rails disable development.log but still log to STDOUT

Question

how can I disable the logging to logs/(env).log but still preserve rails logging to STDOUT? The correct answer works in in a vanilla rails 4 app running the latest stable version of rails, with no modifications of the Gemfile (i.e. no additional dependencies) and does not use /dev/null (only modifications to ruby code). Monkey patching allowed (encouraged?).

if it works in older versions of rails thats great but not required.

Log output should not be altered in any way, e.g:

I, [2015-02-20T07:54:35.257440 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_source.erb (3.0ms)
I, [2015-02-20T07:54:35.257504 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_source.erb (3.0ms)
I, [2015-02-20T07:54:35.261314 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_trace.html.erb (1.3ms)
I, [2015-02-20T07:54:35.261366 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_trace.html.erb (1.3ms)
I, [2015-02-20T07:54:35.270427 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_request_and_response.html.erb (6.4ms)
I, [2015-02-20T07:54:35.270466 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_request_and_response.html.erb (6.4ms)
I, [2015-02-20T07:54:35.273338 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_web_console.html.erb (0.6ms)
I, [2015-02-20T07:54:35.273367 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_web_console.html.erb (0.6ms)
I, [2015-02-20T07:54:35.273420 #64936]  INFO -- :   Rendered /Users/lsu/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/diagnostics.html.erb within rescues/layout (22.8ms)

mikezter · Accepted Answer · 2015-02-20 13:48:33Z

7

To suppress output to log files, set the output stream of the configured logger to nil.

# config/environments/development.rb
Rails.application.configure do
  config.logger = ActiveSupport::Logger.new(nil)
end

rails server will still log to STDOUT, but no log file is created.

answered Feb 20, 2015 at 13:48

mikezter

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1 Comment

Attenzione Over a year ago

Logger.new(nil) will disable DEPRECATION WARNINGS by Rails. Pass STDOUT instead of nil to show it in the console.

vee · Accepted Answer · 2015-02-19 21:06:23Z

2

You would add the following to your config/environments/development.rb file:

# config/environments/development.rb
ExampleApp::Application.configure do 
  ...
  config.logger = Logger.new(STDOUT)
  config.log_formatter = Logger::SimpleFormatter.new
  ...
end

7 Comments

quinn Over a year ago

this solution prepends the log output with a bunch of stuff like "I, [2015-02-19T10:46:22.566771 #73657] INFO -- :".. updated question with clarification

vee Over a year ago

So, what is your expected output. Can you include an example in your question?

quinn Over a year ago

the expectation is that the log output is unaltered, the desired solution would simply disable the logging to the file (wherever that may be inside of rails) and simply leave the existing log to STDOUT as-is

vee Over a year ago

I'm pretty sure this does exactly what you are asking for. Did you restart your rails server after making this change? All this line is doing is instead of logging to the default logger, it's outputting to STDOUT.

quinn Over a year ago

did you see my first comment? It prepends the log lines with "metadata" with the timestamp, loglevel, etc...

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