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| Section | Objectives |
|---|---|
| Manage basic networking | - Configure hostname resolution - Configure network services to start automatically at boot - Restrict network access using firewalld and firewall-cmd - Configure IPv4 and IPv6 addresses |
| Operate running systems | - Boot systems into different targets manually - Start, stop, and check the status of network services - Manage tuning profiles - Locate and interpret system log files and journals - Securely transfer files between systems - Adjust process scheduling - Interrupt the boot process to gain access to a system - Identify CPU and memory intensive processes and kill processes - Boot, reboot, and shut down a system normally - Preserve system journals |
| Deploy, configure, and maintain systems | - Configure systems to boot into a specific target automatically - Schedule tasks using at, cron, and systemd timer units - Install and update software packages - Modify the system bootloader - Configure time service clients - Start and stop services and configure services to start automatically at boot |
| Understand and use essential tools | - Access a shell prompt and issue commands with correct syntax - Log in and switch users in multi-user targets - Locate, read, and use system documentation - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Access remote systems using SSH - Use grep and regular expressions to analyze text - Create hard and soft links - Use input-output redirection - Create, delete, copy, and move files and directories - Create and edit text files - List, set, and change standard ugo/rwx permissions |
| Create simple shell scripts | - Use looping constructs to process files and command-line input - Process output of shell commands within a script - Process script inputs - Conditionally execute code |
| Create and configure file systems | - Configure autofs - Mount and unmount network file systems using NFS - Diagnose and correct file permission problems - Extend existing logical volumes - Create, mount, unmount, and use VFAT, ext4, and XFS file systems |
| Manage software | - Install and remove Flatpak software packages - Install and remove RPM software packages - Configure access to Flatpak repositories - Configure access to RPM repositories |
| Manage security | - List and identify SELinux file and process contexts - Set enforcing and permissive modes for SELinux - Restore default file contexts - Use Boolean settings to modify SELinux settings - Manage default file permissions - Manage SELinux port labels - Configure key-based authentication for SSH - Configure firewall settings using firewall-cmd and firewalld |
| Configure local storage | - List, create, and delete partitions on GPT disks - Add new partitions, logical volumes, and swap non-destructively - Assign physical volumes to volume groups - Create and delete logical volumes - Configure systems to mount file systems at boot by UUID or label - Create and remove physical volumes |
| 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 |
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NEW QUESTION # 18
Create Logical Volume
According to the given requirements, create a new logical volume:
- Logical volume named "mylv" belonging to the volume group "myvg" with a size of 50 extents.
- Extent size of logical volumes in volume group "myvg" should be 16 MiB.
- Format the new logical volume with the VFAT filesystem.
- The logical volume should be automatically mounted at /mnt/mydata during system startup.
Answer:
Explanation:
Solution:
# Check the disk layout
[root@node2 ~]# lsblk
# Partition the disk
[root@node2 ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.37.4).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n # Add a new partition
Partition type
p primary (1 primary, 0 extended, 3 free) # Primary partition
e extended (container for logical partitions) # Extended partition
Select (default p): p
Partition number (2-4, default 2): # Press Enter
First sector (1026048-20971519, default 1026048): # Press Enter
***Note: The partition size must be larger than the total size, it should not be exactly equal to. It is recommended to add an extra 200M.
Last sector, +/-sectors or +/-size{K,M,G,T,P} (1026048-20971519, default 20971519): +1200M # Partition size
Created a new partition 2 of type 'Linux' and of size 512 MiB.
Command (m for help): w # Save and exit
The partition table has been altered.
Syncing disks.
# Create volume group and logical volume
[root@node2 ~]# vgcreate -s 16M myvg /dev/vdb4
[root@node2 ~]# lvcreate -l 50 -n mylv myvg
# Install vfat support
[root@node2 ~]# yum provides */mkfs.vfat
[root@node2 ~]# yum -y install dosfstools
# Format the logical volume with vfat filesystem
[root@node2 ~]# mkfs.vfat /dev/myvg/mylv
# Create mount point
[root@node2 ~]# mkdir /mnt/mydata
# Update /etc/fstab for automatic mounting
[root@node2 ~]# vim /etc/fstab
/dev/myvg/mylv /mnt/mydata vfat defaults 0 0
# Mount the logical volume
[root@node2 ~]# mount -a
NEW QUESTION # 19
Configure Network Settings
Configure node1 with the following network settings:
Hostname: node1.domain250.example.com
IP address: 172.25.250.100
Subnet mask: 255.255.255.0
Gateway: 172.25.250.254
Answer:
Explanation:
# Connect to servera via console for IP modification, then check using the ip addr command.
# After confirming no issues, SSH to servera for hostname modification. This way, you can copy the hostname to avoid typos.
[root@clear ~] nmcli con show
[root@clear ~] nmcli con mod 'network configuration name' ipv4.method manual ipv4.addresses 172.25.0.25/24 ipv4.gateway 172.25.0.254 ipv4.dns 172.25.0.254 autoconnect yes
[root@clear ~] nmcli con up 'network configuration name'
[root@clear ~] ip a
[root@clear ~] ssh root@172.25.250.100
[root@clear ~] hostnamectl set-hostname red.lab0.example.com
# Verification
[root@node1 ~] ip a //Check if the IP is correct
[root@node1 ~] hostname //Check if the hostname is correct
NEW QUESTION # 20
Part 1 (on Node1 Server)
Task 12 [Accessing Network-Attached Storage]
Configure autofs to automount the home directories of user remoteuserX. Note the following:
utility.domain15.example.com(172.25.15.9), NFS-exports /netdir to your system, where user is remoteuserX where X is your domain number remoteuserX home directory is utility.domain15.example.com:/netdir/remoteuserX remoteuserX home directory should be auto mounted locally at /netdir as /netdir/remoteuserX Home directories must be writable by their users while you are able to login as any of the remoteuserX only home directory that is accessible from your system
Answer:
Explanation:
* *
[root@host ~]#systemctl enable sssd.service
[root@host ~]#systemctl start sssg.service
[root@host ~]#getent passwd remoteuser15
[root@host ~]#yum install autofs
[root@host ~]#vim /etc/auto.master.d/home9.autofs
/netdir/remoteuser15 /etc/auto.home9
[root@host ~]#vim /etc/auto.home9
remoteuser15 -rw,sync utility.network15.example.com:/netdir/remoteuser15/&
[root@host ~]#systemctl enable autofs
[root@host ~]#systemctl restart autofs
[root@host ~]#su - remoteuser15
NEW QUESTION # 21
09. Configure User Account
Configure the user account "manalo" with the user ID 3533. The password for this user should be "flectrag".
Answer:
Explanation:
Solution:
[root@node1 ~]# useradd -u 3533 manalo
[root@node1 ~]# echo flectrag | passwd --stdin manalo
NEW QUESTION # 22
Create a 2G swap partition which take effect automatically at boot-start, and it should not affect the original swap partition.
Answer:
Explanation:
Answer see in the explanation.
Explanation/Reference:
# fdisk /dev/sda
p
(check Partition table)
n
(create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions) Enter
+2G
t
l
W
partx -a /dev/sda
partprobe
mkswap /dev/sda8
Copy UUID
swapon -a
vim /etc/fstab
UUID=XXXXX swap swap defaults 0 0
(swapon -s)
NEW QUESTION # 23
......
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