ruby-on-rails – 当Capistrano3执行mkdir时,许可被拒绝

Capistrano3没有设置use_sudo和default_run_options.我读到无密码sudo更好,所以我做了visudo用户名ALL = NOPASSWD：ALL,但我仍然遇到了同样的错误.

set :application,'appname.com'
set :repo_url,'git@bitbucket.org:user/myapp.git'
set :user,'username' 
set :branch,'master'


set :deploy_to,'/usr/share/nginx/www/appname'
set :keep_releases,5

namespace :deploy do

 desc 'Restart application'
 task :restart do
   on roles(:app),in: :sequence,wait: 5 do
   end
 end

 after :restart,:clear_cache do
   on roles(:web),in: :groups,limit: 3,wait: 10 do
   end
 end

 after :finishing,'deploy:cleanup'

end

有没有人就这个问题给我任何建议？
谢谢您的帮助.