I suddenly came across the term "ephemeral port" in a Linux article that I was reading, but the author did not mention what it is. What is an ephemeral port in UNIX?
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networking - Ephemeral port : What is it and what does it do? - Unix ...
Is there no pre-existing solution for ephemeral users on linux? The second issue might not be as easy to fix, but it would be nice if the test user (or ephemeral user) could actually be restricted from writing to any directory outside of the PREFIX directory created for them. As it stands, they can of course write to anything that gets chmod 777ed.
So if you change the ephemeral port range such that it overlaps with the Mesos port range, it's likely that some arbitrary process will use an ephemeral port that is actually one of those "Mesos ports".
After digging a bit I found that it happens when we or the server (same behavior in both cases) closes the connection with an RST packet and we then reuse the same ephemeral source port shortly after (usually tens of seconds).