Connecting cluster with different cookies

Raimo Niskanen raimo+erlang-questions@REDACTED
Thu Aug 12 14:47:23 CEST 2021

I conclude that all these answers seems like the tip of
an iceberg, and that we should keep this functionaliy.

In [PR 5111](, a response
to [Issue #5063](,
I clarify the documentation, extend the functionality,
and clean up the code.

Comments are welcome.

/ Raimo Niskanen

On Mon, Aug 09, 2021 at 06:21:00PM +0200, Raimo Niskanen wrote:
> Hello Community.
> Regarding a GitHub Issue in progress:
> and a corresponding pull request:
> There is an apparently rarely known API call
> erlang:set_cookie(Node, Cookie) that allows you to configure
> a cookie to use when communicating with a different node.
> This/these set cookie/s may/should be different from the node's
> normal (default) cookie, and the functionality exists
> to make it possible to connect nodes that have different
> default cookies.
> The feature is probably rarely used; almost nobody in the
> OTP group knew that it existed nor how it is supposed
> to be used.  Connecting only nodes with the same cookie
> seems to be the norm.
> The question is now, is this an essential feature / how
> important is this feature?
> To completely remove this feature would simplify the code,
> but if that should destroy an important use case; removing
> would not be an option.
> The Issue and PR is about how it is supposed to work; if and
> how it should be fixed.
> So, what says the Community?  How important feature is it
> to be able to connect nodes with different cookies?
> Cheers
> -- 
> / Raimo Niskanen, Erlang/OTP, Ericsson AB


/ Raimo Niskanen, Erlang/OTP, Ericsson AB

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