Having Trouble using my Rails Application to Fly.io

Questions / Help
1

I have deploy my Rails application on Fly.io with success, everithing work fine except one thing. when i recond one product i have this error on my error monioring

ArgumentError: key must be 32 bytes

happend on this file (Gem)

[GEM_ROOT]/gems/activesupport-7.0.4/lib/active_support/message_encryptor.rb:172:in `key='
cipher = new_cipher
cipher.encrypt
cipher.key = @secret

Everithing work fine on local, but on Fly.io i have this error.
Please, i don’t know what happend

thanks

Using Ruby “3.1.2” and Rails 7.0.4

2

It looks like your RAILS_MASTER_KEY is not set correctly. This key is typically in config/master.key, but may be in config/credentials/production.key.

That value should be 32 hexadecimal characters. Run the following command:

fly secrets set RAILS_MASTER_KEY=61f544e7e5560326b7d0933e71c9ad08

… replacing the 32 hex characters in the line above with the value from your master key.

3

Hey folks,
I am having the same issues. Just trying out fly deploy

All env variables are set

RAILS_MASTER_KEY=<16 bytes>

Same is in the credentials.

  bin/rails aborted!
  ArgumentError: key must be 16 bytes (ArgumentError)
          cipher.key = @secret
                       ^^^^^^^
  /app/config/environment.rb:8:in `<main>'
  /app/bin/rails:6:in `<main>'

I am able to run the build locally, tho.

4

Ok super accidental but this is what worked for me

bin/rails credentials:edit

You save your 16 byte string there.

then cat config/master.key copy its value into fly secrets set RAILS_MASTER_KEY=<your key from master.key>