Running a number of production services on-premise on a big machine using native zones, a few using LX zones (the built-in Linux compatibilty layer), and a single bhyve zone. Actually, years ago this machine was the very first server we set up when our company was just getting started and for the first few years it ran pretty much everything. Zones were ideal for that, also to allow us to pack more services on less hardware, while having decent separation and everything snapshotting/backupping using ZFS. Nowadays we have a bunch more servers, with varying *nix operating systems (SmartOS, Debian, FreeBSD), as well as macOS and even Windows for some specific CI functions. (:

The global zone works great as a hypervisor if you prefer working over SSH in a real shell, and being able to run a lot of services natively just makes things like memory allocation to VM's and having a birds eye view of performance easier. Being able to CoW cp/mv files between zones because it's actually the same filesystem makes certain operations much easier than with actual VM's. Bhyve works well for the things that need an actual Linux kernel or other OS, at the cost of losing some of the zone benefits mentioned earlier.

Highlighting a few things we today run on SmartOS, grouped by their technology stacks: C (haproxy, nginx, PostgreSQL, MariaDB), PHP (various web apps), Java (Keycloak), Elixir/Phoenix (Plausible, fork of Firezone), Rust (rathole, some internal glue services), Go (Grafana, Consul, Prometheus). Most of those are readily available in the package manager, and a few offer native Solaris binaries which run fine on illumos. Others we do local builds in a utility zone before copying the binary package to the where it actually runs.

On LX zones we also run a number of services without problems, usually because they have Debian packaging available but are not in pkgsrc (for example Consul/Nomad, Fabio, some internal things that was already Linux-specific and we haven't bothered to port yet).

And at home a LX zone also runs Jellyfin just fine. (:

Home stuff was the last holdout for me, but even that has been replaced by Proxmox these days. I used SmartOS for a solid 7-8 years, though, and like it for most of that time.

I couldn't point to any one single major reason that prompted the switch - just lots of small annoyances stemming from the world expecting you to be running Linux instead of Solaris, and once you move away from zones, you lose one of the most compelling reasons for being on SmartOS

Certainly Oxide computer company has some use of illumos still, which is strongly related to SmartOS

I use it. It's not the most practical I'll admit but I like the simplicity (I'm not super experienced with linux server administration so both of them feel similarly foreign, but SmartOS is pretty minimal and has been pretty straightforward to manage), and I won't lie it's a fun gimmick to be running a descendant of SunOS for random household services.

It was acquired by Samsung, which is notoriously bad at open source. But the reason why it quietly faded into the background wasn't that. It was that Joyent's ex Sun people had an annoying elitism that made them not care about working with the community.

I have a personal box I keep updated running some utility zones and a couple VMs. I enjoy the tooling very much but it's so niche that I'm wary of using it for Customer engagements.

I never used Solaris in my real life but I can understand the appeal for people who did.

I think the big hit on Solaris and FreeBSD popularity since then was OpenZFS adopting Linux as their main reference operating system.

I use it for a home server. Zones provides a secure way to have (on one physical machine with one physical network interface) some stuff you can only get to on the local network and some things you can get to over the public internet and some things via internet if you have the right ssh key. Each contained natively from each other. Crossbow firewall provides a nice way to contain traffic securely as well. ZFS let me set up two big external usb drives as a raid array, the resulting zvol can (iirc) have multiple filesystems for use by multiple zones although I only use it from one right now for the lan only zone. That zone shares via SMB to my network so I can use it for backups and media streaming.

I’ve been able to do almost everything in native zones. I had a bhyve zone set up to run a photo related GitHub code base that really needed Linux.

SMF is a joy to use for services and package management with pkgsrc is great. The whole thing just feels very thoughtfully put together.

You can probably achieve all this on Linux with docker and the right iptables (or whatever succeeded it) config I imagine? But on smartos I am using facilities that are integrated deeply into the os going back like 20 years now. I also just prefer the old sun stuff.