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Comment by pjmlp | Hacker News Reader

> z/OS Container Extensions provides the capability to run Linux on IBM Z softwaredirectly in z/OS. This capability enables Linux on Z application code to run on z/OSunmodified.

Instead of POSIX, we now just ship a whole OS instead as a kind of "modern" VM, given the trend to run Linux on VM across Windows, Solaris, IBM and Unisys mainframes, FreeBSD, macOS, SmartOS some of them are even certified UNIX platforms.

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> Instead of POSIX, we now just ship a whole OS instead

Well, we have been saying "composition over inheritance" for quite a while... :)

Turns out, an OS that has-a POSIX is often nicer than one that is-a POSIX.

But then some OS can both have and be POSIX. It’s POSIX all the way down!

That’s kinda interesting in a WSL sort of way.

Last time I played with System Z machines you’d run z/Linux either direct on an LPAR or under z/VM (IIRC).

Given just how partitionable these machines are, I’m honestly not sure why you’d want to run Linux applications directly on z/OS...

I suppose if the pressure to minimize cost is really high, it could be an attractive option for shops that want to take a stab at incrementally replacing COBOL with something that runs on Linux.

Well, the last SuS/POSIX came out in 2008. It's 2021.

It should come as no surprise that since Linux has become the defacto POSIX standard that no other OS could keep up (or would want to really).

The last POSIX came out in 2017, and it's a constantly evolving standard. It's also widely supported and Linux isn't even the most standards compliant.

Thank you for the info. I was completely in the dark about that. I thought 2008.3 was the last.

As for Linux' standards compliance, I am aware.

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