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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Understand and use essential tools | 25% | - Use input-output redirection - Use grep and regular expressions - Create/edit text files; manage files, directories, links, permissions - Archive, compress, unpack files using tar, gzip, bzip2 - Access remote systems via SSH - Access shell prompt and issue commands with correct syntax |
| Topic 2: Manage security | 10% | - Restore file contexts and troubleshoot SELinux issues - Enforce SELinux modes, contexts, booleans, and port labeling |
| Topic 3: Perform basic shell scripting | - Use conditional statements, loops, and script inputs | |
| Topic 4: Deploy, configure, and maintain systems | 15% | - Manage network interfaces and settings with NetworkManager/nmcli - Configure firewalld firewall rules - Manage software packages with DNF/YUM |
| Topic 5: Operate running systems | 20% | - Manage logging and journaling - Maintain accurate system time with chrony - Manage networking and network services - Boot systems into different targets; manage systemd units - Schedule tasks using cron and at |
| Topic 6: Create and configure file systems | 15% | - Maintain entries in /etc/fstab using UUID or labels - Mount and manage network file systems (NFS, autofs) - Manage access control lists (ACLs) - Create and mount XFS, ext4, VFAT file systems |
| Topic 7: Manage users and groups | 10% | - Manage password policies and sudo access - Create, delete, modify users and groups - Configure SSH key-based authentication |
| Topic 8: 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 |
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NEW QUESTION # 51
There are two different networks 192.168.0.0/24 and 192.168.1.0/24. Where 192.168.0.254 and
192.168.1.254 IP Address are assigned on Server. Verify your network settings by pinging 192.168.1.0/24 Network's Host.
Answer:
Explanation:
vi /etc/sysconfing/network NETWORKING=yes HOSTNAME=station?.example.com GATEWAY=192.168.0.254 service network restart
2.vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=X.X.X.X
NETMASK=X.X.X.X
GATEWAY=192.168.0.254
ifdown eth0
ifup eth0
NEW QUESTION # 52
Some users home directory is shared from your system. Using showmount -e localhost command, the shared directory is not shown. Make access the shared users home directory.
Answer:
Explanation:
see explanation below.
Explanation
* Verify the File whether Shared or not ? : cat /etc/exports
* Start the nfs service: service nfs start
* Start the portmap service: service portmap start
* Make automatically start the nfs service on next reboot: chkconfig nfs on
* Make automatically start the portmap service on next reboot: chkconfig portmap on
* Verify either sharing or not: showmount -e localhost
* Check that default firewall is running on system?
If running flush the iptables using iptables -F and stop the iptables service.
NEW QUESTION # 53
18. Create a system monitoring script
* Create a script named systeminfo.
* The script must be located in /usr/local/bin.
* The script is used to obtain information about the current system processes. It must output the following process information in order:
Process owner
Process PID
Virtual memory usage
Resident (physical) memory usage
CPU usage percentage
The output must be sorted by CPU usage percentage, with the process that consumes the most CPU displayed last.
Answer:
Explanation:
Solution:
[root@node1 ~]# vim /usr/local/bin/systeminfo
#!/bin/bash
ps -xao user,pid,vsz,rss,%cpu --sort=pcpu
Using sort:
#!/bin/bash
ps -xao user,pid,vsz,rss,%cpu | sort -fnk 5
Verify:
[root@node1 ~]# chmod +x /usr/local/bin/systeminfo
[root@node1 ~]# systeminfo
Explanation of ps -xao:
x - Display processes without a controlling terminal, and show the full path of each command
a - Display all processes associated with a terminal, except session leaders
o - User-defined output format
NEW QUESTION # 54
Part 1 (on Node1 Server)
Task 14 [Managing SELinux Security]
You will configure a web server running on your system serving content using a non-standard port (82)
Answer:
Explanation:
* [root@node1 ~]# curl http://node1.domain15.example.com
curl: (7) Failed to connect to node1.domain15.example.com port 80: Connection refused
[root@node1 ~]# yum install httpd
[root@node1 ~]# systemctl enable --now httpd
Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service โ /usr/lib/systemd/system/httpd.service.
[root@node1 ~]# systemctl start httpd
[root@node1 ~]# systemctl status httpd
Status: "Running, listening on: port 80"
* [root@node1 ~]# wget http://node1.domain15.example.com
2021-03-23 13:27:28 ERROR 403: Forbidden.
[root@node1 ~]# semanage port -l | grep http
http_port_t tcp 80, 81, 443, 488, 8008, 8009, 8443, 9000
[root@node1 ~]# semanage port -a -t http_port_t -p tcp 82
[root@node1 ~]# semanage port -l | grep http
http_port_t tcp 82, 80, 81, 443, 488, 8008, 8009, 8443, 9000
[root@node1 ~]# firewall-cmd --zone=public --list-all
[root@node1 ~]# firewall-cmd --permanent --zone=public --add-port=82/tcp
[root@node1 ~]# firewall-cmd --reload
[root@node1 ~]# curl http://node1.domain15.example.com
OK
* root@node1 ~]# wget http://node1.domain15.example.com:82
Connection refused.
[root@node1 ~]# vim /etc/httpd/conf/httpd.conf
Listen 82
[root@node1 ~]# systemctl restart httpd
[root@node1 ~]# wget http://node1.domain15.example.com:82
2021-03-23 13:31:41 ERROR 403: Forbidden.
[root@node1 ~]# curl http://node1.domain15.example.com:82
OK
NEW QUESTION # 55
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 # 56
......
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