Files

Question 1

How many vgs each fsvm will host if a home share is created

Answer 1

5 vgs per fsvm

Question 2

what are the DNS records created for files and the reasons for creating then

Answer 2

1. fsname fqdn - contains all the client side ips of the fsvms
2. ntnx-fsvm-x.fqdn - one for each fsvm for dfs referrals
3. ptr records for each fsvm name for nfs

Question 3

what happens when fsname dns record is missing

Answer 3

unable to browse share by name

Question 4

what happens when individual fs VM DNS records go missing

Answer 4

fs root will be accessible but trying to open a share will be stuck for some time and will eventually fail

Question 5

why does share work with ip but not fqdn sometimes

Answer 5

fqdn will invoke Kerberos and ip method will use ntlm as the with method. issues with ad can cause Kerberos auth to fail

Question 6

which daemon speaks to ad in a fsvm

Answer 6

winbind this daemon is used to join a Linux computer to ad and interact with ad

Question 7

which daemon shares a zfs filesystem as SMB share

Answer 7

smbd

Question 8

How to do you list all the users and groups from AD from FSVM

Answer 8

wbinfo -u
wbinfo -g

Question 9

How do you check if an AD user password is correct using FSVM command line

Answer 9

wbinfo -a

Question 10

How to list the forest realm that current fsvm is joined to

Answer 10

sudo net ads info

Question 11

How do you flush winbind cache after you have modified for example preferred dc

Answer 11

sudo net cache flush

Question 12

Why would you use wbinfo -m –online-status command and what will you check in it

Answer 12

Use this command to fine which domains are online as per winbind, you can also see all the domains we have trust with

Question 13

What will you do if a domain is showing offline in wbinfo -m –online-status but the DC is healthy

Answer 13

If the DC is healthy then kill winbind which will re-query the domains and update the status

Question 14

How do you find out the DC we are currently talking to for a domain

Answer 14

sudo wbinfo –getdcname

Question 15

What is the difference between a share that is NFS protocol primary and share that has SMB protocol as primary

Answer 15

SMB primary protocol will have all the files with Windows access control list, NFS primary share will have Linux access control list basically the ACLs change based on the primary protocol of the share

Question 16

How Files translates a Kerberos user to NFS user id

Answer 16

There are two types RFC2307 or Auto RID, RFC2307 is an extension to regular AD and the ID mapping is done by AD server. With Auto RID the files server will do the id mapping