Umbrella app distillery release dockerised but crashing out

Questions / Help
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1

Hello everyone, please can anyone help? I have an umbrella app, which has some Phoenix apps inside the apps folder. The frontend and the api backend. When I use distillery and docker to make a build and then a release, I run the docker container, it fires up. It starts the ejabberd server which I have embedded inside the api backend umbrella app. However one of the Phoenix apps dinarly-api crashes out when I run the docker container and says the following message…

=CRASH REPORT==== 30-Jul-2018::15:19:31 ===
  crasher:
    initial call: application_master:init/4
    pid: <0.2518.0>
    registered_name: []
    exception exit: {bad_return,
                        {{'Elixir.DinarlyApi.Application',start,[normal,[]]},
                         {'EXIT',
                             {undef,
                                 [{'Elixir.DinarlyApi.Application',start,
                                      [normal,[]],
                                      []},
                                  {application_master,start_it_old,4,
                                      [{file,"application_master.erl"},
                                       {line,273}]}]}}}}
      in function  application_master:init/4 (application_master.erl, line 134)
    ancestors: [<0.2517.0>]
    message_queue_len: 1
    messages: [{'EXIT',<0.2519.0>,normal}]
    links: [<0.2517.0>,<0.1885.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 376
    stack_size: 27
    reductions: 201
  neighbours:
15:19:31.678 [info] Application dinarly_api exited: exited in: DinarlyApi.Application.start(:normal, [])
    ** (EXIT) an exception was raised:
        ** (UndefinedFunctionError) function DinarlyApi.Application.start/2 is undefined (module DinarlyApi.Application is not available)
            DinarlyApi.Application.start(:normal, [])
            (kernel) application_master.erl:273: :application_master.start_it_old/4
15:19:31.694 [info] Stop accepting TCP connections at 0.0.0.0:5222 for ejabberd_c2s
15:19:31.694 [info] Stop accepting TCP connections at 0.0.0.0:5269 for ejabberd_s2s_in
15:19:31.695 [info] Stop accepting TCP connections at 0.0.0.0:5280 for ejabberd_http
15:19:31.712 [info] ejabberd 18.6.0 is stopped in the node 'dinarly@127.0.0.1'
[os_mon] memory supervisor port (memsup): Erlang has closed
[os_mon] cpu supervisor port (cpu_sup): Erlang has closed
{"Kernel pid terminated",application_controller,"{application_start_failure,dinarly_api,{bad_return,{{'Elixir.DinarlyApi.Application',start,[normal,[]]},{'EXIT',{undef,[{'Elixir.DinarlyApi.Application',start,[normal,[]],[]},{application_master,start_it_old,4,[{file,\"application_master.erl\"},{line,273}]}]}}}}}"}
Kernel pid terminated (application_controller) ({application_start_failure,dinarly_api,{bad_return,{{'Elixir.DinarlyApi.Application',start,[normal,[]]},{'EXIT',{undef,[{'Elixir.DinarlyApi.Application'

Crash dump is being written to: erl_crash.dump...done

Although, the release works fine on my Linux desktop and MacBook Pro. Just when I dockerise this release it won’t fire up properly. It’s the Phoenix app in particular which it says that Application.start/2 is undefined. I have Googled this over the past few days in the evenings but have not managed to solve it yet!

2

Can you show your dockerfile? That might provide more information for someone to solve this.

3

Sure thing, my two Dockerfiles which are for the build and the release are as follows:

Dockerfile.build

FROM elixir:1.6.5

ENV HOME=/opt/app/ TERM=xterm

RUN mix local.hex --force && \
    mix local.rebar --force

WORKDIR /opt/app
ENV MIX_ENV=prod REPLACE_OS_VARS=true

COPY config/ $HOME/config/
COPY rel/config.exs $HOME/rel/
COPY mix.exs mix.lock ./
COPY apps/dinarly_api/mix.exs $HOME/apps/dinarly_api/
COPY apps/dinarly_api/config/ $HOME/apps/dinarly_api/config/
COPY apps/dinarly_armory_frontend/mix.exs $HOME/apps/dinarly_armory_frontend/
COPY apps/dinarly_armory_frontend/config/ $HOME/apps/dinarly_armory_frontend/config/
COPY apps/dinarly_fikrly_frontend/mix.exs $HOME/apps/dinarly_fikrly_frontend/
COPY apps/dinarly_fikrly_frontend/config/ $HOME/apps/dinarly_fikrly_frontend/config/
RUN mix deps.get
COPY config ./config
RUN mix deps.compile

RUN MIX_ENV=prod mix release --env=prod  --verbose

Dockerfile.release

FROM elixir:1.6.5

EXPOSE 4000
EXPOSE 4001
EXPOSE 5000
EXPOSE 5222
EXPOSE 5269
EXPOSE 5280

ENV MIX_ENV=prod REPLACE_OS_VARS=true SHELL=/bin/bash

WORKDIR /dinarly
COPY ./dinarly.tar.gz ./
RUN tar xfz dinarly.tar.gz

ENTRYPOINT ["bin/dinarly"]
4

The thing I find strange is that basically the Docker containers build fine, the build and the release, both build okay. The distillery release works fine also outside of Docker. So I am thinking it might be something to do with the Docker container itself. Maybe I need to change that Docker release file?

5

I have solved this issue now!

I needed to add the following to the bottom of my Docker.release file:

CMD ["foreground"]
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