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Why not? RedHat will let you run arbitrary binaries just fine on OpenShift - both long-running/worker/"PaaS" and on-demand/per-request/"FaaS".

Obviously this is tightly locked down with cgroups.

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How would you modify systemd unit files for each user of your public cloud? How would you manage the sockets once you have more users than sockets on a server?

You can create systemd units using the D-Bus API instead of files, though I'm not sure those can be socket-activated.

As for having more users than sockets, is that really likely, considering there are 64000 available ports?

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