CentOS6.2下面安装RVM+ruby+Rails

(1)RVM官方网站应该是改版过一次，
使用

curl -L https://get.rvm.io | bash -s stable

下载并安装rvm稳定版本。不在使用bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)，切记。
很快安装完rvm后，重新登录一个新的ssh，使用rvm -v检查一下版本即可。

(2)安装一些以来库，编译安装其它软件或者库的时候会用到

yum install zlib zlib-devel sqlite-devel

最后的信息大致如下：

......                                                                                                        30 kB/s | 124 kB     00:04     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : sqlite-devel-3.6.20-1.el6.i686                                                                                            1/2 
  Installing : zlib-devel-1.2.3-27.el6.i686                                                                                              2/2 

Installed:
  sqlite-devel.i686 0:3.6.20-1.el6                                       zlib-devel.i686 0:1.2.3-27.el6                                      

Complete!

(3)强烈推荐安装ruby前，先安装openssl，否则以后要用到ssl的时候可能痛不欲生地要重新安装ruby。

rvm pkg install openssl

安装完成后，有下面的提示信息，如果安装错误，也有提示告示你到哪里查看日志。

[root@localhost config]# rvm pkg install openssl
Fetching openssl-0.9.8t.tar.gz to /usr/local/rvm/archives
Extracting openssl-0.9.8t.tar.gz to /usr/local/rvm/src
Configuring openssl in /usr/local/rvm/src/openssl-0.9.8t.
Compiling openssl in /usr/local/rvm/src/openssl-0.9.8t.
Installing openssl to /usr/local/rvm/usr

不同的操作系统或者用户，安装位置可能不一样。


(4)指定openssl位置来安装ruby
提示有一些库可能需要安装，请根据实际情况决策是否需要yum install一些以来库。

yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison iconv-devel 

可以先安装上面的一些库，再安装ruby

rvm install 1.9.2 --with-openssl-dir=/usr/local/rvm/usr

我看完提示信息后，q推出提示，没有安装其它依赖库，继续安装ruby。

......
Press 'q' to continue.
Fetching yaml-0.1.4.tar.gz to /usr/local/rvm/archives
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  460k  100  460k    0     0  29602      0  0:00:15  0:00:15 --:--:-- 34256
Extracting yaml-0.1.4.tar.gz to /usr/local/rvm/src
Configuring yaml in /usr/local/rvm/src/yaml-0.1.4.
Compiling yaml in /usr/local/rvm/src/yaml-0.1.4.
Installing yaml to /usr/local/rvm/usr
Installing Ruby from source to: /usr/local/rvm/rubies/ruby-1.9.2-p320, this may take a while depending on your cpu(s)...

ruby-1.9.2-p320 - #fetching 
ruby-1.9.2-p320 - #downloading ruby-1.9.2-p320, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 8770k  100 8770k    0     0  44230      0  0:03:23  0:03:23 --:--:-- 55436
ruby-1.9.2-p320 - #extracting ruby-1.9.2-p320 to /usr/local/rvm/src/ruby-1.9.2-p320
ruby-1.9.2-p320 - #extracted to /usr/local/rvm/src/ruby-1.9.2-p320
ruby-1.9.2-p320 - #configuring 
ruby-1.9.2-p320 - #compiling 
ruby-1.9.2-p320 - #installing 
Retrieving rubygems-1.8.24
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  371k  100  371k    0     0  38121      0  0:00:09  0:00:09 --:--:-- 38064
Extracting rubygems-1.8.24 ...
Removing old Rubygems files...
Installing rubygems-1.8.24 for ruby-1.9.2-p320 ...
Installation of rubygems completed successfully.
ruby-1.9.2-p320 - adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.9.2-p320 - #importing default gemsets (/usr/local/rvm/gemsets/)
Install of ruby-1.9.2-p320 - #complete 

(5) rvm use 1.9.2

(6) gem install rails

Fetching: i18n-0.6.0.gem (100%)
Fetching: multi_json-1.3.6.gem (100%)
Fetching: activesupport-3.2.6.gem (100%)
Fetching: builder-3.0.0.gem (100%)
Fetching: activemodel-3.2.6.gem (100%)
Fetching: rack-1.4.1.gem (100%)
Fetching: rack-cache-1.2.gem (100%)
Fetching: rack-test-0.6.1.gem (100%)
Fetching: journey-1.0.4.gem (100%)
Fetching: hike-1.2.1.gem (100%)
Fetching: tilt-1.3.3.gem (100%)
Fetching: sprockets-2.1.3.gem (100%)
Fetching: erubis-2.7.0.gem (100%)
Fetching: actionpack-3.2.6.gem (100%)
Fetching: arel-3.0.2.gem (100%)
Fetching: tzinfo-0.3.33.gem (100%)
Fetching: activerecord-3.2.6.gem (100%)
Fetching: activeresource-3.2.6.gem (100%)
Fetching: mime-types-1.19.gem (100%)
Fetching: polyglot-0.3.3.gem (100%)
Fetching: treetop-1.4.10.gem (100%)
Fetching: mail-2.4.4.gem (100%)
Fetching: actionmailer-3.2.6.gem (100%)
Fetching: rack-ssl-1.3.2.gem (100%)
Fetching: thor-0.15.4.gem (100%)
Fetching: json-1.7.3.gem (100%)
Building native extensions.  This could take a while...
Fetching: rdoc-3.12.gem (100%)
......

至此安装完毕，后面再来验证吧。