CentOS安装Ruby，Rails运行环境

RVM是一个命令行工具，可以提供一个便捷的多版本ruby环境的管理和切换

官方网站：https://rvm.io/

RVM安装：

# \curl -sSL https://get.rvm.io | bash -s stable

第一次运行，会出现error，原因是由于证书问题导致，使用-k命令跳过！

# \curl -sSL https://get.rvm.io -k | bash -s stable

执行上述命令后，发现无法下载软件包，执行以下操作：

# echo insecure >> ~/.curlrc

完成上述操作，就可以安装rvm了！

# \curl -sSL https://get.rvm.io | bash -s stable

RVM改用淘宝下载源，提高ruby等软件安装速度

# sed -i 's!ftp.ruby-lang.org/pub/ruby!ruby.taobao.org/mirrors/ruby!' $rvm_path/config/db

Ruby安装：

首先ruby会有必要的套件需要安装，通过yum安装套件

yum install build-essential bison openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev

列出已知的ruby版本

# rvm list known

安装其中的版本

# rvm install 2.0.0

出现下列错误

Error running 'requirements_centos_update_system ruby-2.0.0-p353',
showing last 15 lines of /usr/local/rvm/log/1392712886_ruby-2.0.0-p353/update_system.log
}
-bash: yum-config-manager: command not found
Error installing EPEL, it is required for libyaml-devel,
either there was an error installing EPEL package,
or there was problem checking if libyaml-devel is available / installed.
Requirements installation failed with status: 127.

原因是由于libyaml-devel没有安装，通过yum安装即可

# yum install libyaml-devel

再次运行rvm安装ruby

查看ruby版本

# ruby -v

查看gem版本（安装ruby会自动安装gem）

# gem -v

RubyGem默认源安装慢，可以修改成淘宝的源提升速度

移除原安装源

# gem sources --remove https://rubygems.org/

添加淘宝源

# gem sources -a http://ruby.taobao.org/

查看源的地址

# gem sources -l

安装Ruby on Rails

首先安装SQLite

# gem install sqlite3 --no-ri --no-rdoc

出现错误，错误信息

Fetching: sqlite3-1.3.8.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing sqlite3:
ERROR: Failed to build gem native extension.

/usr/local/rvm/rubies/ruby-2.0.0-p353/bin/ruby extconf.rb
checking for sqlite3.h... no
sqlite3.h is missing. Try 'port install sqlite3 +universal'
or 'yum install sqlite-devel' and check your shared library search path (the
location where your sqlite3 shared library is located).
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

这是由于sqlite-devel没有安装，安装即可

安装rails

# gem install rails --no-ri --no-rdoc

查看rails版本

# rails -v

為了節省安裝時間可不安裝文件檔，這裡加上--no-ri跟--no-rdoc參數。

至此rails开发环境已结束！

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