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| Section | Objectives |
|---|---|
| Create simple shell scripts | - Conditional execution - Processing command output - Looping constructs - Processing script inputs |
| Configure local storage | - Logical volumes - File system mounting using UUID or labels - Adding partitions, logical volumes, and swap - Volume groups - GPT disk partitions - Physical volumes |
| Manage users and groups | - Local group management - Privileged access configuration - Password and password aging management - Local user account management |
| Deploy, configure, and maintain systems | - Service management - Software installation and updates - Time service clients - Default boot target configuration - Bootloader configuration - Task scheduling with at, cron, and systemd timers |
| Manage software | - Install and remove Flatpak packages - Install and remove RPM packages - Configure RPM repositories - Configure Flatpak repositories |
| Manage security | - SSH key-based authentication - SELinux port labels - SELinux file context restoration - Default file permissions - Firewall configuration - SELinux Boolean settings - SELinux enforcing and permissive modes - SELinux file and process contexts |
| Manage basic networking | - IPv4 and IPv6 configuration - Network services at boot - Firewall configuration with firewalld and firewall-cmd - Hostname resolution |
| Create and configure file systems | - File permission troubleshooting - VFAT, ext4, and XFS file systems - NFS file systems - Autofs - Extending logical volumes |
| Understand and use essential tools | - File archiving and compression - Text analysis with grep and regular expressions - Hard and soft links - File and directory management - Creating and editing text files - System documentation - Remote system access using SSH - Users and multi-user targets - File permissions - Shell access and command syntax - Input and output redirection |
| Operate running systems | - System logs and journals - Network services - Boot, reboot, and shut down systems - Process monitoring and termination - Interrupt the boot process - Process scheduling - Boot systems into different targets - Tuning profiles - Secure file transfer |
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NEW QUESTION # 46
Find the rows that contain abcde from file /etc/testfile, and write it to the file/tmp/testfile, and the sequence is requested as the same as /etc/testfile.
Answer:
Explanation:
Answer see in the explanation.
Explanation/Reference:
# cat /etc/testfile | while read line;
do
echo $line | grep abcde | tee -a /tmp/testfile
done
OR
grep `abcde' /etc/testfile > /tmp/testfile
NEW QUESTION # 47
Part 1 (on Node1 Server)
Task 15 [Running Containers]
Create a container named logserver with the image rhel8/rsyslog found from the registry registry.domain15.example.com:5000 The container should run as the root less user shangril a. use redhat as password [sudo user] Configure the container with systemd services as the shangrila user using the service name, "container-logserver" so that it can be persistent across reboot.
Use admin as the username and admin123 as the credentials for the image registry.
Answer:
Explanation:
* [root@workstation ~]# ssh shangrila@node1
[shangrila@node1 ~]$ podman login registry.domain15.example.com:5000
Username: admin
Password:
Login Succeeded!
[shangrila@node1 ~]$ podman pull registry.domain15.example.com:5000/rhel8/rsyslog
[shangrila@node1 ~]$ podman run -d --name logserver registry.domain15.example.com:5000/rhel8/rsyslog
021b26669f39cc42b8e94eab886ba8293d6247bf68e4b0d76db2874aef284d6d
[shangrila@node1 ~]$ mkdir -p ~/.config/systemd/user
[shangrila@node1 ~]$ cd ~/.config/systemd/user
* [shangrila@node1 user]$ podman generate systemd --name logserver --files --new
/home/shangrila/.config/systemd/user/container-logserver.service
[shangrila@node1 ~]$ systemctl --user daemon-reload
[shangrila@node1 user]$ systemctl --user enable --now container-logserver.service
[shangrila@node1 ~]$ podman ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7d9f7a8a4d63 registry.domain15.example.com:5000/rhel8/rsyslog:latest /bin/rsyslog.sh 2 seconds ago logserver
[shangrila@node1 ~]$ sudo reboot
[shangrila@node1 ~]$ cd .config/systemd/user
[shangrila@node1 user]$ systemctl --user status
NEW QUESTION # 48
SIMULATION
Configure your web services, download from http://instructor.example.com/pub/serverX.html And the services must be still running after system rebooting.
Answer:
Explanation:
See explanation below.
Explanation/Reference:
Explanation: cd /var/www/html
wget http://instructor.example.com/pub/serverX.html mv serverX.html index.html /etc/init.d/httpd restart chkconfig httpd on
NEW QUESTION # 49
The firewall must be open.
Answer:
Explanation:
see explanation below.
Explanation
/etc/init.d/iptables start
iptables -F
iptables -X
iptables -Z
/etc/init.d/iptables save
chkconfig iptables on
NEW QUESTION # 50
Configure HTTP service access on a non-standard port 82 and allow it through SELinux and firewalld.
Answer:
Explanation:
See the solution below in Explanation.
Explanation:
Solution:
* Open the firewall port and HTTP service:
firewall-cmd --permanent --add-port=82/tcp
firewall-cmd --permanent --add-service=http
firewall-cmd --reload
* Add SELinux port labeling:
semanage port -a -t http_port_t -p tcp 82
Detailed Explanation:
* firewall-cmd --permanent makes the change persistent.
* --add-port=82/tcp opens the custom TCP port.
* --add-service=http keeps standard HTTP allowed too.
* SELinux blocks services on unexpected ports unless the port is labeled correctly.
* http_port_t tells SELinux that port 82 is valid for web services.
NEW QUESTION # 51
......
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