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Red Hat EX200: Prerequisites
To be eligible for the test and its associated certificate, you need to have certain skills and knowledge. Thus, you should understand the usage of the essential tools for handling directories, documentation, files, and command-line environments. Also, you need to know how to create simple shell scripts, perform basic container management tasks, and manage groups and users. Your skills in configuring local storage with the use of logical volumes and partitions as well as deploying and maintaining systems, core services, software installation, and updates are also important. You have to possess them if you want to succeed.
RedHat EX200 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Configure local storage | 15% | - Configure swap space - List, create, delete partitions and GPT/MBR layouts - Create and manage LVM physical volumes, volume groups, logical volumes |
| Topic 2: Deploy, configure, and maintain systems | 15% | - Manage software packages with DNF/YUM - Configure firewalld firewall rules - Manage network interfaces and settings with NetworkManager/nmcli |
| Topic 3: Create and configure file systems | 15% | - Create and mount XFS, ext4, VFAT file systems - Maintain entries in /etc/fstab using UUID or labels - Mount and manage network file systems (NFS, autofs) - Manage access control lists (ACLs) |
| Topic 4: Manage users and groups | 10% | - Configure SSH key-based authentication - Manage password policies and sudo access - Create, delete, modify users and groups |
| Topic 5: Manage security | 10% | - Enforce SELinux modes, contexts, booleans, and port labeling - Restore file contexts and troubleshoot SELinux issues |
| Topic 6: Perform basic shell scripting | - Use conditional statements, loops, and script inputs | |
| Topic 7: Operate running systems | 20% | - Boot systems into different targets; manage systemd units - Manage networking and network services - Schedule tasks using cron and at - Manage logging and journaling - Maintain accurate system time with chrony |
| Topic 8: Understand and use essential tools | 25% | - Use input-output redirection - Access remote systems via SSH - Use grep and regular expressions - Archive, compress, unpack files using tar, gzip, bzip2 - Create/edit text files; manage files, directories, links, permissions - Access shell prompt and issue commands with correct syntax |
RedHat Red Hat Certified System Administrator - RHCSARHEL 10 Sample Questions:
Configure the system hostname and configure a static IP address on the existing NetworkManager connection.
Reveal Solution Discussion 0Correct Answer:
See the solution below in Explanation.
Explanation:
Solution:
* Set the hostname:
hostnamectl set-hostname server1.example.com
* Configure the existing connection with a static IP:
nmcli connection modify ens160 ipv4.address 192.168.1.2/24 ipv4.gateway 192.168.1.1 ipv4.dns 1.1.1.1 ipv4.
method manual connection.autoconnect yes
* Bring the connection up:
nmcli connection up ens160
Detailed Explanation:
* hostnamectl is the correct modern command for changing the system hostname.
* nmcli is the correct tool for RHEL 10 network configuration because the old ifcfg style is removed in
RHEL 10, and NetworkManager keyfiles are the supported model.
* ipv4.method manual tells NetworkManager to use static addressing.
* connection.autoconnect yes ensures the profile activates automatically after reboot.
* nmcli connection up ens160 applies the changes immediately.
Configure NTP
Configure your system to synchronize with the NTP server of materials.example.com (Note: materials.example.com is an alias for classroom.example.com).
Correct Answer:
Solution:
# Install the chrony service for configuring NTP server
[root@node1 ~]# yum -y install chrony
[root@node1 ~]# vim /etc/chrony.conf
server materials.example.com iburst
[root@node1 ~]# systemctl restart chronyd
[root@node1 ~]# systemctl enable chronyd
# Check
# Set an arbitrary time
[root@node1 ~]# date -s "1982-1-1"
Fri Jan 1 12:00:00 AM EST 1982
# Restart the NTP server
[root@node1 ~]# systemctl restart chronyd
# Check if the time is synchronized
# Execute after 3-5 seconds, too fast won't synchronize the time
[root@node1 ~]# date
Tue Dec 12 11:40:19 PM EST 2023
# Use the chronyc command to check synchronization status
[root@node1 ~]# chronyc sources -v
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current best, '+' = combined, '-' = not combined,
| / 'x' = may be in error, '~' = too variable, '?' = unusable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
^* classroom.lab.example.com 8 6 17 42 -14us[ -11us] +/- 463us
Create a volume group with a physical extent size of 16 MB and create a logical volume using 30 extents.
Reveal Solution Discussion 0Correct Answer:
See the solution below in Explanation.
Explanation:
Solution:
pvcreate /dev/sdb3
vgcreate -s 16M VG1 /dev/sdb3
lvcreate -l 30 -n LV1 VG1
mkfs.ext4 /dev/VG1/LV1
Detailed Explanation:
* vgcreate -s 16M sets PE size to 16 MB.
* lvcreate -l 30 allocates 30 extents.
* 30 x 16 MB = 480 MB total LV size.
* mkfs.ext4 creates the filesystem.
Create a compressed archive of /etc and verify its file type.
Reveal Solution Discussion 0Correct Answer:
See the solution below in Explanation.
Explanation:
Solution:
tar -zvcf /root/etc_backup.tar.gz /etc
file /root/etc_backup.tar.gz
Detailed Explanation:
* tar creates the archive.
* -z uses gzip compression.
* -v is verbose.
* -c creates the archive.
* -f names the output file.
* file confirms the resulting archive type.
Create Logical Volume
According to the given requirements, create a new logical volume:
- Logical volume named "mylv" belonging to the volume group "myvg" with a size of 50 extents.
- Extent size of logical volumes in volume group "myvg" should be 16 MiB.
- Format the new logical volume with the VFAT filesystem.
- The logical volume should be automatically mounted at /mnt/mydata during system startup.
Correct Answer:
Solution:
# Check the disk layout
[root@node2 ~]# lsblk
# Partition the disk
[root@node2 ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.37.4).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n # Add a new partition
Partition type
p primary (1 primary, 0 extended, 3 free) # Primary partition
e extended (container for logical partitions) # Extended partition
Select (default p): p
Partition number (2-4, default 2): # Press Enter
First sector (1026048-20971519, default 1026048): # Press Enter
***Note: The partition size must be larger than the total size, it should not be exactly equal to. It is recommended to add an extra 200M.
Last sector, +/-sectors or +/-size{K,M,G,T,P} (1026048-20971519, default 20971519): +1200M # Partition size
Created a new partition 2 of type 'Linux' and of size 512 MiB.
Command (m for help): w # Save and exit
The partition table has been altered.
Syncing disks.
# Create volume group and logical volume
[root@node2 ~]# vgcreate -s 16M myvg /dev/vdb4
[root@node2 ~]# lvcreate -l 50 -n mylv myvg
# Install vfat support
[root@node2 ~]# yum provides */mkfs.vfat
[root@node2 ~]# yum -y install dosfstools
# Format the logical volume with vfat filesystem
[root@node2 ~]# mkfs.vfat /dev/myvg/mylv
# Create mount point
[root@node2 ~]# mkdir /mnt/mydata
# Update /etc/fstab for automatic mounting
[root@node2 ~]# vim /etc/fstab
/dev/myvg/mylv /mnt/mydata vfat defaults 0 0
# Mount the logical volume
[root@node2 ~]# mount -a
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