Chris's Wiki :: blog/sysadmin/OurGrowingUnixMonoculture
Once upon a time, we ran Ubuntu Linux machines, OpenBSD machines, x86 Solaris machines, and what was then RHEL machines (in the days of our first generation ZFS fileservers). Over time, Solaris changed to OmniOS (and RHEL to CentOS), but even at the time it was clear that both of those hadn't caught on here and after a while we replaced the OmniOS fileservers and CentOS iSCSI backends with our third generation Ubuntu-based fileservers. Then recently, the final pieces of CentOS have been getting removed, such as our central syslog servers because CentOS as it originally was is dead (the current 'CentOS Stream' doesn't meet our needs).
Our OpenBSD usage has also been dwindling. Originally we used OpenBSD for firewalls, most DNS service, a DHCP server, and several VPN servers (for different VPN protocols). Our internal DNS resolvers now run Bind on Ubuntu and we've been expecting to some day have to move our VPN servers away from OpenBSD in order to get more up to date versions of the various VPNs (although this hasn't happened yet). The OpenBSD DHCP server is fine so far, but we have three DHCP servers and two of them are Ubuntu machines, so I wouldn't be surprised if we switch the third to Ubuntu as well when we next rebuild it.
(There's basically no prospect of us switching away from OpenBSD on the firewalls, but the firewalls are effectively appliances.)
