[erlang-questions] Attaching to running release in docker container

Igor Clark <>
Wed Jan 23 00:24:52 CET 2019


Ah ok! Got it. Thanks Tristan.

> On 22 Jan 2019, at 22:59, Tristan Sloughter <> wrote:
> 
> `attach` is only for if you use the `start` (the Dockerfile example you link to uses `foreground`) which runs the release with `run_erl` (see http://erlang.org/doc/man/run_erl.html).
> 
> I would advise against using `start` and thus not using `attach`. I don't think it would even be possible to make work with a docker container and would not be useful even if it could.
> 
> I wish I had removed `start` and `attach` from relx years ago because they cause confusion often and I think are rarely, if ever, needed.
> 
> Maybe it will be done for the next major release of relx and rebar3 :)
> 
> Tristan
> 
>> On Tue, Jan 22, 2019, at 15:11, Igor Clark wrote:
>> Hi folks,
>> 
>> I'm running an R21 release inside a docker container, basically doing what https://github.com/erlang/docker-erlang-example does. (It works great for my app, so thanks for that!)
>> 
>> When I do this:
>> 
>>  docker exec -ti <container> /app/bin/app attach
>> 
>> I get this:
>> 
>> failed to attach, user '' does not have sufficient privileges on '/tmp/erl_pipes//', please run node as a different user
>> 
>> I can run 'remote_console' just fine, and everything else is working as expected too. I've tried hacking it to work by setting ${USER} via the environment (in which case it just says "user 'XX" does not have privileges..."), and even setting all the vars I retrieve via os:getenv() when running under remote_console, but no dice.
>> 
>> When I 'docker exec' with /bin/sh and have a look in /tmp, there's nothing in there at all, as expected, and certainly no 'erl_pipes'. Which I guess might be something to do with the build steps.
>> 
>> Any clues on how to get this working?
>> 
>> Thanks!
>> Igor
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> 
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