capistrano部署错误-新手

Question

我是ruby新手，目前在部署capistrano时遇到问题。在我得到的错误下面。

cap aborted!
Operation timed out - connect(2)
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/net-ssh-2.7.0/lib/net/ssh/transport/session.rb:67:in `initialize'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/net-ssh-2.7.0/lib/net/ssh/transport/session.rb:67:in `open'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/net-ssh-2.7.0/lib/net/ssh/transport/session.rb:67:in `block in initialize'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/net-ssh-2.7.0/lib/net/ssh/transport/session.rb:67:in `initialize'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/net-ssh-2.7.0/lib/net/ssh.rb:200:in `new'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/net-ssh-2.7.0/lib/net/ssh.rb:200:in `start'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:156:in `ssh'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:109:in `block in _execute'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:106:in `tap'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:106:in `_execute'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:54:in `execute'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/abstract.rb:75:in `within'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/capistrano-3.0.0/lib/capistrano/tasks/git.rake:44:in `block (3 levels) in <top (required)>'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:42:in `instance_exec'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/backends/netssh.rb:42:in `run'
/Users/stefydu/.rvm/gems/ruby-2.0.0-p247/gems/sshkit-1.0.0/lib/sshkit/runners/parallel.rb:12:in `block (2 levels) in execute'
Tasks: TOP => git:create_release => git:update
(See full trace by running task with --trace)

Answer 1

这不是一个解决方案，而是一个解决方法的解释：

Capistrano 3和它的sshkit不重用现有的SSH连接，而是为每个任务启动一个新的连接(参见https://github.com/capistrano/sshkit/issues/34)。

一些服务器，各自的防火墙，似乎阻止新的连接请求，如果它们变得很快或如果有太多的开放连接。

解决方案：

• 修复SSHKit/Capistrano重用您的服务器/防火墙以允许大量并行ssh会话(对于一个简单的rails应用程序，大约15个)
• 使用下面的
• (免责声明:不，不要使用它)：

我们将扩展(monkeypatch) gems/sshkit-1.1.0/lib/sshkit/backends/netssh.rb.中的execute方法这可以通过Capfile完成：

# Overwrite execute method to avoid timeouts
class SSHKit::Backend::Netssh
  def execute(*args)
    _execute(*args).success?
  rescue Errno::ETIMEDOUT
    @tries ||= 0
    raise "Nope, no way" if @tries > 5
    puts "Timeout. yeah. Try it again (#{@tries})" 
    sleep 5
    @tries += 1
    execute(*args)
    end
end

这给了服务器一个呼吸的机会...

Answer 2

Capistrano现在使用SSH的连接池：https://github.com/capistrano/sshkit/pull/70