Hi Dan

Attempting to answer question 2, the most recent version of elixir adds 
runtime.exs to replace/improve on releases.exs which runs at boot of an Elixir 
app from mix or a release, see 
https://hexdocs.pm/elixir/Config.html#module-config-runtime-exs

Cheers
Jon

On Fri, 24 Sep 2021, at 10:39 AM, Dan Calancea wrote:
> Let's suppose we have a elixir service that spawns some workers to do a job, 
> the supervisor takes configuration from config and starts the workers. Now 
> the classic way to configure such a project in prod is to use *releases.exs*, 
> where you can configure environment variables and the release will reload the 
> configuration*.*
> **
> What I want to implement now is a dashboard that will control multiple 
> services configuration, this means that there should be a centralized storage 
> for configuration and some kind of signaling when to change configuration.
> 
> Let's suppose we use postgres, some tables to store the configuration and 
> custom signaling/ postgres NOTIFY to notify that the configuration has 
> changed and needs to be reloaded.
> 
> The questions that arise are:
>  1. Is it possible/recommended to change the *releases.exs *file responsible 
> for configuration in a release so that the new configuration is persisted 
> across reloads?
>  2. Is it possible to implement this for dev environment? since as far as I 
> know dev environment does not support runtime configuration currently.
>  3. Is it intended behavior that *releases.exs *replaces configuration added 
> with *Application.put_env/4 *with option *persistent: true*?
> 
> 
> 
> 
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