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| Section | Objectives |
|---|---|
| Topic 1: Manage security | - SSH key-based authentication - SELinux file context restoration - Default file permissions - SELinux Boolean settings - SELinux enforcing and permissive modes - Firewall configuration - SELinux port labels - SELinux file and process contexts |
| Topic 2: Configure local storage | - Physical volumes - Adding partitions, logical volumes, and swap - Logical volumes - File system mounting using UUID or labels - GPT disk partitions - Volume groups |
| Topic 3: Operate running systems | - Interrupt the boot process - Network services - Process monitoring and termination - Process scheduling - System logs and journals - Tuning profiles - Secure file transfer - Boot, reboot, and shut down systems - Boot systems into different targets |
| Topic 4: Deploy, configure, and maintain systems | - Bootloader configuration - Time service clients - Service management - Default boot target configuration - Task scheduling with at, cron, and systemd timers - Software installation and updates |
| Topic 5: Create and configure file systems | - File permission troubleshooting - Autofs - Extending logical volumes - VFAT, ext4, and XFS file systems - NFS file systems |
| Topic 6: Manage software | - Install and remove RPM packages - Install and remove Flatpak packages - Configure Flatpak repositories - Configure RPM repositories |
| Topic 7: Manage basic networking | - IPv4 and IPv6 configuration - Network services at boot - Firewall configuration with firewalld and firewall-cmd - Hostname resolution |
| Topic 8: Manage users and groups | - Password and password aging management - Local user account management - Local group management - Privileged access configuration |
| Topic 9: Understand and use essential tools | - File archiving and compression - System documentation - Text analysis with grep and regular expressions - File and directory management - Input and output redirection - Remote system access using SSH - Shell access and command syntax - Creating and editing text files - Hard and soft links - Users and multi-user targets - File permissions |
| Topic 10: Create simple shell scripts | - Conditional execution - Processing script inputs - Processing command output - Looping constructs |
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NEW QUESTION # 47
Install a FTP server, and request to anonymous download from /var/ftp/pub catalog. (it needs you to configure yum direct to the already existing file server.)
Answer:
Explanation:
see explanation below.
Explanation
# cd /etc/yum.repos.d
# vim local.repo
[local]
name=local.repo
baseurl=file:///mnt
enabled=1
gpgcheck=0
# yum makecache
# yum install -y vsftpd
# service vsftpd restart
# chkconfig vsftpd on
# chkconfig --list vsftpd
# vim /etc/vsftpd/vsftpd.conf
anonymous_enable=YES
NEW QUESTION # 48
Find the files owned by harry, and copy it to catalog: /opt/dir
Answer:
Explanation:
# cd /opt/
# mkdir dir
# find / -user harry -exec cp -rfp {} /opt/dir/ \;
NEW QUESTION # 49
Configure passwordless sudo access for members of the ops group to run only /usr/bin/systemctl restart httpd.
Answer:
Explanation:
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 )
NEW QUESTION # 50
: 107 SIMULATION
Add an additional swap partition of 754 MB to your system.
The swap partition should automatically mount when your system boots.
Do not remove or otherwise alter any existing swap partitions on your system.
Answer:
Explanation:
see explanation below.
Explanation
* fdisk -l
* fdisk -cu /dev/vda
p n
e or p select e
default (first): enter
default (last): enter n
default(first): enter
default(first): +754M t (1-5)
l: 82 p
w #reboot
#mkswap /dev/vda5
* vim /etc/fstab
/dev/vda5 swap swap defaults 0 0
wq
* mount -a
* swapon -a
* swapon -s
NEW QUESTION # 51
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
Answer:
Explanation:
# 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
NEW QUESTION # 52
......
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