安装gcc编译器和make程序

yum install gcc gcc-c++ make -y

安装ruby和gems

yum install ruby ruby-devel rubygems ruby-irb ruby-ri -y

更新gem

gem update –system

安装rails

gem install rails

检查ruby、gem和rails的状态

[root@localhost ~]# gem -v
2.0.0
[root@localhost ~]# rails -v
Rails 3.2.12
[root@localhost ~]# ruby -v
ruby 1.8.7 (2011-06-30 patchlevel 352) [i386-linux]
[root@localhost ~]#
[root@localhost ~]# gem list
*** LOCAL GEMS ***
actionmailer (3.2.12)
actionpack (3.2.12)

如果缺少安装相关软件，安装过程可能会遇到下面这两个错误：

Error1 :
Building native extensions. This could take a while…
/usr/bin/ruby extconf.rb
mkmf.rb can’t find header files for ruby at /usr/lib/ruby/ruby.h
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
 Building has failed. See above output for more information on the failure.
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/json-1.7.7 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/json-1.7.7/ext/json/ext/generator/gem_make.out
[root@localhost ~]#

Error 2:
Building native extensions. This could take a while…
/usr/bin/ruby extconf.rb
creating Makefile
make
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
 Building has failed. See above output for more information on the failure.
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/json-1.7.7 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/json-1.7.7/ext/json/ext/generator/gem_make.out
[root@localhost ~]#