capistrano - NameError:未初始化的常量Net::SSH::KnownHosts::SUPPORTED_TYPE

Question

我正在尝试将我的Rails (3.1.3)应用程序部署到preprod环境。我使用capistrano (2.12.0)和rvm-capistrano (1.2.2)。

当我调用bundle exec cap ssh时，它工作得很好。但是当我调用bundle exec cap deploy时，我得到了以下跟踪：

$ cap deploy
    triggering start callbacks for `deploy'
  * 18:42:19 == Currently executing `multistage:ensure'
*** Defaulting to `preprod'
  * 18:42:19 == Currently executing `preprod'
  * 18:42:19 == Currently executing `deploy'
  * 18:42:19 == Currently executing `deploy:update'
 ** transaction: start
  * 18:42:19 == Currently executing `deploy:update_code'
  * 18:42:19 == Currently executing `deploy:set_previous_revision'
  * executing "cd /rails_apps/com.example.preprod/current; git rev-parse --short HEAD"
    servers: ["preprod.example.com"]
connection failed for: preprod.example.com (NameError: uninitialized constant Net::SSH::KnownHosts::SUPPORTED_TYPE)

当然，example.com是一个占位符，它不是来自于capistrano配置中的错误。

你知道是什么原因造成的吗？

我在Ruby 1.9.3-p194上使用RVM。

谢谢！

Answer 1

从net-ssh 2.5.1恢复到2.4.0似乎暂时解决了这个问题。

Answer 2

我安装了rvm-capistrano gem来解决这个问题：

gem install rvm-capistrano