[erlang-questions] inet configuration vs. name and sname

Felix Gallo <>
Wed Aug 31 07:25:20 CEST 2016


Hi Gleb --

1.  yes, I know gethostname(3) somehow snuck in there despite my best
efforts.  The documentation suggested strongly that it wouldn't, though.

I hadn't tried -name '' yet and to my surprise that does
seem to work.  That'll work for what I need; thanks!

F.


On Tue, Aug 30, 2016 at 9:49 PM, Gleb Vinogradov <>
wrote:

> Hi Felix
>
> 1.  part is just result of calling command 'hostname'.
> 2. Have you tried erl -name  ?
>
> Gleb
>
> 2016-08-31 11:13 GMT+07:00 Felix Gallo <>:
>
>> I would like to force my node's name to be in IPV4 format, e.g., '
>> ", rather than any hostname-related nameserved alternative.
>> I would expect this to be possible, because erlang frequently operates in
>> constrained environments and embedded environments where DNS is a luxury,
>> etc., etc.
>>
>> Reading http://erlang.org/doc/apps/erts/inet_cfg.html I get the strong
>> impression that this is further supposed to be possible.  For example, one
>> might construct an inet_config file that looks like this:
>>
>> %% erlang inetrc
>> {resolv_conf, ""}. %% do not use a resolv.conf file.
>> {file, hosts, "/dev/null"}.  %% use a null hosts file.  Note: "" throws
>> weird error.
>> {hosts_file, ""}. %% further, don't keep tabs on that hosts file.
>> {cache_size, 0}. %% never care what happens with DNS caching.
>> {lookup, [file]}.  %% only look up hostnames through the empty hosts
>> file; no dns, no native.
>> clear_hosts.  %%  No hosts.  Are we clear on this erlang?  Are we?
>> clear_ns. %% No nameservers.  None!  You cannot look up names.
>> clear_search.  %% No search domain.
>>
>> and yet,
>>
>> $ erl -kernel inetrc '"./erl_inetrc"' -name mynode
>> Erlang/OTP 19 [erts-8.0] [source-6dc93c1] [64-bit] [smp:4:4]
>> [async-threads:10] [hipe] [kernel-poll:false]
>>
>> Eshell V8.0  (abort with ^G)
>> ()1> inet:get_rc().
>> [{domain,"att.net"},
>>  {resolv_conf,[]},
>>  {hosts_file,[]},
>>  {cache_size,0},
>>  {lookup,[file]}]
>>
>> note that the name of the machine ('spatula') and domain ('att.net')
>> have nevertheless been found out; and
>>
>> $ erl -kernel inetrc '"./erl_inetrc"' -sname mynode
>> Erlang/OTP 19 [erts-8.0] [source-6dc93c1] [64-bit] [smp:4:4]
>> [async-threads:10] [hipe] [kernel-poll:false]
>>
>> Eshell V8.0  (abort with ^G)
>> ()1> inet:get_rc().
>> [{resolv_conf,[]},
>>  {hosts_file,[]},
>>  {cache_size,0},
>>  {lookup,[file]}]
>>
>> This makes me sad.  Am I missing something or is it not possible to force
>> the  part of a node's name to be simply dotted quads?
>>
>> F.
>>
>> _______________________________________________
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>> 
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>>
>
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