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| Section | Objectives |
|---|---|
| Create simple shell scripts | - Use looping constructs to process files and command-line input - Process script inputs - Conditionally execute code - Process output of shell commands within a script |
| Understand and use essential tools | - Use input-output redirection - Log in and switch users in multi-user targets - List, set, and change standard ugo/rwx permissions - Access a shell prompt and issue commands with correct syntax - Access remote systems using SSH - Locate, read, and use system documentation - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Create and edit text files - Create, delete, copy, and move files and directories - Use grep and regular expressions to analyze text - Create hard and soft links |
| Manage users and groups | - Configure privileged access - Create, delete, and modify local user accounts - Change passwords and adjust password aging for local users - Create, delete, and modify local groups and group memberships |
| Manage security | - Manage default file permissions - List and identify SELinux file and process contexts - Manage SELinux port labels - Restore default file contexts - Configure key-based authentication for SSH - Use Boolean settings to modify SELinux settings - Set enforcing and permissive modes for SELinux - Configure firewall settings using firewall-cmd and firewalld |
| Create and configure file systems | - Mount and unmount network file systems using NFS - Diagnose and correct file permission problems - Configure autofs - Extend existing logical volumes - Create, mount, unmount, and use VFAT, ext4, and XFS file systems |
| Configure local storage | - Create and delete logical volumes - Assign physical volumes to volume groups - Configure systems to mount file systems at boot by UUID or label - Add new partitions, logical volumes, and swap non-destructively - List, create, and delete partitions on GPT disks - Create and remove physical volumes |
| Deploy, configure, and maintain systems | - Schedule tasks using at, cron, and systemd timer units - Install and update software packages - Start and stop services and configure services to start automatically at boot - Modify the system bootloader - Configure systems to boot into a specific target automatically - Configure time service clients |
| Manage software | - Install and remove RPM software packages - Install and remove Flatpak software packages - Configure access to Flatpak repositories - Configure access to RPM repositories |
| Operate running systems | - Identify CPU and memory intensive processes and kill processes - Locate and interpret system log files and journals - Securely transfer files between systems - Preserve system journals - Adjust process scheduling - 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 - Manage tuning profiles |
| Manage basic networking | - Restrict network access using firewalld and firewall-cmd - Configure hostname resolution - Configure network services to start automatically at boot - Configure IPv4 and IPv6 addresses |
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NEW QUESTION # 35
SIMULATION
Create a swap space, set the size is 600 MB, and make it be mounted automatically after rebooting the system (permanent mount).
Answer:
Explanation:
See explanation below.
Explanation/Reference:
Explanation:
if=/dev/zero of=/swapfile bs=1M count=600 mkswap /swapfile
/etc/fstab:
/swapfile swap swap defaults 0 0 mount -a
NEW QUESTION # 36
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:
# 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 # 37
Part 1 (on Node1 Server)
Task 3 [Managing Local Users and Groups]
Create the following users, groups and group memberships:
A group named sharegrp
A user harry who belongs to sharegrp as a secondary group
A user natasha who also belongs to sharegrp as a secondary group
A user copper who does not have access to an interactive shell on the system and who is not a member of sharegrp.
harry, natasha and copper should have the password redhat
Answer:
Explanation:
* [root@node1 ~]# groupadd sharegrp
[root@node1 ~]# useradd harry
[root@node1 ~]# useradd natasha
[root@node1 ~]# usermod -aG sharegrp harry
[root@node1 ~]# usermod -aG sharegrp natasha
[root@node1 ~]# useradd -s /sbin/nologin copper
[root@node1 ~]# echo "redhat" | passwd --stdin harry
[root@node1 ~]# echo "redhat" | passwd --stdin natasha
[root@node1 ~]# echo "redhat" | passwd --stdin copper
### For Checking ###
[root@node1 ~]# su - copper
This account is currently not available.
[root@node1 ~]# su - natasha
[root@node1 ~]# id
[root@node1 ~]# su - harry
[root@node1 ~]# id
NEW QUESTION # 38
SIMULATION
Binding to an external validation server.
System server.domain11.example.com provides a LDAP validation service, your system should bind to this service as required:
Base DN of validation service is dc=example,dc=com
LDAP is used for providing account information and validation information Connecting and using the certification of http://server.domain11.example.com/pub/EXAMPLE-CA-CERT to encrypt After the correct configuration, ldapuser1 can log into your system, it does not have HOME directory until you finish autofs questions, ldapuser1 password is password.
Answer:
Explanation:
See explanation below.
Explanation/Reference:
Explanation: yum -y install sssd authconfig-gtk krb5-workstation authconfig-gtk // open the graphical interface Modify user account database to ldap, fill up DN and LDAP SERVER as questions required, use TLS to encrypt connections making tick, write http://server.domain11.example.com/pub/EXAMPLE-CA-CERT to download ca, authentication method choose ldap password.
You can test if the ldapuser is added by the following command:
Id ldapuser1
Note: user password doesn't not need to set
NEW QUESTION # 39
Add users: user2, user3.
The Additional group of the two users: user2, user3 is the admin group Password: redhat
Answer:
Explanation:
# useradd -G admin user2
# useradd -G admin user3
# passwd user2
redhat
# passwd user3
redhat
NEW QUESTION # 40
......
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