Static and System Mount Information

Question 1

Which three files manage mounted filesystems in Linux?

Answer 1

/proc/mounts, /etc/mtab, /etc/fstab

Question 2

What does /proc/mounts show?

Answer 2

Real-time mounted devices from the kernel

Question 3

Is /proc/mounts editable by users?

Answer 3

No, it is read-only

Question 4

What command displays /proc/mounts?

Answer 4

cat /proc/mounts

Question 5

Example output of /proc/mounts?

Answer 5

/dev/sda1 / ext4 rw,relatime,data=ordered 0 0

Question 6

What does /dev/sda1 represent in /proc/mounts?

Answer 6

Block device

Question 7

What does / represent in /proc/mounts?

Answer 7

Mount point

Question 8

What does ext4 represent?

Answer 8

Filesystem type

Question 9

What does rw indicate?

Answer 9

Read-write access

Question 10

What does relatime mean?

Answer 10

Updates access times on reads

Question 11

What does data=ordered mean?

Answer 11

Journaling option

Question 12

What do 0 0 at the end mean?

Answer 12

Not backed up by dump, no fsck at boot

Question 13

What is /etc/mtab used for?

Answer 13

Lists mounted devices as tracked by user-space tools

Question 14

Is /etc/mtab historically writable?

Answer 14

Yes, but now often linked to /proc/self/mounts

Question 15

What command displays /etc/mtab?

Answer 15

cat /etc/mtab

Question 16

What does /etc/fstab define?

Answer 16

Static mount points for automatic mounting

Question 17

How many fields does each /etc/fstab entry have?

Answer 17

Six fields: block device, mount point, filesystem type, mount options, dump setting, fsck order

Question 18

What command mounts all /etc/fstab entries?

Answer 18

mount -a

Question 19

Example /etc/fstab entry?

Answer 19

/dev/sdb1 /mnt/data ext4 defaults 0 2