[erlang-questions] Escript and hidden nodes

Ulf Wiger <>
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.

BR,
Ulf W

2007/12/7, Lev Walkin <>:
>
> Hi,
>
> 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:
>
>         #!/usr/local/bin/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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