Phusion white papers Phusion overview

Phusion Blog

Phusion Passenger 4.0.3 released

By Hongli Lai on May 24th, 2013

Phusion Passenger is software that deploys Ruby and Python web apps, by integrating into Apache and Nginx and turning them into a fully-featured application server. It is very fast, stable and robust and thus used by the likes of New York Times, AirBnB, Symantec, Pixar, etc. It comes with many features that makes your life easier and your application perform better.

Phusion Passenger is under constant maintenance and development. Version 4.0.3 is a bugfix release.

Phusion Passenger also has an Enterprise version which comes with a wide array of additional features. By buying Phusion Passenger Enterprise you will directly sponsor the development of the open source version.

Recent changes

  • Better protection is now provided against application processes that
    are stuck and refuse to shut down cleanly. Since version 4.0.0,
    Phusion Passenger already forcefully shuts down all processes during
    web server shutdown.
    In addition to this, 4.0.3 now also forcefully
    shuts down processes that take more than 1 minute to shut down, even
    outside the context of web server shutdowns. This feature does not,
    however, protect against requests that take too long. Use
    PassengerMaxRequestTime (Apache) or passenger_max_request_time (Nginx)
    for that.
  • Fixed a crash in the HelperAgent which results in frequent process
    restarts in some traffic patterns. Fixes issue #862.
  • Fixed a problem that prevents processes from being spawned correctly
    if the user’s bashrc changes working directory. Fixes issue #851.
  • passenger-status now also displays CPU usage.
  • The installer now checks for checksums when automatically downloading
    PCRE and Nginx. Contributed by Joshua Lund.
  • An error is now printed when trying to daemonize Phusion Passenger
    Standalone on Ruby implementations that don’t support forking.
    Contributed by Benjamin Fleischer.
  • Although Phusion Passenger already supported JRuby, installing
    Phusion Passenger with JRuby was not possible. This has been fixed.
  • Various other minor bug fixes.

Installing 4.0.3

Quick install/upgrade

Phusion Passenger Enterprise users can download the Enterprise version of 4.0.3 from the Customer Area.

Open source users can install the open source version of 4.0.3 with the following commands:

gem install passenger

You can also download the tarball at Google Code. We strongly encourage you to cryptographically verify files after downloading them.

In-depth instructions

In-depth installation and upgrade instructions can be found in the Installation section of the documentation. The documentation covers:

  • Detailed tarball installation instructions.
  • Detailed upgrade instructions.
  • Installation troubleshooting.
  • Installation through APT and YUM.

You can view the documentation online here:


If you would like to stay up to date with Phusion news, please fill in your name and email address below and sign up for our newsletter. We won’t spam you, we promise.