大佬教程收集整理的这篇文章主要介绍了ruby-on-rails – capistrano – NameError：未初始化的常量Net :: SSH :: KnownHosts :: SUPPORTED_TYPE，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
当我调用bundle exec ssh它工作正常.
但是当我调用bundle exec cap部署时,我得到以下跟踪：
$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是占位符,它不是来自于capistrano配置中的错误.
有什么可能导致的想法？
我使用Ruby 1.9.3-p194的RVm.
谢谢 ！
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