NFS

Question 1

Diff NFSv3 / NFSv4

Answer 1

NFSv3: TCP + UDP
NFSv4: TCP Only

Question 2

NFS mount modes

Answer 2

1. Manually with mount
2. Persistent at boot with vstab
3. On Demand with an automounter

Question 3

Install nfs client

Answer 3

dnf install nfs-utils

Question 4

Manually mount nfs /shares/public to local /public

Answer 4

mount -t nfs serverb:/shares/public /public

Question 5

Persistently mount nfs /shares/public to local /public

Answer 5

serverb:/shares/public  /public  nfs  rw,sync  0 0

Question 6

What is automounter?

Answer 6

service (autofs) that automatically (un)mounts file systems and NFS exports on demand

Question 7

automounter advantage

Answer 7

1) Auto unmounting protectes from unexpected corruption opening
2) in case of redundant servers, automounter can select the fastest connection each time that a new file system is requested
3) File systems mounted through the automounter are available to all users

Question 8

direct mount

Answer 8

file system mounts to an unchanging, known mount point location

Question 9

Indirect moint

Answer 9

mount point location is not known until the mount demand occurs (e.g. remote-mounted home directories)

Question 10

Install automounter

Answer 10

sudo dnf install autofs nfs-utils

Question 11

Use of master map file

Answer 11

1) identifies the base directory for mount points,
2) identifies the mapping file to create the automounts.

Question 12

Where are the master map files located

Answer 12

/etc/auto.master.d

Question 13

Extension of the master map file?

Answer 13

.autofs

Question 14

Content of master map file for indirect mapping

Answer 14

/shares. /etc/auto.demo

Question 15

Fully qualified path of the mount point

Answer 15

Master map mount point + Mapping file mount point

Question 16

Example content of an indirect mapping file

Answer 16

work   -rw,sync  servera:/shares/work

Question 17

Formating rules for mount options

Answer 17

1. start with dash
2. Comma separated
3. No white space

Question 18

Mapping file content when NFS server exports many directories

Answer 18

*    -rw,sync   serverb:/shares/&

Question 19

Autom master config for direct map

Answer 19

/-  /etc/auto.direct

Question 20

What is the key difference between indirect and direct mapping file content

Answer 20

Mount point in direct mapping case must be absolute

Question 21

Options for map files with nfs4 file system

Answer 21

-rw,sync,fstype=nfs4

Question 22

After each change of fstab what should you not forget?

Answer 22

systemctl daemon-reload