在ubuntu 8.10 上安装passenger 2.0.6

按照http://www.rubyenterpriseedition.com/download.html#ubuntu上的说明，在ubuntu8.10上安装passenger时报以下错误：
Welcome to the Phusion Passenger Apache 2 module installer, v2.0.6.

This installer will guide you through the entire installation process. It
shouldn't take more than 3 minutes in total.

Here's what you can expect from the installation process:

1. The Apache 2 module will be installed for you.
2. You'll learn how to configure Apache.
3. You'll learn how to deploy a Ruby on Rails application.

Don't worry if anything goes wrong. This installer will advise you on how to
solve any problems.

Press Enter to continue, or Ctrl-C to abort.

Checking for required software...

* GNU C++ compiler... found at /usr/bin/g++
* Ruby development headers... found
* OpenSSL support for Ruby... found
* RubyGems... found
* Rake... found at /opt/ruby-enterprise/bin/rake
* Apache 2... found at /usr/sbin/apache2
* Apache 2 development headers... found at /usr/bin/apxs2
* Apache Portable Runtime (APR) development headers... found at /usr/bin/apr-1-config
* Apache Portable Runtime Utility (APR) development headers... found at /usr/bin/apu-1-config
* fastthread... found
* rack... found
--------------------------------------------

--------------------------------------------
Compiling and installing Apache 2 module...
cd /opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-2.0.6
/opt/ruby-enterprise/bin/ruby -S rake clean apache2
/usr/bin/rake:27:in `require': no such file to load -- rake (LoadError)
from /usr/bin/rake:27

--------------------------------------------
It looks like something went wrong

Please read our Users guide for troubleshooting tips:

/opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-2.0.6/doc/Users guide.html

If that doesn't help, please use our support facilities at:

http://www.modrails.com/

We'll do our best to help you.

在/usr/bin/rake文件的27行前加上一句:
require 'rubygems'
重新运行passenger命令就可以正确安装上。
ubuntu 8.10中原来已经安装了ruby 1.8.7，与ruby-enterprise中的ruby版本不一样，需要在用户根目录下的.bashrc文件中调整一下PATH：
export PATH=/opt/ruby-enterprise/bin:$PATH

另外系统中sudo没有gem命令，需要加个软链接，这样才能用sudo安装gem包：
$> sudo ln -s /opt/ruby-enterprise/bin/gem /usr/bin/gem
(不要用sudo apt-get install rubygems 安装)

之后再生成二个文件:
$> sudo vi /etc/apache2/conf.d/rails
LoadModule passenger_module /opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-2.0.6/ext/apache2/mod_passenger.so
PassengerRoot /opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-2.0.6
PassengerRuby /opt/ruby-enterprise/bin/ruby
RailsEnv development
RailsDefaultUser test

$> sudo vi /etc/apache2/sites-enabled/rails_app
<VirtualHost *:80>
ServerName www.yourhost.com
DocumentRoot /somewhere/public
</VirtualHost>

重启apache2之后访问www.yourhost.com.