SCA_SLES15 Practice Questions

The option for zypper that will list the available patches is zypper lp. This command will display a

table of patches that are applicable to your system but not yet installed. It will show the patch name,

category, severity, summary, and status for each patch. You can use zypper patch to install all

available patches or zypper patch-info to get more details about a specific patch. Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-zypper.html#sec-zypper-patches

Save a File in Vim / Vi #

The command to save a file in Vim is :w.

To save the file without exiting the editor, switch back to normal mode by pressing Esc, type :w and

hit Enter.

https://linuxize.com/post/how-to-save-file-in-vim-quit-editor/

The w command will save the current file without exiting Vim. It stands for write. The other

commands

are

either

invalid

or

will

exit

Vim

after

saving.

Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-vim.html#sec-vim-save

The /etc/fstab file contains information about file systems that need to be mounted at boot time or

on demand. It specifies the device name, mount point, file system type, mount options, dump

frequency, and fsck order for each file system. Reference: https://documentation.suse.com/sles/15SP3/html/SLES-all/cha-storage-mounting.html#sec-storage-mounting-fstab

You have just added a new directory to be exported via NFS. To make that directory available, you

should run systemctl restart nfsserver.service. This command will restart the NFS server service and

reload

the

/etc/exports

file

that

contains

the

export

definitions.

Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-nfs-server.html#sec-nfs-serverexport

If you have a service named tftp, the command and options that would enable tftp to start

automatically when the server starts are systemctl enable tftp. This command will create symbolic

links in the appropriate systemd target directories to enable the tftp service unit. To start the service

immediately, you can also use systemctl start tftp or systemctl enable --now tftp. Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-systemd-services.html#secsystemd-enable

Log file rotation is the process of compressing or deleting old log files to save disk space and improve

performance. The /etc/logrotate.conf file controls the global settings for log file rotation, such as

frequency,

size

limit,

compression method,

etc.

The

/etc/logrotate.d/

directory

contains

configuration files for specific log files that can override the global settings in /etc/logrotate.conf. The

/usr/sbin/logrotate program is used to perform log file rotation according to the configuration files. It

is

usually

invoked

by

a

cron

job

in

/etc/cron.daily/logrotate.

Reference:

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

By default, the VNC Client and the VNC server daemon use a self-signed SSL certificate for secure

communications. The VNC server generates a self-signed certificate when it is started for the first

time. The VNC Client will prompt the user to accept or reject the certificate when connecting to the

server. Alternatively, the user can provide a custom certificate for the VNC server or disable

encryption if desired. Reference: https://documentation.suse.com/sles/15-SP3/html/SLES-all/secvnc-security.html

To add additional physical volumes to an existing volume group, use the vgextend command. The

vgextend command increases a volume group's capacity by adding one or more free physical

volumes.

https://access.redhat.com/documentation/enus/red_hat_enterprise_linux/4/html/cluster_logical_volume_manager/vg_grow#:~:text=To%20add

%20additional%20physical%20volumes,or%20more%20free%20physical%20volumes.

The command that is used to add new physical volumes to an existing volume group is vgextend. This

command will extend a volume group by adding one or more physical volumes to it. The physical

volumes must be initialized with pvcreate before they can be added to a volume group. Reference:

https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-lvm-vgs.html#sec-lvm-vgs-add-pv

It is false that it is not possible to open more than one file in Vim without running a second instance.

Vim supports multiple buffers, windows, and tabs that allow you to work with multiple files within

one Vim session. You can use various commands and options to open, switch, split, close, and

manipulate

files

in

different

ways.

Reference:

https://documentation.suse.com/sles/15SP3/html/SLES-all/cha-vim.html#sec-vim-multiple-files

The command that will display the value of a variable named TMPDIR is echo TMPDIR.Theechocommandwillprintitsargumentstothestandardoutput.The sign is used to reference the value of a variable in bash. If you omit the $ sign, echo will print the name of the variable instead of its value. If you use single quotes around the variable name, echo will also print the name instead of its value. If you use double quotes around the variable name, echo will print its value as expected. Reference: https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-bash.html#sec-bashvariables