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| Section | Objectives |
|---|---|
| Topic 1: Deploy, configure, and maintain systems | - Configure time service clients - Schedule tasks using at, cron, and systemd timer units - Start and stop services and configure services to start automatically at boot - Install and update software packages - Modify the system bootloader - Configure systems to boot into a specific target automatically |
| Topic 2: Manage software | - Configure access to RPM repositories - Install and remove RPM software packages - Configure access to Flatpak repositories - Install and remove Flatpak software packages |
| Topic 3: Manage security | - Configure key-based authentication for SSH - Manage default file permissions - Configure firewall settings using firewall-cmd and firewalld - List and identify SELinux file and process contexts - Set enforcing and permissive modes for SELinux - Restore default file contexts - Manage SELinux port labels - Use Boolean settings to modify SELinux settings |
| Topic 4: Operate running systems | - Boot systems into different targets manually - Interrupt the boot process to gain access to a system - Manage tuning profiles - Identify CPU and memory intensive processes and kill processes - Boot, reboot, and shut down a system normally - Securely transfer files between systems - Adjust process scheduling - Locate and interpret system log files and journals - Start, stop, and check the status of network services - Preserve system journals |
| Topic 5: Understand and use essential tools | - List, set, and change standard ugo/rwx permissions - Create hard and soft links - Access a shell prompt and issue commands with correct syntax - Create, delete, copy, and move files and directories - Log in and switch users in multi-user targets - Create and edit text files - Use grep and regular expressions to analyze text - Access remote systems using SSH - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Locate, read, and use system documentation - Use input-output redirection |
| Topic 6: Create and configure file systems | - Diagnose and correct file permission problems - Extend existing logical volumes - Create, mount, unmount, and use VFAT, ext4, and XFS file systems - Configure autofs - Mount and unmount network file systems using NFS |
| Topic 7: Manage basic networking | - Restrict network access using firewalld and firewall-cmd - Configure IPv4 and IPv6 addresses - Configure network services to start automatically at boot - Configure hostname resolution |
| Topic 8: Create simple shell scripts | - Process output of shell commands within a script - Conditionally execute code - Use looping constructs to process files and command-line input - Process script inputs |
| Topic 9: Manage users and groups | - Create, delete, and modify local user accounts - Create, delete, and modify local groups and group memberships - Configure privileged access - Change passwords and adjust password aging for local users |
| Topic 10: Configure local storage | - Add new partitions, logical volumes, and swap non-destructively - Create and remove physical volumes - List, create, and delete partitions on GPT disks - Configure systems to mount file systems at boot by UUID or label - Create and delete logical volumes - Assign physical volumes to volume groups |
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NEW QUESTION # 43
Configure Cron Job
Configure a cron job to automatically execute /usr/bin/echo hello every day at 14:23 for the user harry.
Answer:
Explanation:
Solution:
[root@node1 ~]# systemctl status crond
[root@node1 ~]# systemctl enable crond
[root@node1 ~]# crontab -e -u harry
23 14 * * * /usr/bin/echo hello
# Verification
[root@node1 ~]# crontab -l -u harry
NEW QUESTION # 44
The following command is issued on two docker nodes:
docker network create --driver bridge isolated_nw
Afterwards, one container is started at each node with the parameter --network=isolated_nw. It turns out
that the containers can not interact with each other. What must be done in order to allow the containers to
interact with each other? (Choose two correct answers.)
Answer: B,D
Explanation:
Explanation/Reference:
Reference https://docs.docker.com/v17.09/engine/userguide/networking/#bridge-networks
NEW QUESTION # 45
Create the user named eric and deny to interactive login.
Answer:
Explanation:
see explanation below.
Explanation
* useradd eric
* passwd eric
* vi /etc/passwd
* eric:x:505:505::/home/eric:/sbin/nologin
Which shell or program should start at login time is specified in /etc/passwd file? By default, Redhat Enterprise Linux assigns the /bin/bash shell to the users. To deny the interactive login, you should write
/sbin/nologin or /bin/ false instead of login shell.
NEW QUESTION # 46
SIMULATION
Please open the ip_forward, and take effect permanently.
Answer:
Explanation:
See explanation below.
Explanation/Reference:
Explanation:
vim /etc/sysctl.conf net.ipv4.ip_forward = 1
sysctl -w (takes effect immediately)
If no "sysctl.conf" option, use these commands:
sysctl -a |grep net.ipv4
sysctl -P net.ipv4.ip_forward = 1
sysctl -w
NEW QUESTION # 47
The system ldap.example.com provides an LDAP authentication service.
Your system should bind to this service as follows:
The base DN for the authentication service is dc=domain11, dc=example, dc=com LDAP is used to provide both account information and authentication information. The connection should be encrypted using the certificate at http://host.domain11.example.com/pub/domain11.crt When properly configured, ldapuserX should be able to log into your system, but will not have a home directory until you have completed the autofs requirement. Username: ldapuser11 Password: password
Answer:
Explanation:
system-config-authentication LDAP user DN=dc=domain11,dc=example,dc=com Server= host.domain11.example.com Certificate= http://host.domain11.example.com/pub/domain11.crt (enter url carefully, there maybe // or ..) LDAP password OK starting sssd su -ldapuser11 Display Bash prompt #exit
NEW QUESTION # 48
......
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