$gem install capistrano
$cap -V         --检查安装是否正确
$cap -T         --查看capistrano 命令 ##让你的rails app 使用git hub,可以注册一个github帐号，具体的github安装配置参考[利用Github管理Rails代码][1]。

$cap .            -- 生成Capfile & config/deploy.rb
$cap deploy:setup   --生成release/shared目录
$cap deploy:check   --检查capistrano 所需要的环境是否满足 ##修改config/deploy.rb文件，下面是everyday的例子：

set :application, "everyday"
set :repository,  "git@github.com:tim-tang/everyday.git"
set :branch, "master"
set :deploy_via, :remote_cache
set :scm, :git
set :scm_username, "tang.jilong@139.com"   
set :scm_passphrase, "*****"
set :use_sudo,   false 
set :deploy_to,   "/home/tim-tang/Documents/#{application}"
set :user, "root"
set :password, "*****"
ssh_options[:forward_agent] = true
server "192.168.1.104", :app, :web, :db, :primary => true
namespace :deploy do
  task :start, :roles => :app, do  
    invoke_command "/home/tim-tang/nginx/sbin/nginx"
  end
  task :stop, :roles => :app,  do 
    invoke_command "/home/tim-tang/nginx/sbin/nginx -s stop"
  end
  task :restart, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
    invoke_command "/home/tim-tang/nginx/sbin/nginx -s stop"
    invoke_command "/home/tim-tang/nginx/sbin/nginx"
  end
end ##还需要修改下nginx的配置，~/nginx/conf/nginx.conf

......
root /home/tim-tang/Documents/everyday/current/public;  --将原来的部署目录指到current下面。
......

$cap deploy:cold  ---冷部署第一次使用
$cap deploy   ---- 以后每次可以用