Ruby on rails rake cache:clear说它'；正在删除文件，但不是

在cron和命令提示符下，我运行

bundle exec-rake-cache:clear

，它会记录缓存目录中的所有文件，并且会删除它们，但不会。 文件仍然存在，我可以使用remove命令删除它们。我已经确认它有文件权限。还可能是什么

    About your application's environment
Ruby version              2.1.2 (x86_64-linux)
RubyGems version          2.2.2
Rack version              1.5
Rails version             4.0.9
JavaScript Runtime        Node.js (V8)
Active Record version     4.0.9
Action Pack version       4.0.9
Action Mailer version     4.0.9
Active Support version    4.0.9
Middleware                Airbrake::UserInformer, Rack::Sendfile, ActionDispatch::Static, Rack::Lock, Refraction, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x007ffa821bb0c8>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, Airbrake::Rails::Middleware, ActionDispatch::RemoteIp, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::Migration::CheckPending, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, Rack::Head, Rack::ConditionalGet, Rack::ETag
Application root          /mnt/www/ride/releases/20150519225426
Environment               development
Database adapter          mysql

这是运行cron作业的用户。以下是命令的输出：

RAILS_ENV=production bundle exec rake cache:clear --silent

***** initializing cache clear *****

***** deleting /social *****



***** deleting main cache *****

/var/www/site/tmp/cache/81d0fc6f96d4c6c957a26c932e3f2b471a56bc82.cache
/var/www/site/tmp/cache/1db90a7553f8440babe0f23932a674096184feb2.cache
/var/www/site/tmp/cache/b6d4cb2a18a5599605fec8880fc08d8604cbba07.cache

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我可以作为部署用户登录并复制此行为。执行rake任务会列出文件，但不会删除它们。使用rm命令，我可以成功地删除它们

决议是使用

rake tmp:clear 

rake tmp:clear