ruby-on-rails – 与bitbucket存储库一起使用capistrano部署rail

The authenticity of host ‘github.com (some_ip_address)’ can’t be established.

这是我的部署文件.部署：设置和部署：检查工作正常.

require "bundler/capistrano" 
require "rvm/capistrano"

default_run_options[:pty] = true 
ssh_options[:forward_agent] = true

set :repository,'ssh://git@bitbucket.org/username/repo.git' 
set :scm :git 
set :scm_verbose,true
set :user,'root'
set :deploy_via,:remote_cache
set :migrate_target,:current
set :branch,'master'
set :application,'my_app_name' 
set :domain,'my_domain_ip_address'
set :applicationdir,"/home/deploy/domains/#{application}"
set :deploy_to,"/home/deploy/domains/#{application}"
role :web,domain role :app,domain role :db,domain,:primary => true
set :keep_releases,5
set :rvm_type,:system

after 'deploy:restart','deploy:cleanup'

namespace :deploy do   
  task :start do ; end   
  task :stop do ; end   
  task :restart,:roles => :app,:except => { :no_release => true } do
    run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
    run "#{try_sudo} chmod 777 #{File.join(current_path,'tmp/')}"
    run "#{try_sudo} chmod 777 #{File.join(current_path,'log/')}"
  end
  task :after_deploy do
    run "cd #{current_path} && bundle install --deployment"
    run "cd #{current_path}; RAILS_ENV=#{rails_env} bundle exec rake db:migrate"
    run "#{try_sudo} chmod 777 -R #{current_path}/tmp/"
    run "#{try_sudo} chmod 777 -R #{current_path}/log/"
    run "#{try_sudo} chmod 777 . #{current_path}/log/"   
  end 
end

after 'deploy','deploy:after_deploy'

注意：我是第一次尝试部署rails app.

服务器：Digital Ocean VPS

存储库：bitbucket.org

我在bitbucket帐户中添加了服务器的ssh密钥.

问题：’cap：deploy’,执行部署后,部署：更新,部署：update_code,deploy：finalize_update,deploy：assets：symlink,

在执行’bundle install’时出现问题,它正在使用github真实性,而我正在使用bitbucket.