https://documentation.suse.com/sles/12-SP4/html/SLES-all/cha-grub2.html

To

add

two

new

custom

items

to

the

GRUB2

boot

menu,

you

should

modify

the

/boot/grub2/custom.cfg file. This file can contain custom menu entries that will be added to the end

of the GRUB2 menu. The syntax and format of this file are similar to /boot/grub2/grub.cfg file. You do

not

need

to

run

grub2-mkconfig

after

modifying

this

file.

Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-grub2-custom.html

https://en.wikipedia.org/wiki/Virtual_Network_Computing#:~:text=VNC%20by%20default%20uses

%20TCP,Java%2Denabled%20web%2Dbrowser.

VNC by default uses TCP port 5900+N,[6][7] where N is the display number (usually :0 for a physical

display). Several implementations also start a basic HTTP server on port 5800+N to provide a VNC

viewer as a Java applet, allowing easy connection through any Java-enabled web-browser. Different

port assignments can be used as long as both client and server are configured accordingly. A HTML5

VNC client implementation for modern browsers (no plugins required) exists too.[8]

The default port a VNC Client uses to connect is TCP 5901. This port corresponds to the first display

number (:1) of the VNC server. Each display number has its own port number, starting from 5900. For

example, display :2 uses port 5902, display :3 uses port 5903, and so on. The user can specify a

different

port

number

if

needed.

Reference:

https://documentation.suse.com/sles/15SP3/html/SLES-all/sec-vnc-connect.html

The -U option will install a package whether or not a previous version of the package is already

installed. If a previous version exists, it will be upgraded. The -F option will install a package only if a

previous version of the package is already installed. It will not install a new package. Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-sw-cl.html#sec-rpm-commands

The screen command will allow you to create and manage multiple terminal sessions that can be

detached and resumed later. You can use the screen command to start a new session, then detach it

with

Ctrl-a

d,

and

reattach

it

from

another

location

with

screen

-r.

Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-screen.html

If you are setting up a SLES 15 server that will require very large data volumes and journaling

capabilities, the best choice for your data volumes is XFS. XFS is a high-performance and scalable file

system that supports large files and file systems, online defragmentation and resizing, metadata

checksums, and other features. XFS also provides journaling capabilities that ensure data consistency

and integrity in case of system crashes or power failures. XFS is the default file system for data

partitions in SLES 15. Reference: https://documentation.suse.com/sles/15-SP3/html/SLES-all/chafilesystems.html#sec-filesystems-xfs