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Following up on this question, it would seem that a server that allocates ports within a namespace would be an obvious and useful capability. One use case for such a service/server would be a collection of co-referential microservers that use each other for tasks. I'd see the usage as:

  • Every microserver that wants to make a port available contacts the port server to register itself by the service name that it provides.
  • Every microserver that wants to use another service asks the port server for the port that corresponds to the service name it wants.

I haven't been able to find anything that does this. Does such a service exist?

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    Are you perhaps thinking of RPC?
    – Jim L.
    Commented Oct 7, 2021 at 19:22
  • Sounds like portmap to me.
    – Kusalananda ♦
    Commented Oct 7, 2021 at 19:28
  • @they I could go for that.
    – Jim L.
    Commented Oct 7, 2021 at 19:29
  • Micro services are often containerised meaning there is rarely a need to allocate ports within a namespace since each micro service runs in its own container and thus its own namespace.
    – Philip Couling
    Commented Oct 7, 2021 at 23:22
  • As an example multiple co-related docker containers can reference each other by host name. Instead of using ephemeral ports each one uses a fixed port on its own (docker) ip address. Containers on the same docker network can resolve the ip of any other container by container name through DNS.
    – Philip Couling
    Commented Oct 7, 2021 at 23:27

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