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#如何将 Rails 应用程序部署到 VPS 上

如果已经在 VPS 上假设好了 Rails 生产环境，接下来就可以将部署应用程序了。

###需要用到的工具

• capistrano

---

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class Lisp
  def initialize
    @env = { 
      :label => lambda { |(name,val), _| @env[name] = val },
      :quote => lambda { |sexpr, _| sexpr[0] },
      :car   => lambda { |(list), _| list[0] },
      :cdr   => lambda { |(list), _| list.drop 1 },
      :cons  => lambda { |(e,cell), _| [e] + cell },
      :eq    => lambda { |(l,r), _| l == r },
      :if    => lambda { |(cond, thn, els), ctx| eval(cond, ctx) ? eval(thn, ctx) : eval(els, ctx) },

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install CentOS 6

yum update
yum upgrade

check the server time. sync the time to a time server if needed (service 'ntpd')

download and install Postgresql Server v9.1 rpm package:

rpm -Uvh http://yum.pgrpms.org/9.1/redhat/rhel-6-x86_64/pgdg-centos91-9.1-4.noarch.rpm

This should have installed the necessary server package: postgresql91-server.x86_64.

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# simulate template rendering
class Template < Struct.new(:name)
  def render
    puts "#{name}_begin"
    r = "#{name}_begin\n"
    r << yield if block_given?
    puts "#{name}_end\n"
    r << "#{name}_end\n"
  end
end

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#!/usr/bin/ruby1.9

require 'fiber'
require 'benchmark'

class Ring
   attr_reader :id
   attr_accessor :attach 

   def initialize(id)

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class Avatar < ActiveRecord::Base

  attr_accessor :content_type, :original_filename, :image_data
  before_save :decode_base64_image

  has_attached_file :image,
    PAPERCLIP_CONFIG.merge(
    :styles => {
      :thumb => '32x32#',
      :medium => '64x64#',

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# regexps to check if a string is pure chinese
class String
  # 20k chars
  CHINESE_UCS2 = /^(?:
    [\x4e-\x9e][\x00-\xff]
    |\x9f[\x00-\xa5]
    )+$/xn

  # 20k chars
  CHINESE_UTF8 = /^(?: