diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
index 8d59a6fcf3c233201775d6508e50bcc1dde85a28..82509f5ef57652933be908170b0f392353b460d3 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
@@ -54,7 +54,7 @@ Rails.application.configure do
   config.log_level = :debug
 
   # Prepend all log lines with the following tags.
-  # config.log_tags = [ :subdomain, :request_id ]
+  config.log_tags = [ :request_id ]
 
   # Use a different logger for distributed setups.
   # require 'syslog/logger'
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index af3a391cc4d79191219f1fa43e1a71ab3f6006a8..7bcfc86d03e329c2b5b217e9d4dff81591501830 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -79,6 +79,24 @@ def restore_default_config
       end
     end
 
+    test "By default logs tags are not set in development" do
+      restore_default_config
+
+      with_rails_env "development" do
+        app 'development'
+        assert Rails.application.config.log_tags.blank?
+      end
+    end
+
+    test "By default logs are tagged with :request_id in production" do
+      restore_default_config
+
+      with_rails_env "production" do
+        app 'production'
+        assert_equal [:request_id], Rails.application.config.log_tags
+      end
+    end
+
     test "lib dir is on LOAD_PATH during config" do
       app_file 'lib/my_logger.rb', <<-RUBY
         require "logger"