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Erlang/Elixir release start vs foreground

#deployment#releases
jeroenbourgois

jeroenbourgois

Erlang/Elixir release start vs foreground

Hi!

I wonder if somebody could provide me with some insights on the difference between APP/bin/APP start and APP/bin/APP foreground, apart from the obvious (daemon like behaviour vs direct output).

We have some strange behaviour in our app when ran with ‘start’ (from using edeliver) rather than with foreground. More specific, we have some tasks running with Quantum and when using start they are registered and run multiple times (typically twice) and they also use old stale code (an outdated Ecto schema). When starting the app with foreground everything runs fine.

For now we only see this behaviour on our staging server, but since staging and prod are almost identical we are stressing deploying to production.

9 comments
#deployment#releases
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Marked As Solved

tristan

tristan

Rebar3 Core Team

Right. Using start should only be when the user discovers they need some of the run_erl functionality http://erlang.org/doc/man/run_erl.html

1
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tristan

tristan

Rebar3 Core Team

While unrelated to your issue here I figured I should include the usual rant about start and the differences from foreground:

start is poorly named. With the new release functionality being added to mix this is luckily fixed, Jose has named it daemon instead of start.

The daemon created by start will fsync on every log line written which can become a bottleneck. Unless you really need the functionality of a pipe you can attach to I advise against ever using it.

Eventually rebar3 and relx will rename it, this hasn’t been done simply for backwards compatibility that goes back to the original rebar reltool scripts. Hopefully distillery will also rename it.

5
Post #5
jeroenbourgois

jeroenbourgois

Ok found it. There was some rogue old VPS running the app (not really rogue, but that makes my mistake sound less bad :wink: ).

No issue at all!

1
Post #4
jeroenbourgois

jeroenbourgois

Interesting! So it is better to just run releases using foreground?

1
Post #6

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