Upgrading pxelinux and nfsroot

[CSCI Technician]

Hi,

I'm very new to FAI and have been doing my best to learn via the 
documentation and the little I can find online however I'm stuck...

I have inherited a FAI setup running on Stretch and configured to deploy 
Stretch to various clients.  I have no documentation from the previous 
person so I'm treading lightly.  The FAI version was 5.3.6 but I have 
upgraded it to 5.8.4~bpo9+2 by adding the FAI repo to sources.list and 
updating.

I have not run any FAI specific commands yet to update anything else as 
I'm unsure as to what options, or commands, to use.
I don't want to change the ssh keys, the passwords, or anything else 
that was originally set up using fai-setup and fai-make-nfsroot.

I know I need to update the version of pxelinux used as it will not work 
on my new Dell machines.  I have no idea how to do this... perhaps 
"fai-setup -e"? What can this break?

I'm not sure if I need to or should rebuild the nfsroot and if so, what 
options do I use. Perhaps "fai-make-nfsroot -kv"? What can this break?

Any assistance or pointers to websites would be appreciated.  I believe 
I've been through all the online docs and wiki and mailing list archives 
but I may have missed something.

Cheers,
Merlin

-- 
Merlin Hansen
Department of Computing Science
Vancouver Island University
900 Fifth Street
Nanaimo BC  V9R 5S5
250-753-3245 x 2321
tech at csci.viu.ca