[erlang-questions] Escript and hidden nodes
Fri Dec 7 09:23:55 CET 2007
Ulf, there's no net_kernel:hidden_connect() in the
net_kernel manual page. Moreover, the source code
lists hidden_connect() and hidden_connect_node()
as two possible variants, both exported. Which
one do you recommend?
Ulf Wiger wrote:
> Not having tried, I would guess you should use
> net_kernel:hidden_connect(Node) instead of using rpc:call()
> set up the connection automatically.
> Ulf W
> 2007/12/7, Lev Walkin <vlm@REDACTED>:
>> 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
>> erlang-questions mailing list
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