foreman only shows line with “started with pid #” and nothing else

Question

When I run foreman I get the following:

 > foreman start
 16:47:56 web.1     | started with pid 27122

Only if I stop it (via ctrl-c) it shows me what is missing:

^CSIGINT received
16:49:26 system    | sending SIGTERM to all processes
16:49:26 web.1     | => Booting Thin
16:49:26 web.1     | => Rails 3.0.0 application starting in development on http://0.0.0.0:5000
16:49:26 web.1     | => Call with -d to detach
16:49:26 web.1     | => Ctrl-C to shutdown server
16:49:26 web.1     | >> Thin web server (v1.3.1 codename Triple Espresso)
16:49:26 web.1     | >> Maximum connections set to 1024
16:49:26 web.1     | >> Listening on 0.0.0.0:5000, CTRL+C to stop
16:49:26 web.1     | >> Stopping ...
16:49:26 web.1     | Exiting
16:49:26 web.1     | >> Stopping ...

How do I fix it?

Answer 1

I’ve been able to resolve this issue by 2 different ways:

1. From https://github.com/ddollar/foreman/wiki/Missing-Output:

   If you are not seeing any output from your program, there is a likely chance that it is buffering stdout. Ruby buffers stdout by default. To disable this behavior, add this code as early as possible in your program:

   # ruby
   $stdout.sync = true
   

2. By installing foreman via the heroku toolbelt package

But I still don’t know what’s happening nor why this 2 ways above resolved the issue…