global singleton gen_server

Roberto Ostinelli ostinelli@REDACTED
Thu Dec 16 12:00:36 CET 2021

Dear all,
I'm trying to run an operation only once on cluster start but there's
clearly something that I'm missing in the global module (see other related
question here [1]).

Therefore this time I'm trying to have a single global gen_server which I
start directly from application start/2 callback with:
gen_server:start_link({global, ?MODULE}, ?MODULE, [], Options).

Nodes are already connected at that point (I can see them with nodes()),
however for some reason this registration works on all the nodes and I find
myself with multiple gen_server registered globally.

What is the proper way to register a global singleton gen_server at cluster
level on application start? mY need is to run an operation only _once_ a
cluster boots up.

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