[erlang-questions] Docker enviroment variables in releases ?

[Dmitry Kolesnikov]

Hello,

I’ve built a simple wrapper over application:env and os:get_env for this type of purpose. 
https://github.com/fogfish/feta/blob/master/src/opts.erl

In sys.config you define
```
{myapp, [
   {port, {env, "CONFIG_MYAPP_PORT", "8080”}}
...
```

In erlang code:
```
Port = opts:val(port, myapp)
```
Then this function would check value of CONFIG_MYAPP_PORT variable and return it. The default value is return if env is not defined.

If any one finds this feature useful for other projects, I can think of evolving this feature further on. 

Best Regards,
Dmitry

> On 2 Mar 2019, at 10.49, Thomas Elsgaard <thomas.elsgaard@REDACTED> wrote:
> 
> Hi list!
> 
> Any good solutions for using Docker enviroment variables in an Erlang release running i Docker ?
> 
> Like it would be really cool to override default sys.config settings when starting the container with -e SOME_SYS_CONFIG_SETTING=1234
> 
> Thomas
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