Red Hat EX200 Online Practice Questions and Exam Preparation

Red Hat EX200 Online Questions & Answers

• Question 1:

  Part 2 (on Node2 Server)

  Task 6 [Implementing Advanced Storage Features]

  Add a new disk to your virtual machine with a ize of 10 GiB

  On this disk, create a VDO volume with a size of 50 GiB and mount it persistently on /vbread with xfs filesystem

  Check the anser in explanation.

  ---

  explanation:

  * [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vdd 252:48 0 5G 0 disk vde 252:64 0 10G 0 disk [root@node2 ~]# yum install kmod-kvdo vdo [root@node2 ~]# systemctl enable --now vdo [root@node2 ~]# systemctl start vdo [root@node2 ~]# systemctl status vdo [root@node2 ~]# vdo create --name=vdo1 --device=/dev/vde --vdoLogicalSize=50G [root@node2 ~]# vdostats --hu Device Size Used Available Use% Space saving% /dev/mapper/vdo1 10.0G 4.0G 6.0G 40% N/A [root@node2 ~]# mkfs.xfs -K /dev/mapper/vdo1

  * [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vde 252:64 0 10G 0 disk vdo1 253:4 0 50G 0 vdo [root@node2 ~]# mkdir /vbread [root@node2 ~]# blkid /dev/mapper/vdo1: UUID="1ec7a341-6051-4aed-8a2c-4d2d61833227" BLOCK_SIZE="4096" TYPE="xfs" [root@node2 ~]# vim /etc/fstab UUID=1ec7a341-6051-4aed-8a2c-4d2d61833227 /vbread xfs defaults,x- systemd.requires=vdo.service 0 0 [root@node2 ~]# mount /dev/mapper/vdo1 /vbread/ [root@node2 ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/vdo1 xfs 50G 390M 50G 1% /vbread

• Question 2:

  Part 1 (on Node1 Server)

  Task 1 [Managing Networking]

  Please create new network connection with existing interface (enp1s0) using provided values:

  IPv4: 172.25.X.10/255.255.255.0 (where X is your domain number: Domain15)

  Gateway: 172.25.X.2

  DNS server: 172.25.X.2

  Add the following secondary IP addresses statically to your current running connection. Do this in a way that does not compromise your existing settings:

  IPv4: 10.0.0.5/24 and set the hostname node1.domain15.example.com

  Check the anser in explanation.

  ---

  explanation:

  * [root@node1 ~]# nmcli connection show [root@node1 ~]# nmcli connection add con-name static ifname enp1s0 type ethernet ipv4.addresses 172.25.15.10/24 ipv4.gateway 172.25.15.2 ipv4.dns 172.25.15.2 [root@node1 ~]# nmcli connection modify static ipv4.method manual connection.autoconnect yes [root@node1 ~]# nmcli connection modify static +ipv4.addresses 10.0.0.5/24 [root@node1 ~]# nmcli connection up static [root@node1 ~]# nmcli connection show [root@node1 ~]# hostnamectl set-hostname node1.domain15.example.com [root@node1 ~]# hostnamectl status [root@node1 ~]# nmcli connection down static * [root@node1 ~]# nmcli connection up static [root@node1 ~]# ip addr show [root@node1 ~]# reboot ### For checking ### [root@node1 ~]# ip addr show [root@node1 ~]# netstat -nr [root@node1 ~]# cat /etc/resolv.conf

• Question 3:

  Part 1 (on Node1 Server)

  Task 12 [Accessing Network-Attached Storage]

  Configure autofs to automount the home directories of user remoteuserX. Note the following:

  utility.domain15.example.com(172.25.15.9), NFS-exports /netdir to your system, where user is remoteuserX where X is your domain number

  remoteuserX home directory is utility.domain15.example.com:/netdir/remoteuserX

  remoteuserX home directory should be auto mounted locally at /netdir as /netdir/remoteuserX

  Home directories must be writable by their users while you are able to login as any of the remoteuserX only home directory that is accessible from your system

  Check the anser in explanation.

  ---

  explanation:

  * [root@host ~]#systemctl enable sssd.service [root@host ~]#systemctl start sssg.service [root@host ~]#getent passwd remoteuser15 [root@host ~]#yum install autofs [root@host ~]#vim /etc/auto.master.d/home9.autofs /netdir/remoteuser15 /etc/auto.home9 [root@host ~]#vim /etc/auto.home9 remoteuser15 –rw,sync utility.network15.example.com:/netdir/remoteuser15/and [root@host ~]#systemctl enable autofs [root@host ~]#systemctl restart autofs [root@host ~]#su - remoteuser15

• Question 4:

  Part 1 (on Node1 Server)

  Task 5 [Controlling Access to Files with ACLs]

  Copy the file /etc/fstab to /var/tmp. Configure the following permissions on /var/tmp/fstab.

  The file /var/tmp/fstab is owned by root user

  The file /var/tmp/fstab is belongs to the root group

  The file /var/tmp/fstab should be executable by anyone

  The user harry is able to read and write on /var/tmp/fstab

  The user natasha can neither read or write on /var/tmp/fstab

  All other users (Current or future) have the ability to read /var/tmp/fstab

  Check the anser in explanation.

  ---

  explanation:

  * [root@node1 ~]# cp -p /etc/fstab /var/tmp/ [root@node1 ~]# ls -lrt /etc/fstab [root@node1 ~]# ls -lrt /var/tmp/fstab [root@node1 ~]# chmod a+x /var/tmp/fstab [root@node1 ~]# getfacl /var/tmp/fstab [root@node1 ~]# setfacl -m u:harry:rw- /var/tmp/fstab [root@node1 ~]# setfacl -m u:natasha:--- /var/tmp/fstab [root@node1 ~]# getfacl /var/tmp/fstab getfacl: Removing leading '/' from absolute path names # file: var/tmp/fstab # owner: root # group: root user::rwx user:harry:rwuser:natasha:--group::r-x mask::rwx other::r-x

  * [root@node1 ~]# su - natasha [natasha@node1 ~]$ cat /var/tmp/fstab cat: /var/tmp/fstab: Permission denied

• Question 5:

  Part 1 (on Node1 Server)

  Task 9 [Managing Files from the Command Line]

  Search the string nologin in the /etc/passwd file and save the output in /root/strings

  Check the anser in explanation.

  ---

  explanation:

  * [root@node1 ~]# cat /etc/passwd | grep nologin > /root/strings [root@node1 ~]# cat /root/strings bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

• Question 6:

  Part 1 (on Node1 Server)

  Task 14 [Managing SELinux Security]

  You will configure a web server running on your system serving content using a non- standard port (82)

  Check the anser in explanation.

  ---

  explanation:

  *

  [root@node1 ~]# curl http://node1.domain15.example.com curl: (7) Failed to connect to node1.domain15.example.com port 80: Connection refused [root@node1 ~]# yum install httpd

  [root@node1 ~]# systemctl enable --now httpd

  Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service /usr/lib/systemd/system/httpd.service.

  [root@node1 ~]# systemctl start httpd

  [root@node1 ~]# systemctl status httpd

  Status: "Running, listening on: port 80"

  *

  [root@node1 ~]# wget http://node1.domain15.example.com 2021-03-23 13:27:28 ERROR 403: Forbidden.

  [root@node1 ~]# semanage port -l | grep http http_port_t tcp 80, 81, 443, 488, 8008, 8009, 8443, 9000 [root@node1 ~]# semanage port -a -t http_port_t -p tcp 82 [root@node1 ~]# semanage port -l | grep http http_port_t tcp 82, 80, 81, 443, 488, 8008, 8009, 8443, 9000 [root@node1 ~]# firewall-cmd --zone=public --list-all [root@node1 ~]# firewall-cmd --permanent --zone=public --add-port=82/tcp [root@node1 ~]# firewall-cmd --reload [root@node1 ~]# curl http://node1.domain15.example.com OK

  * root@node1 ~]# wget http://node1.domain15.example.com:82 Connection refused. [root@node1 ~]# vim /etc/httpd/conf/httpd.conf Listen 82 [root@node1 ~]# systemctl restart httpd [root@node1 ~]# wget http://node1.domain15.example.com:82 2021-03-23 13:31:41 ERROR 403: Forbidden. [root@node1 ~]# curl http://node1.domain15.example.com:82 OK

• Question 7:

  Part 1 (on Node1 Server)

  Task 7 [Accessing Linux File Systems]

  Find all the files owned by user natasha and redirect the output to /home/alex/files.

  Find all files that are larger than 5MiB in the /etc directory and copy them to /find/largefiles.

  Check the anser in explanation.

  ---

  explanation:

  [root@node1 ~]# find / -name natasha -type f > /home/natasha/files [root@node1 ~]# cat /home/natasha/files /var/spool/mail/natasha /mnt/shares/natasha [root@node1 ~]# mkdir /find [root@node1 ~]# find /etc -size +5M > /find/largefiles [root@node1 ~]# cat /find/largefiles /etc/selinux/targeted/policy/policy.31 /etc/udev/hwdb.bin

• Question 8:

  Part 1 (on Node1 Server)

  Task 8 [Managing Local Users and Groups]

  Create a user fred with a user ID 3945. Give the password as iamredhatman

  Check the anser in explanation.

  ---

  explanation:

  * [root@node1 ~]# useradd -u 3945 fred [root@node1 ~]# echo "iamredhatman" | passwd --stdin fred Changing password for user fred. passwd: all authentication tokens updated successfully

• Question 9:

  Part 1 (on Node1 Server)

  Task 4 [Controlling Access to Files]

  Create collaborative directory /mnt/shares with the following characteristics:

  Group ownership of /mnt/shares should be sharegrp.

  The directory should be readable, writable and accessible to member of sharegrp but not to any other user. (It is understood that root has access to all files and directories on the system)

  Files created in /mnt/shares automatically have group ownership set to the sharegrp group.

  Check the anser in explanation.

  ---

  explanation:

  * [root@node1 ~]# mkdir -p /mnt/shares [root@node1 ~]# ls -lrt /mnt/ [root@node1 ~]# chgrp sharegrp /mnt/shares/ [root@node1 ~]# chmod 2770 /mnt/shares/ [root@node1 ~]# ls -lrt /mnt/ ### For Checking ### [root@node1 ~]# su - harry [harry@node1 ~]$ cd /mnt/shares/ [harry@node1 shares]$ touch harry [harry@node1 shares]$ logout [root@node1 ~]# su - natasha [natasha@node1 ~]$ cd /mnt/shares/ [natasha@node1 shares]$ touch natasha [natasha@node1 shares]$ ls -lrt -rw-rw-r--. 1 harry sharegrp 0 Mar 21 06:03 harry -rw-rw-r--. 1 natasha sharegrp 0 Mar 21 06:03 natasha

• Question 10:

  Part 2 (on Node2 Server)

  Task 5 [Managing Logical Volumes]

  Add an additional swap partition of 656 MiB to your system. The swap partition should automatically mount when your system boots

  Do not remove or otherwise alter any existing swap partition on your system

  Check the anser in explanation.

  ---

  explanation:

  * [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vdc 252:32 0 5G 0 disk vdc1 252:33 0 4.1G 0 part datavg-datalv 253:3 0 3.9G 0 lvm /data vdd 252:48 0 5G 0 disk vde 252:64 0 10G 0 disk [root@node2 ~]# swapon -s Filename Type Size Used Priority /dev/dm-1 partition 2097148 1548 -2 [root@node2 ~]# free -m total used free shared buff/cache available Mem: 1816 1078 104 13 633 573 Swap: 2047 1 2046 [root@node2 ~]# parted /dev/vdc print Number Start End Size Type File system Flags 1 1049kB 4404MB 4403MB primary lvm

  * [root@node2 ~]# parted /dev/vdc mkpart primary linux-swap 4404MiB 5060MiB [root@node2 ~]# mkswap /dev/vdc2 Setting up swapspace version 1, size = 656 MiB (687861760 bytes) no label, UUID=9faf818f-f070-4416-82b2-21a41988a9a7 [root@node2 ~]# swapon -s Filename Type Size Used Priority /dev/dm-1 partition 2097148 1804 -2 [root@node2 ~]# swapon /dev/vdc2

  * [root@node2 ~]# swapon -s Filename Type Size Used Priority /dev/dm-1 partition 2097148 1804 -2 /dev/vdc2 partition 671740 0 -3 [root@node2 ~]# blkid /dev/vdc2: UUID="9faf818f-f070-4416-82b2-21a41988a9a7" TYPE="swap" PARTUUID="0f22a35f-02" [root@node2 ~]# vim /etc/fstab UUID=9faf818f-f070-4416-82b2-21a41988a9a7 swap swap defaults 0 0 [root@node2 ~]# reboot [root@node2 ~]# swapon -s Filename Type Size Used Priority /dev/dm-1 partition 2097148 1804 -2 /dev/vdc2 partition 671740 0 -3