Immutable Software Deploys Using Zfs Jails on Freebsd

I imagine FreeBSD could do something similar if they aren't already. IIRC FreeBSD has a Linux emulation layer (but I don't know how much attention it still gets), and it's had containerization primitives longer than linux, so some amount of filling in the gaps in containerization features and syscall tables (if needed) could possibly yield an OCI compatibility later (for all I know all this already exists).

The problem, and the reason if this doesn't exist why people probably weren't as interested in doing the work, is it would always be "mostly" compatible and working and there would be no guarantee that the underlying software wouldn't exhibit bugs or weird behavior from small behavior differences in the platform when emulating something else. Why open yourself up to the headache when you can just run Linux with containers or build what you want on FreeBSD with jails and their own native containerization primitives.

1: https://www.youtube.com/watch?v=coFIEH3vXPw

You would need to do more work yourself to fetch and run jails probably, and I don't know if there's a hosted repository of 'jail images', but in return, you'd probably have a nicer system (at least, I'd like such a system more than running containers on google container optimized linux)

Docker's killer selling point was that it solved a very common and specific developer problem, not that it provided operational improvements over the state of the art on Linux. From an operational perspective, Docker has generally been a downgrade compared to LXC. (I say this as a maintainer of runc, the container runtime that underpins Docker, and as someone who worked a lot on Docker back in the early days and somewhat less today.)

No it wasn’t. Docker was late to the party even for Linux (and Linux was late compared to every other “UNIX”).

OpenVZ was around for years before docker. Its main issue was that it required out-of-tree kernel code. But there were some distributions that did still ship OpenVZ support. In fact it’s what Proxmox originally used. And it worked very well.

Then LXC came along. Fun fact, Docker was originally used LXC itself. But obviously that was a long time ago too.

I’ve used both OpenVZ and LXC in production systems before Docker came along. But I’ve always preferred FreeBSD Jails + ZFS to anything Linux has offered.

I dislike the implementation but I cannot deny that the UX is good enough to be very popular.