systemd introduced Portable Services support in 2018, as part of v239. This feature was covered at ASG 2018 and in a blog post published at the time: https://0pointer.net/blog/walkthrough-for-portable-services.html
But a lot has changed in the past 6 years, and very crucial new features have been introduced, so it is time to have another look at this topic and see what has happened in the meanwhile, what new use cases have opened up, and what is coming in the near future.
https://systemd.io/PORTABLE_SERVICES/
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