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| Section | Objectives |
|---|---|
| Topic 1: Manage security | - SELinux Boolean settings - Default file permissions - Firewall configuration - SELinux file context restoration - SELinux enforcing and permissive modes - SELinux file and process contexts - SSH key-based authentication - SELinux port labels |
| Topic 2: Manage users and groups | - Local group management - Privileged access configuration - Password and password aging management - Local user account management |
| Topic 3: Understand and use essential tools | - Users and multi-user targets - Creating and editing text files - Input and output redirection - Shell access and command syntax - System documentation - File and directory management - Text analysis with grep and regular expressions - File archiving and compression - Hard and soft links - File permissions - Remote system access using SSH |
| Topic 4: Manage basic networking | - Network services at boot - Firewall configuration with firewalld and firewall-cmd - Hostname resolution - IPv4 and IPv6 configuration |
| Topic 5: Deploy, configure, and maintain systems | - Default boot target configuration - Service management - Bootloader configuration - Task scheduling with at, cron, and systemd timers - Software installation and updates - Time service clients |
| Topic 6: Configure local storage | - GPT disk partitions - Logical volumes - File system mounting using UUID or labels - Adding partitions, logical volumes, and swap - Physical volumes - Volume groups |
| Topic 7: Manage software | - Configure Flatpak repositories - Install and remove RPM packages - Configure RPM repositories - Install and remove Flatpak packages |
| Topic 8: Create and configure file systems | - File permission troubleshooting - NFS file systems - VFAT, ext4, and XFS file systems - Autofs - Extending logical volumes |
| Topic 9: Create simple shell scripts | - Processing command output - Processing script inputs - Looping constructs - Conditional execution |
| Topic 10: Operate running systems | - System logs and journals - Process monitoring and termination - Network services - Interrupt the boot process - Secure file transfer - Boot, reboot, and shut down systems - Boot systems into different targets - Process scheduling - Tuning profiles |
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NEW QUESTION # 14
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).
Answer:
Explanation:
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 '
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