On Fri, Apr 21, 2023 at 8:34 AM Marc Hoppins via linux-fai <linux-fai@uni-koeln.de> wrote: > > In our 50-host we have > > *-dbnode*) > echo "FAIBASE UBUNTU JAMMY64 WIPEALL BOND JUMBO-DBNODE GRUB_EFI" ;; > > Am confused as to why these are as they are. >
That defines the classes assigned to a host. Which classes are assigned to a host defines which scripts get run, which config files get copied, etc. So yes, it's expected that those class names will appear in a variety of places—attached to different types of files or directories—in the FAI config. If you have an existing interface script which needs to behave similarly, but have some slight variation, depending on some predictable feature of the host, you can approach that in a few different ways. 1) You can run entirely different scripts depending on the classes defined by having slightly different versions of the same script in /srv/fai/scripts/CLASS1/30-interface, /srv/fai/scripts/CLASS2/30-interface, etc. This route might make sense if you have a small number of types of setups, and there is little overlap in the way those setups work. 2) You could do explicit tests in the script for which classes are defined and make relevant choices. 3) You can set up environment variables based on defined classes and use those variables in your scripts I'm probably forgetting other possible approaches. FAI is sometimes frustratingly flexible. :) The hardest part can be picking from the many, many different possible approaches. I use (3) for site-specific configurations. So, as an example: % cat /srv/fai/config/class/SITE_NYC.var DOMAIN="nyc.example.com" GATEWAY_4="192.0.2.1" MASK_4='24' NAMESERVERS_4="192.0.2.53 192.0.2.54" GATEWAY_6="2001:DB8::1" MASK_6='64' NAMESERVERS_6="2001:DB8::53 2001:DB8::54" Every host has one SITE_* class assigned to it, and my network setup script expects to find these environment variables defined. One way you might be able to use this approach for your situation is to have a LINKAGGREGATED class. You could either use that to define some variables (/srv/fai/config/class/LINKAGGREGATED.var), or you could have a test in your 30-interfaces script to see if that class is defined, and have a minor modification to the behaviour of the script in that situation. Which will work better for you depends on the details of your setup, and on how you prefer to work.
