# config/puma/development.rb

# Number of threads to start (min / max)
threads 2,8

# Log files
stdout_redirect 'log/puma.out', 'log/puma.err', true

# config/puma.rb

threads 2,8

--- 
+++ 
@@ -1,3 +1,7 @@
-# config/puma.rb
+# config/puma/development.rb
 
+# Number of threads to start (min / max)
 threads 2,8
+
+# Log files
+stdout_redirect 'log/puma.out', 'log/puma.err', true
Add stdout/stderr redirection of puma in log/puma.out and log/puma.err
