We have a few FreeBSD legacy boxes, but everything else is either CentOS 6/7. (20 + VMs, and a few physical)
It’s pretty stable, and everything we need runs on it. Also we decided to standardize on an OS so that there’s no confusion over where to find things.
It looks like Red Hat have introduced much better support for OverlayFS in 7.4, and the CentOS port should be out within 6 weeks.
So I should get it in redhat at work in like 2 years. ^.^;
/me would prefer Illumos Zones over that, by far…
Well I hope the CentOS version comes out by the end of this month - my host currently has no set-up fees for the server I was going to get 
Mainly anything that i can get as the underlying Linux with Alpine docker on top of it.
But same as @OvermindDL1 and @bitwalker, if i had a choice it would be Illumos/SmartOS or FreeBSD. Interestingly, i may be able to slip a bit of Joyent into some new projects at work, so with a bit of hope…
KaOS, since it turned out to be stable as an LTS while rolling.
It is completely focused on Qt/KDE, while nearly each other distro put this stack on top of their GTK stuff, regardless how well that works. It is independent and uses Pacman as its package manager.
My daily driver is Kubuntu 16.04 LTS with root on ZFS (ZoL). I use LXD containers for various development purposes and LXD can exploit ZFS to save disk space. That way I can have different versions of databases etc. running in containers and not litter up my workstation just because I wanted to have a look at or test something. LXD is pretty slick. You can move containers easily between hosts, manage remote containers, push & pull files, and even grab a prompt in a local or remote container without using ssh.
What I use in production really depends on what the needs are and the choice is mostly Linux of some flavor and using LXD on a cloud server you can “push” a container into place from development. If you want to use ZoL in the cloud you’ll most likely have to build/install your own VM for sure but LXD can use Btrfs as easily as ZFS and Btrfs tools can convert an ext4 file system to Btrfs in a pre-installed image, so the choice is yours. Just use the same fs if you want to easily move containers around etc.
Agreed on Illumos based OS. I’m a big fan of ZFS and have been using it in some capacity for 8 yrs or so. When it comes to data retention–snapshots, send & receive can’t be beat. Once you get spoiled by that stuff there’s no going back! 
OmniOS is another Illumos based OS worth having a look at.
I wan’t aware of that. Thanks for the update.
It’s probably still worth considering in certain situations, depending on your needs, especially as a storage system (which is where I had used it mostly).
FreeBSD 11.0 amd64. with the ability to build custom ports it makes shipping the stack we want super easy. The ports tree includes by default an OTP 19.0, OTP 18.0, and a “latest OTP” by default so keeping both a consistent erlang release as well as keeping OS (particularly OpenSSL) patches up to date is pure cake.
I have found recent linux to be an unmanageable dog’s breakfast of random changes that require continual re-tooling just for the sake of it, and getting patches committed to upstream FreeBSD is reasonably straightforward. I don’t recall ever managing to get through Debian’s arcane processes successfully myself.
I summed this up in 2 posts, one personal and another one on the iwantmyname blog hope its interesting reading. Comments and questions welcomed.
