CODEWITHSUNDEEP
erlang
ForeverConfused
ForeverConfused

Reputation: 1777

How do I start applications by command line as a daemon?

This has been my current routine

sudo nohup erl -sname foo -pa ./ebin -run foo_supervisor shell -noshell -noinput &

where the shell function looks something like this

shell() ->
    {ok, Pid} = supervisor:start_link({local,?MODULE}, ?MODULE, _Arg = []),
    unlink(Pid).

If I don't unlink from shell it immediately stops for some reason. Is there a way I can just start my application like I would normally ie application:start(foo). Also what if I want to start sasl too? Also where could I learn more about making a self contained package using rebar?

Upvotes: 2

Views: 2327

Answers (1)

Roberto Aloi
Roberto Aloi

Reputation: 30995

Preface. About your unlink

In this other SO thread @filippo explains why you need the unlink when testing supervisors from the shell.

First. What you need is an Erlang application.

Reading from the doc:

In OTP, application denotes a component implementing some specific functionality, that can be started and stopped as a unit, and which can be re-used in other systems as well.

Details on how to implement an Erlang application are available here. The three main things you will need to do are:

Second. Starting SASL.

In the above application resource file, you can specify a list of applications you want to start before your application. You will add something like:

...
{applications, [kernel, stdlib, sasl]},
...

To tell it to start SASL.

Third. Rebar.

There's an introduction to Rebar here, which explains you how to use Rebar to help you in the above steps, to pack your brand new application into an Erlang release and how to start it.

Upvotes: 4

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