使用Rails啟動WEBrick服務器時出錯

Question

我有一個已經准備好數據庫的現有應用程序，我已經在database.yml中進行了所有更改，並在嘗試使用Rails啟動WEBrick服務器時進行了捆綁安裝，但出現以下錯誤

/usr/lib/ruby/1.9.1/fileutils.rb:247:in `mkdir': File exists - /home/username/appname/app/releases/20120831125545/tmp (Errno::EEXIST)
from /usr/lib/ruby/1.9.1/fileutils.rb:247:in `fu_mkdir'
from /usr/lib/ruby/1.9.1/fileutils.rb:221:in `block (2 levels) in mkdir_p'
from /usr/lib/ruby/1.9.1/fileutils.rb:219:in `reverse_each'
from /usr/lib/ruby/1.9.1/fileutils.rb:219:in `block in mkdir_p'
from /usr/lib/ruby/1.9.1/fileutils.rb:205:in `each'
from /usr/lib/ruby/1.9.1/fileutils.rb:205:in `mkdir_p'
from /home/username/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.10/lib/rails/commands/server.rb:62:in `block in start'
from /home/username/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.10/lib/rails/commands/server.rb:61:in `each'
from /home/username/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.10/lib/rails/commands/server.rb:61:in `start'
from /home/username/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.10/lib/rails/commands.rb:30:in `block in <top (required)>'
from /home/username/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.10/lib/rails/commands.rb:27:in `tap'
from /home/username/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.10/lib/rails/commands.rb:27:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'

我是否缺少某些步驟，是否需要重新運行遷移（數據庫已經准備好，其中包含數據）有什么幫助嗎？

Answer 1

顯然，Rails用於會話存儲的tmp目錄已經存在。 嘗試刪除發行目錄中的/ tmp文件夾。