Rubyonrails Capistrano 在部署时要求输入密码，尽管有 SSH 密钥

我的ssh密钥绝对设置正确，因为在使用ssh时，我从未被提示输入密码.但capistrano在部署cap deploy时仍然要求输入密码.奇怪的是，当我设置cap deploy:setup时，它并没有要求输入密码.如果没有密码提示，这将使部署周期更加顺畅.

具体说明:我正在将Sinatra应用程序部署到Dreamhost共享帐户(使用Passenger).很久以前，我就遵循了一个指导，当时效果很好.从那以后有东西坏了.我使用的是capistrano(2.5.9)和git版本1.6.1.1.这是我的档案:

load 'deploy' if respond_to?(:namespace) # cap2 differentiator

set :user, 'ehsanul'
set :domain, 'jellly.com'

default_run_options[:pty] = true

# the rest should be good
set :repository,  "ehsanul@jellly.com:git/jellly.git"
set :deploy_to, "/home/ehsanul/jellly.com"
set :deploy_via, :remote_cache
set :scm, 'git'
set :branch, 'deploy'
set :git_shallow_clone, 1
set :scm_verbose, true
set :use_sudo, false

server domain, :app, :web

namespace :deploy do
  task :migrate do
    run "cd #{current_path}; /usr/bin/rake migrate environment=production"
  end
  task :restart do
    run "touch #{current_path}/tmp/restart.txt"
  end
end

after "deploy", "deploy:migrate"

下面是当我cap deploy时，直到密码提示时发生的事情的输出:

$ cap deploy
  * executing `deploy'
  * executing `deploy:update'
 ** transaction: start
  * executing `deploy:update_code'
    updating the cached checkout on all servers
    executing locally: "git ls-remote ehsanul@jellly.com:git/jellly.git deploy"
/usr/local/bin/git
  * executing "if [ -d /home/ehsanul/jellly.com/shared/cached-copy ]; then cd /home/ehsanul/jellly.com/shared/cached-copy && git fetch  origin && git reset  --hard ea744c77b0b939d5355ba2dc50ef1ec85f918d66 && git clean  -d -x -f; else git clone  --depth 1 ehsanul@jellly.com:git/jellly.git /home/ehsanul/jellly.com/shared/cached-copy && cd /home/ehsanul/jellly.com/shared/cached-copy && git checkout  -b deploy ea744c77b0b939d5355ba2dc50ef1ec85f918d66; fi"
    servers: ["jellly.com"]
    [jellly.com] executing command
 ** [jellly.com :: out] ehsanul@jellly.com's password:
Password:
 ** [jellly.com :: out]
 ** [jellly.com :: out] remote: Counting objects: 7, done.
remote: Compressing objects: 100% (4/4), done.

什么东西会坏？