why is my rails server logging everything twice?

Question

my rails server seems like it is logging everything twice, not sure what is going on here, what should I do to investigate this ?

Answer 1

In my case this was caused by the rails_12factor gem. This gem adds the rails_stdout_logging gem which sends the logs to standard output. This can be useful in a production environment but not in development when Rails already does it by default.

https://github.com/heroku/rails_12factor#rails-4-logging

The solution is to only add this gem in production:

gem 'rails_12factor', group: :production

Answer 2

I had success with this in development.rb:

config.logger = ActiveSupport::Logger.new('/dev/null')

Answer 3

Have a look at this issue

Try adding the following code to you config/application.rb

   if Rails.env.development?
        # Don't log to STDOUT, by default rails s will handle it
        config.logger = Logger.new('/dev/null')
    else
        # Don't log to file, sending everything to unicorn file.
        config.logger = Logger.new(STDOUT)
    end

Answer 4

Do you have your logger set to anything in either config/application.rb or config/environments/development.rb?

If nothing, try adding this line to config/environments/development.rb:

config.logger = Logger.new('/dev/null')