How do Elixir with Mix make a daemon?

Question

Elixir & Mix all want to make the server as a daemon. There have not been able to find the right way.

In addition, I want to use the erlang reltool.

score 10 · Accepted Answer · answered Jun 04 '14 at 14:40

10

You can use the --detached option to start the runtime system detached from the system console. It is meant to be used for running daemons and backgrounds processes:

elixir --detached -S mix run

Regarding reltool, you can use exrm although and pass -detached (single -) when configuring the VM arguments. The full argument list for the runtime system can be found here: http://erlang.org/doc/man/erl.html

answered Jun 04 '14 at 14:40

José Valim

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You don't need to pass `-detached` with exrm, since running your release with `bin/myapp start` automatically runs it in detached mode. – bitwalker Jun 04 '14 at 23:46
but what if the host server get rebooted? Would my elixir app start automatically again? Or do I have to start it manually? – simo Aug 07 '16 at 02:36
@simo, you can use [supervisord](http://supervisord.org/running.html) to ensure that the process is started on reboot – sdc Sep 12 '20 at 17:34

score 2 · Answer 2 · answered Nov 29 '20 at 06:27

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You should use --erl "-detached" since Elixir 1.9+. Like this:

MIX_ENV=prod elixir --erl "-detached" -S mix run --no-halt

or for Phoenix:

MIX_ENV=prod elixir --erl "-detached" -S mix phx.server

answered Nov 29 '20 at 06:27

Mikhail Chuprynski

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where do logs go using these commands? – BSP Nov 02 '21 at 22:07

How do Elixir with Mix make a daemon?

2 Answers2