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The correct Systemd solution would be to create a socket unit but your solutions works without modifying the service code

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I can't find anything for an officially supported for Apache or Nginx to support inetd/systemd socket activation bit it certainly would be nice.

I think this requires support from the service, no?

Not everything that wants to open up a port seems to support socket activation. I tried with 6tunnel and couldn't get it to work.

systemd provides a workaround in the form of systemd-socket-proxyd [1]. Granted it copies data, but when the max performance is not required, it works. Sometimes services allow to be configured to listen UNIX socket path, then systemd-socket-proxyd allows to disable ip address access by forwarding the network socket to that.

[1] https://www.freedesktop.org/software/systemd/man/systemd-soc...

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