Linux Config Files

Question 1

Where do you go to modify DNS server

Answer 1

/etc/resolv.conf

Question 2

Where is the hosts file

Answer 2

/etc/hosts

Question 3

Where is your personal profile file

Answer 3

/home/USERNAME/.profile

Question 4

Where do you go to change your umask value

Answer 4

edit the file /home/USERNAME/.profile

Question 5

Where would you find the grub config pointer file

Answer 5

/boot/efi/EFI/grub.cfg

File can be in many places
BIOS: boot/grub/grub.cfg
UEFI: boot/efi/EFI/DISTRO/grub.cfg

Question 6

Where would you find boot logging?

Answer 6

dmesg
Or
syslog/journalctl
A Rhel env might use msg

Question 7

How would you find out what’s slowing the boot process?

Answer 7

sudo systemd-analyze blame

Question 8

How would you view all the system ‘tuneables’?

Answer 8

sysctl -a

Question 9

What is nmcli?

Answer 9

Network Manager Command Line Interface

Question 10

How would you modify the initrd file and create a new initrdRAM (after installing new hardware required by boot process)

Answer 10

mkinitrd on RHEL
mkinitramfs on Deb

Question 11

How to view Xorg error log

Answer 11

journalctl /usr/bin/Xorg

Question 12

Where would the Xorg configuration file be (only there if it’s got issues) (2 places)

Answer 12

/etc/x11/Xorg.conf

Otherwise try
/usr/share/X11/xorg.conf.d/

Question 13

How to access ntp configuration?

Answer 13

Sudoedit etc/ntp.conf