How to set environment variables for my app

Questions / Help
1

I have some environment variables that I’m using in my app AUTH0_DOMAIN and AUTH0_AUDIENCE which are consumed in my phoenix app’s config/config.exs file, like so.

config :auth0_jwks, iss: System.get_env("AUTH0_DOMAIN"),
  aud: System.get_env("AUTH0_AUDIENCE")

The question is how can I simply set those environment variables for my app? Heres what I’ve tried so far with zero success.

  • Setting the env vars in the --env argument when deploying the application.
  • Setting the env vars under the [env] config in the fly.toml.
  • Setting the env vars in an .env file which isn’t ignored my the dockerignore file.

I’m possibly missing something fundamental but I can’t see it at the moment, does anyone have any ideas of what I might be missing?

2

If you ssh into the machine and do ‘env’ in the terminal, can you see those variables?

3

➜ app git:(main) ✗ fly ssh console -C “printenv”
Connecting to fdaa:2:7f9d:a7b:13e:440a:5618:2… complete
AUTH0_AUDIENCE=https://xxx-sunset-733.fly.dev
AUTH0_DOMAIN=https://xxx.eu.auth0.com/

so they do exist but the app errors as if they are not set.

4

Can we look into the app errors?

5

So this is the error which happens when the app is starting (deploying) so this is what happens when I try and deploy using System.get_env/1 to accesss the environment variables in the config - I can only see the env vars with printenv if I statically set those values and then deploy.

This error happens locally for me too when those environments arn’t set for example when running iex -S mix phx.server without those envs set - which is why I’m thinking those envs arn’t set because its the same error.

2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]    ** (EXIT) an exception was raised:
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]        ** (Auth0Jwks.Config.MissingValueError) Auth0 config [:auth0_jwks, :iss] is not set
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (auth0_jwks 0.2.0) lib/config.ex:9: Auth0Jwks.Config.get_config_or_error/2
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (auth0_jwks 0.2.0) lib/config.ex:28: Auth0Jwks.Config.jwks_url/0
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (auth0_jwks 0.2.0) lib/strategy.ex:3: Auth0Jwks.Strategy.init_opts/1
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (auth0_jwks 0.2.0) lib/strategy.ex:2: Auth0Jwks.Strategy.start_link/1
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (stdlib 5.0.2) supervisor.erl:420: :supervisor.do_start_child_i/3
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (stdlib 5.0.2) supervisor.erl:406: :supervisor.do_start_child/2
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (stdlib 5.0.2) supervisor.erl:390: anonymous fn/3 in :supervisor.start_children/2
2023-09-02T16:45:48Z app[2874365a619dd8] lhr [info]            (stdlib 5.0.2) supervisor.erl:1256: :supervisor.children_map/4
2023-09-02T16:45:49Z app[2874365a619dd8] lhr [info] WARN Reaped child process with pid: 314 and signal: SIGUSR1, core dumped? false
2023-09-02T16:45:49Z app[2874365a619dd8] lhr [info] WARN Reaped child process with pid: 316 and signal: SIGUSR1, core dumped? false
2023-09-02T16:45:50Z app[2874365a619dd8] lhr [info]Kernel pid terminated (application_controller) ({application_start_failure,rock_map,{{shutdown,{failed_to_start_child,'Elixir.Auth0Jwks.Strategy',{'EXIT',{#{message => <<"Auth0 config [:auth0_jwks, :iss] is not set">>,'__struct__' => 'Elixir.Auth0Jwks.Config.MissingValueError','__exception__' => true},[{'Elixir.Auth0Jwks.Config',get_config_or_error,2,[{file,"lib/config.ex"},{line,9}]},{'Elixir.Auth0Jwks.Config',jwks_url,0,[{file,"lib/config.ex"},{line,28}]},{'Elixir.Auth0Jwks.Strategy',init_opts,1,[{file,"lib/strategy.ex"},{line,3}]},{'Elixir.Auth0Jwks.Strategy',start_link,1,[{file,"lib/strategy.ex"},{line,2}]},{supervisor,do_start_child_i,3,[{file,"supervisor.erl"},{line,420}]},{supervisor,do_start_child,2,[{file,"supervisor.erl"},{line,406}]},{supervisor,'-start_children/2-fun-0-',3,[{file,"supervisor.erl"},{line,390}]},{supervisor,children_map,4,[{file,"supervisor.erl"},{line,1256}]}]}}}},{'Elixir.RockMap.Application',start,[normal,[]]}}})
6

Is this exception raised during fly deploy?

7

Correct, this exception happens when I run fly deploy (which I run also with --remote-only).

8

Can you try --build-arg instead of --env?

9

Sadly I still get the same error.

fly deploy --remote-only --build-arg AUTH0_DOMAIN="https://xxx.eu.auth0.com/" --build-arg AUTH0_AUDIENCE="https://xxx-sunset-733.fly.dev"
10

I will work on a reproduction
and see what I learn until a Fly.io employee gets to this.

1 Like
11

Okay I’ve fixed the issue by moving the config from config.exs to runtime.exs.

1 Like
13

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.