[erlang-questions] Escript and hidden nodes
Fri Dec 7 09:11:23 CET 2007
Not having tried, I would guess you should use
net_kernel:hidden_connect(Node) instead of using rpc:call()
set up the connection automatically.
2007/12/7, Lev Walkin <>:
> erl has an option flag -hidden:
> Hidden nodes always establish hidden con-
> nections to all other nodes except for nodes in the same global
> group. Hidden connections are not published on neither of the
> connected nodes, i.e. neither of the connected nodes are part of
> the result from nodes/0 on the other node.
> I have a maintenance code which is getting run through escript:
> main(_) ->
> net_kernel:start(['code-update', shortnames]),
> Node = ...
> rpc:call(Node, code, purge, [...]).
> Hovewer, this code causes the remote node to be aware of this
> maintenance script since it is getting reflected in its nodes()
> output. Moreover, the remote node receiving these maintenance
> operations attempts to create a back-channel to this maintenance
> script node, which is undesirable since maintenance script
> might be running on a private NAT'd network and can't receive
> backwards connection from a maintained system.
> My question is how to enable hidden operation of such maintenance
> scripts, either through a command line option to escript or
> some magic parameter to net_kernel:start()?
> Lev Walkin
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