[erlang-questions] reload application configuration

Pierre Fenoll <>
Tue Nov 19 11:06:11 CET 2013


Hi,
Why not use functions defined in a conf module? Combined with hot code swapping that should do, shouldn't it?

Ah, maybe not with releases...

> On 11 nov. 2013, at 14:18, Benoit Chesneau <> wrote:
> 
> Hi all,
> 
> Until now I was using either an ini file (using http://github.com/benoitc/econfig)  to handle the config on my app. Econfig allows me to reload the config and update it in live relatively easily .
> 
> But INI is a rather limited format and I don't really want to use something YAML or TOML. Instead I was thinking to use pur application config and maybe cuttlefish (https://github.com/basho/cuttlefish) . But I wonder how to change the config in live. Say for example having a an HTTP config handler that allows the user to change some  settings, triggering the config changes in the applications and writing them on the disk. Is there a way to do that?
> 
> 
> I found an old mail that was suggestiing to use `application_controller:change_application_data` like this
> 
> 
> reload_config(AppNames, ConfigFile) -> 
>      {ok, [Config]} = file:consult(ConfigFile), 
>      Apps = [{application, A, element(2,application:get_all_key(A))} 
>              || {A,_,_} <- application:while_applications()], 
>      application_controller:change_application_data(Apps,Config). 
> 
> 
> http://erlang.2086793.n4.nabble.com/Loading-application-variables-td2089610.html
> 
> though `application_controller:change_application_data` is not public. Should I update the config using `application:set_env` instead? Any other way?
> 
> - benoit
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> 
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