alt Hacker NewsI find it a bit odd that they seem to have gone from having OpenBSD as the standard and are not moving to FreeBSD and Ubuntu.
I an not sure what role these computers that may transition to Ubuntu do, there are probably good reasons, I wish he had expanded on it.
The computers that moved from OpenBSD to Ubuntu were our local resolving DNS servers. These don't use PF and we also wanted to switch from our previous OpenBSD setup to Bind, where we were already running Bind on Ubuntu for our DNS master servers. The gory details were written up here: https://utcc.utoronto.ca/~cks/space/blog/sysadmin/UsingBindN...
We may at some point switch our remaining OpenBSD DHCP server to Ubuntu (instead of to FreeBSD); like our DNS resolvers, it doesn't use PF, and we already operate a couple of Ubuntu DHCP servers. In general Ubuntu is our default choice for a Unix OS because we already run a lot of Ubuntu servers. But we have lots of PF firewall rules and no interest in trying to convert them to Linux firewall rules, so anything significant involving them is a natural environment for FreeBSD.
(I'm the author of the linked-to article.)