Archiving & Tuning

Question 1

Archive folder /etc using tar and gz

Answer 1

tar cfz etc.tar.gz /etc

Question 2

Archive folder /etc using tar and bz2

Answer 2

tar cfj etc.tar.bz2 /etc

Question 3

Archive folder /etc using tar and xz

Answer 3

tar cfJ etc.tar.xz /etc

Question 4

List the content of a tar file

Answer 4

tar tf etc.tar (t for test)

Question 5

Extract tar file to a specified target directory

Answer 5

tar xf etc.tar -C etc-backup

Question 6

What recommended ways to copy files to remote servers rsync or scp?

Answer 6

rsync or sftp
scp is insecure

Question 7

You are in sftp. What commands are used to navigate local file system?

Answer 7

lpwd, lcd, lls, lmkdir

Question 8

In sftpt download a directory and its full content

Answer 8

get -r dir

Question 9

Copy dirA to serverA

Answer 9

rsync -av dirA servera:

Question 10

Diff between:

rsync -a dirA   dirB

rsync -a dirA/   dirB

Answer 10

First copies the folder dirA. Second copies the content of dirA

Question 11

What is the name of the perf tuning daemon?

Answer 11

tuned

Question 12

What command do you use to interface with the perf tuning daemon

Answer 12

tuned-adm

Question 13

Install perf tuning daemon

Answer 13

dnf install tuned

Question 14

Determine currently active tuning profile

Answer 14

tuned-adm active

Question 15

Show all perf tuning profile

Answer 15

tuned-adm list

Question 16

What are some tuning profiles

Answer 16

aws
virtual-guest
virtual-host
balanced
powersave
desktop

Question 17

Activate profile balanced

Answer 17

tuned-adm profile balanced

Question 18

Where are perf tuning profiles stored?

Answer 18

/usr/lib/tuned

Question 19

Create a custom tuning profile

Answer 19

cp /usr/lib/tuned/balanced/tuned.conf    /etc/tuned/custom/tuned.conf

tuned-adm profile custom

Question 20

What are the sections of a tuning profile

Answer 20

main, sysctl

Question 21

What are some fields of a tuning profile

Answer 21

summary
include (to inclue another profile)

Question 22

Check if the perf daemon is installled

Answer 22

dnf list tuned

Question 23

Copy file from sftp server in one single command

Answer 23

sftp remoteuser@remotehost:/home/remoteuser/remotefile

Question 24

rsync dry run option

Answer 24

-n

Question 25

rsync option to preserve hard links

Answer 25

-H

Question 26

rsync option to preserve selinux context

Answer 26

-X

Question 27

rsync option to preserve ACL

Answer 27

-A

Question 28

When running rsync what do you do to preserve ownerships

Answer 28

You must be the root user on the destination system to preserve file ownership.

Question 29

Static tuning

Answer 29

the tuned daemon applies settings when a service starts or when the profile is selected. never based on realtime activities.

Question 30

dynamic tuning

Answer 30

tuned daemon monitors system activity and adjusts settings according to runtime behavior changes

Question 31

monitor and tuning plug-ins

Answer 31

monitor and adjust parameter settings

Question 32

Default monitor plugins

Answer 32

disk, net, load

Question 33

Default tuning plugins

Answer 33

disk, net, cpu

Question 34

dynamic tuning default state

Answer 34

disabled

Question 35

How do you disable/enable dynamic tuning

Answer 35

set dynamic_tuning to 1 in /etc/tuned/tuned-main.conf

Question 36

Show info about a tuning profie

Answer 36

tuned-adm profile_info balanced

Question 37

Determine the most suitable profile for the system at this exact time

Answer 37

tuned-adm recommend

Question 38

Check the value of vm.dirty_ratio

Answer 38

sysctl vm.dirty_ratio