The Red Hat Certified Engineer (EX200) Exam Process
The certification system for Red Hat Certified Engineers has organized around three types of exams, plus one optional advanced certification exam. Smarter exams, like the RHCSA and RHCE. Common LPI certification. The Red Hat Certified Engineer (EX200) is regulated by ISO/IEC 17024, the global standard for certifying personnel. Technologies and performance areas covered include Administering Linux, networks, storage systems, databases, Internet servers, web applications. Operating systems, networking, programming, databases, web servers. Separately charged optional exam.
Reference: https://www.redhat.com/en/services/training/ex200-red-hat-certified-system-administrator-rhcsa-exam
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RedHat EX200 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Manage security | - Configure firewall settings using firewall-cmd and firewalld - Use Boolean settings to modify SELinux settings - Manage default file permissions - List and identify SELinux file and process contexts - Restore default file contexts - Manage SELinux port labels - Configure key-based authentication for SSH - Set enforcing and permissive modes for SELinux |
| Understand and use essential tools | - Access a shell prompt and issue commands with correct syntax - Create and edit text files - Locate, read, and use system documentation - Use input-output redirection - List, set, and change standard ugo/rwx permissions - Access remote systems using SSH - Use grep and regular expressions to analyze text - Log in and switch users in multi-user targets - Create hard and soft links - Create, delete, copy, and move files and directories - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 |
| Manage users and groups | - Create, delete, and modify local groups and group memberships - Change passwords and adjust password aging for local users - Configure privileged access - Create, delete, and modify local user accounts |
| Configure local storage | - Configure systems to mount file systems at boot by UUID or label - Create and remove physical volumes - Create and delete logical volumes - Assign physical volumes to volume groups - List, create, and delete partitions on GPT disks - Add new partitions, logical volumes, and swap non-destructively |
| Manage basic networking | - Configure IPv4 and IPv6 addresses - Configure hostname resolution - Configure network services to start automatically at boot - Restrict network access using firewalld and firewall-cmd |
| Manage software | - Install and remove RPM software packages - Configure access to RPM repositories - Install and remove Flatpak software packages - Configure access to Flatpak repositories |
| Create and configure file systems | - Mount and unmount network file systems using NFS - Diagnose and correct file permission problems - Create, mount, unmount, and use VFAT, ext4, and XFS file systems - Extend existing logical volumes - Configure autofs |
| Deploy, configure, and maintain systems | - Configure time service clients - Configure systems to boot into a specific target automatically - Modify the system bootloader - Start and stop services and configure services to start automatically at boot - Install and update software packages - Schedule tasks using at, cron, and systemd timer units |
| Create simple shell scripts | - Process script inputs - Use looping constructs to process files and command-line input - Conditionally execute code - Process output of shell commands within a script |
| Operate running systems | - Adjust process scheduling - Manage tuning profiles - Securely transfer files between systems - Preserve system journals - Identify CPU and memory intensive processes and kill processes - Locate and interpret system log files and journals - Boot systems into different targets manually - Start, stop, and check the status of network services - Interrupt the boot process to gain access to a system - Boot, reboot, and shut down a system normally |
RedHat Red Hat Certified System Administrator - RHCSARHEL 10 Sample Questions:
Add sudo Permission Configuration
Allow members of the sysmgrs group to use sudo without entering a password.
Correct Answer:
Solution:
[root@node1 ~]# visudo
...
%wheel ALL=(ALL) NOPASSWD: ALL
%sysmgrs ALL=(ALL) NOPASSWD: ALL
# Verification (mandatory operation)
[root@node1 ~]# su - natasha
[natasha@node1 ~]# sudo cat /etc/shadow
Debugging SELinux
A web server running on non-standard port 82 encounters issues while serving content. Debug and resolve the problem to meet the following conditions:
- The web server on the system can serve HTML files hosted in /var/www/html (Note: Do not delete or modify existing file contents)
- The web server can serve content on port 82
- The web server can start automatically at system boot
Correct Answer:
Solution:
# Check which package provides the semanage command
[root@node1 ~]# yum provides "*/semanage"
# Install the semanage command
[root@node1 ~]# yum -y install policycoreutils-python-utils
[root@node1 ~]# semanage port -l |grep http
[root@node1 ~]# semanage port -a -t http_port_t -p tcp 82
# Alternatively, you can use man semanage port, then search for EXAMPLE.
[root@node1 ~]# systemctl restart httpd
[root@node1 ~]# systemctl enable httpd
# Verification, seeing the source code indicates correctness (mandatory operation)
[root@node1 ~]# curl http://node1.domain250.example.com:82
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.
Configure the host to boot into multi-user.target by default.
Reveal Solution Discussion 0Correct Answer:
See the solution below in Explanation.
Explanation:
Solution:
systemctl set-default multi-user.target
systemctl get-default
Detailed Explanation:
* set-default changes the boot target persistently.
* get-default verifies the result.
* multi-user.target is the standard non-graphical multi-user boot target.
Configure passwordless sudo access for members of the ops group to run only /usr/bin/systemctl restart httpd.
Reveal Solution Discussion 0Correct Answer:
See the solution below in Explanation.
Explanation:
Solution:
groupadd ops
visudo -f /etc/sudoers.d/ops-restart-httpd
Add this line to the file:
%ops ALL=(ALL) NOPASSWD: /usr/bin/systemctl restart httpd
Set correct permissions:
chmod 440 /etc/sudoers.d/ops-restart-httpd
visudo -cf /etc/sudoers.d/ops-restart-httpd
Detailed Explanation:
* Using /etc/sudoers.d/ is the standard safe approach.
* visudo validates syntax and helps prevent syntax errors.
* %ops applies the rule to the whole group.
* Restricting the exact command is better than granting broad sudo access. Red Hat's RHEL 10 security
hardening guide documents sudo configuration through sudoers. ( Red Hat Documentation )
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