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Editorial Team
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Asked: 2026-06-05T19:00:03+00:00

I am trying to implement a really simple example to get a first look

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I am trying to implement a really simple example to get a first look into Distributed Erlang. So, I start two nodes on the same machine:

erl -sname dilbert
erl -sname dogbert

The task is that dogbert makes dilbert output Hello, World! using a simple fun () -> io:format("Hello, World!") end on node dilbert. I thought this would be easy with dogbert‘s shell:

(dogbert@centraldogma.fubar)1> spawn(dilbert, fun () -> io:format("HELLO!") end).
<0.39.0>

=ERROR REPORT==== 13-Jun-2012::17:49:04 ===
** Can not start erlang:apply,[#Fun<erl_eval.20.82930912>,[]] on dilbert **

In the same shell, using nodes(). outputs []. Well, dogbert obviously doesn’t know about dilbert, but why is that the case? Or, how do I make nodes in distributed erlang get to know each other?

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1 Answer

  1. Editorial Team

    There are two problems:

    1. You must set a common cookie for both nodes so they can interact.

      erl -sname dilbert -setcookie pointyhairedboss
      erl -sname dogbert -setcookie pointyhairedboss

    2. You must specify the hostname of the node you want to connect to.
      spawn(‘dogbert@yourhostname’, fun () -> io:format(“HELLO!”) end).

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