)
# systemctl enable autofs.service
# systemctl start autofs.service
#ssh ldapuser5@localhost
#cd
#pwd # it should be /home/guests/ldapuser2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

ACL.
* Copy the file /etc/fstab to /var/tmp/fstab and configure the “ACL” as mentioned following.
* The file /var/tmp/fstab should be owned by the “root”.
* The file /var/tmp/fstab should belong to the group “root”.
* The file /var/tmp/fstab should not be executable by any one.
* The user “sarah” should be able to read and write to the file.
* The user “harry” can neither read nor write to the file.
* Other users (future and current) should be able to read /var/tmp/fstab.

A

cp /etc/fstab /var/tmp/fstab

#ls -al /var/tmp/fstab
#setfacl -m u:sarah:rw- /var/tmp/fstab
#setfacl -m u:harry:— /var/tmp/fstab
#setfacl -m o:r– /var/tmp/fstab
# in order to check if everything is ok
getfacl /var/tmp/fstab

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Create user ‘bob’ with 2112 uid and set the password ‘trootent’

A

useradd -u 2112 bob
# passwd bob (trootent)
# id bob

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Locate all files owned by user “harry” and copy it under /root/harry-files

A

find / -user harry -exec cp -rfp {} /root/harry-files/ \; 2/dev/null

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Find a string ‘ich’ from “/usr/share/dict/words” and put it into /root/lines file.

A

grep “ich” /usr/share/dict/words > /root/line_file

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

create an archive ‘/root/backup.tar.bz2’ of /usr/local directory and compress it with bzip2.

A

tar cfv /root/backup.tar.bz2 /usr/local

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Reset root user password and make it ‘trootent’

A

press e for starting system
* put in last last of linuz16 : rd.break
* press ctrl + x
# mount -o remount,rw /sysroot
#chroot /sysroot
#passwd root
#touch /.autorelabel
#exit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Configure YUM Repos
*Base_url= “http://content.example.com/rhel8.0/x86_64/dvd/BaseOS”
*AppStrem_url= “http://content.example.com/rhel8.0/x86_64/dvd/AppStream”

A

scp -r /etc/yum.repos.d/local.repo root@node2:/etc/yum.repos.d/
# cat /etc/yum.repos.d/local.repo
# yum repolist enabled
# yum update
# yum install -y vdo

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  • Resize the logical volume “mylv” so that after reboot the size should be in between 200MB
    to 300MB.
A

df -h

#vgdisplay
#lvextend -L 300M /dev/myvg/mylv
#lvdisplay /dev/myvg/mylv
#resize2fs /dev/myvg/mylv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Add a swap partition of 512MB and mount it permanently.

A

fdisk /dev/vdb
n (create new partition:)
p (check Partition table)
Enter
+512M
t
82
w
mkswap /dev/vdb2
Copy UUID
vim /etc/fstab UUID=XXXXX swap swap defaults 0 0
systemctl daemon-reload
swapon -a
(swapon -s)

17
Q
  • Create the logical volume with the name “wshare” by using 60PE’s from the volume group “wgroup”.
    • Consider each PE size of the volume group as “16 MB”.
    • Mount it on /mnt/wshare with file system ext3S
A

fdisk /dev/vdb
n (create new partition:)
p (check Partition table)
3
Enter
+960M
w
partprobe
pvcreate /dev/vdb3
vgcreate -s 16MB wgroup /dev/vdb3
lvcreate -n wshare -l 60 wgroup
mkfs.ext3 /dev/wgroup/wshare
mkdir /mnt/wshare
vi /etc/fstab (/dev/wgroup/wshare /mnt/wshare ext3 defaults 0 0)
mount -a

18
Q

Create a new VDO partition using to following requirements:
* Use the unpartitioned disk
* Vdo name “Vdo1” and logical size should be 50GB
* Mount it on /vdomount permanently with file system xfs.

A

yum -y install vdo kmod-kvdo

* #systemctl enable vdo.service
* #systemctl start vdo.service
* #lsblk #vdo create –name=Vdo1  --device=/dev/vdd  --vdoLogicalSize=50G #mkfs.xfs -K /dev/mapper/Vdo1 #lsblk ---output=UUID  /dev/mapper/Vdo1 #mkdir /vdomount #vi /etc/fstab (UUID=…………………..   /vdomount   xfs  defaults, x-systemd.requires=vdo.service 0 0) #systemctl daemon-reload
19
Q

Choose the recommended ‘tuned’ profile for your system and set it as the default.

A

tuned-adm active

#tuned-adm recommend (virtual-guest)
#tuned-adm profile virtual-guest

20
Q

Create a container logserver from an image rsyslog in node1 From
registry.lab.example.com
* Configure the container with systemd services by an existing user “Walhalla”,
* Service name should be container-logserver, and configure it to start automatically across reboot.

A

useradd user1 # passwd user1
# yum module install container* -y # ll /var/log/
# vim /etc/systemd/journald.conf [Journal]
Storage=persistent
:wq!
/run/log
# systemctl restart systemd-journald # ll /run/log
# ll /var/log/
# su - user1
# mkdir /home/wallah/container-logserver/
# mkdir /var/log/journal
# exit
# cp -r /var/log/journal/ /home/user1/container-logserver/ # chown -R user1:user1 /home/user1/container-logserver/ # systemctl restart systemd-journald
# reboot
after bootup do ssh to user1 and continue:
# ssh user1@servera.lab.example.com

21
Q

Configure your host journal to store all journal across reboot
* Copy all *.journal from /var/log/journal and all subdirectories to
/home/Walhalla/container_logserver
* Configure automount /var/log/journal from logserver (container) to
/home/walhalla/container_logserver when container starts. node1:user1 steps

A

podman login regisrty.redhat.io # username:
# password:
# podman search rsyslog
# podman pull registry.redhat.io/rhel8/rsyslog # podman image list
# podman run -d –name logserver -v /home/user1/container-logserver:/var/log/journal:Z registry.redhat.io/rhel8/rsyslog
# podman container list # podman ps
# mkdir -p ~/.config/systemd/user
# cd .config/systemd/user/ # loginctl enable-linger
# loginctl show-user user1
# podman generate systemd –name logserver -f -n # systemctl –user daemon-reload

‘in this step, we went to host and one time we rebooted it’
# systemctl –user enable –now container-logserver.service # systemctl –user start –now container-logserver.service
# systemctl –user status –now container-logserver.service
# podman exec -it logserver /bin/bash # ls /var/log/
# exit

RHCSA (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions