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

问题描述

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

I'm trying to deploy my Rails (3.1.3) application to the preprod env.I use capistrano (2.12.0) and rvm-capistrano (1.2.2).

当我呼叫 bundle exec cap ssh时可以正常工作。
但是当我调用 bundle exec cap deploy 时，会得到以下跟踪：

When I call bundle exec cap ssh it works fine.But when I call bundle exec cap deploy I get the following trace:

$ 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capistrano配置中的错误。

Of course example.com is a placeholder, it doesn't come from a mistake in the capistrano config.

任何可能导致这种情况的想法吗？

Any idea of what could cause that ?

我正在将RVM与Ruby 1.9.3-p194一起使用。

I'm using RVM with Ruby 1.9.3-p194.

谢谢！

推荐答案

从net-ssh 2.5.1还原到2.4.0似乎可以解决以下问题：现在。

Reverting back from net-ssh 2.5.1 to 2.4.0 seems to solve the problem for now.

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